chemistry assignment answer 2021

Chemistry Assignment Class 9 Answer & Solution 2021

May 24, 2021 bdexam-aid Assignment , dshe.gov.bd assignment 0

Chemistry Assignment Class 9 Answer 4th week 2021 has been uploaded in our website immediately after the publication of 4th week assignment by DSHE. Students of Class 9 are recently working with their chemistry Assignment. According to the assignment syllabus given by DSHE, we have given Chemistry Assignment Class 9 Answer sample. After viewing this sample Chemistry assignment, you can prepare your own. In our website, we have described in full length about Chemistry Assignment Class 9 Answer. Read this post carefully from the beginning .

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Chemistry Assignment Class 9 Answer

Chemistry Assignment Solution

According to the Google search records, we come to know that students all over the country are searching for Chemistry Assignment solutions. That is why we are going to show you a sample chemistry assignment solution. By seeing the solution, you may grow ability to prepare your own assignment too. As a matter of fact, preparing assignment for the first time is not at all easy. Therefore, we have come to help you prepare your assignment effectively. The purpose of this post is purely instructive. Let us see Chemistry Assignment Class 9 Answer & Solution.

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Class 9 Chemistry Assignment 2021 Topics

Directorate of Secondary and Higher Education published assignment syllabus on the first of November. Immediately after the authority published the syllabus we have given it in our website. You see see the syllabus and assignments plan at dshe.gov.bd 2020 Syllabus. As chemistry subject, the authority has announced several questions for class 9. Let us just cite those questions so that we may give you a sample answer.

As Chemistry assignment topics the authority has published some topics. The firs week chemistry assignment class 9 includes first three chapters. And, the first chemistry assignment topic is the separation of Salt from sands. The class 9 students have to prepare an assignment on the topics. To put it clearly, the students have to show how to separate salt from the sand in practical way. If we put that in Bangla it goes like this : ( হাতে কলমে লবণ ও বালির মিশ্রণ পৃথক করে দেখতে হবে ).

dshe.gov.bd Syllabus 2020 PDF | NCTB Short Syllabus 2020

Chemistry Assignment Question Solution

It is not very difficult to prepare assignment on this topics. But before going to prepare your assignment you need to know about the experiment. After that, you can start preparing your assignment following our instructions. Earlier, we have described how you would prepare an effective assignment. For making an effective assignment, we recommend you to see our post related to DSHE Assignments.

Apart from that, we have showed you how you will design assignment cover page. Further, we have given you assignment front page sample. By showing the assignment sample you can design one for you. But for now, we are doing Chemistry Assignment Class 9 Answer. You can have a look at the following answer.

dshe.gov.bd Assignment Cover Page Design

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Class 9 Chemistry Assignment PDF

For your convenience, we have uploaded the chemistry assignment class 9 answer PDF. You can download Chemistry Assignment Answer for your offline use. Have a look below to download the Chemistry Assignment Class 9 Answer PDF file.

Download Chemistry Assignment Class 9 Answer PDF

Effective Assignment Writing for Class 9

When you write your practical notebooks for your examination, you have to do some steps. For example, when you do chemistry practical, you need to know the experiment. For doing an assignment, you have to change the layout of working. First of all, you have to write down the topic name at the top. Then you have to write an introduction what are you going to write. Further, you have to write about the experiment apparatuses you need. After that, you have to write about steps of experiment. In the ending, you have to write your conclusion or statement. That is all.

Have a good luck. For improving your assignment, you can follow our website . Because we are working with high school assignment nowadays. Moreover, we have a long experience of preparing good assignment. So, you have in your hands Chemistry Assignment Class 9 Answer now.

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Class 9 Chemistry Assignment Answer 2021 (7th week)

Class Nine Chemistry assignment answer 2021. 7th Week Class 9 assignment answer 2021 is available on our website. Our website publishes class 9 assignment answers every week. In this post, we will specifically give only class 9 Chemistry assignment answer. This post is for those who are looking for class nine Chemistry assignment answer 2021.

Class 9 Chemistry Assignment Answer 2021

Chemistry is a group-based subject of class 9. It can also be called a group-based compulsory subject. Because taking this subject is mandatory. You will get the Chemistry assignment solution in this post. The assignment solution will be accurate. Because the assignment solution that is offered on our website is solved by an experienced person. So students who are a little weak in Chemistry can take help from our website.

Students who are weak in Chemistry should spend a little more time on this subject. Because this subject is not too difficult. This subject will seem much easier to the students if they give a little more time on this subject.

7th Week Class Nine Chemistry Assignment 2021

Every week, the Directorate of Secondary and Higher Education (DSHE) publishes assignments of various subjects of class nine. The Chemistry Assignment was published on seventh week.

Read More: Download Class 9-10 Chemistry Book PDF

Class 9 Chemistry Assignment Answer 7th week

7th week’s Chemistry assignment answer is available on our website. Similarly, the next-week assignment solution will be published on our website. 7th week class nine Chemistry assignment answer 2021 has given here.

খাদ্য লবন ও বালির মিশ্রণ হতে এর উপাদানসমূহ পৃথক করা যায় এ পরীক্ষণের দুইটি পদ্ধতি ব্যবহার করা হয়েছে যথাক্রমে পরিস্রাবণ ও বাষ্পীভবন।

শিরােনামঃ বালু মিশ্রিত খাবার লবণকে খাবার উপযােগী করা সম্ভব।

তত্ত্বঃ বালু মিশ্রিত লবণে পানি যােগ করা হলে লবণ পানিতে দ্রবীভূত হয়ে যায়, কিন্তু বালু দ্রবীভূত হয় না। পরিস্রাবণ ও বাষ্পীকরণ এর সাহায্যে লবণ ও বালুকে পৃথক করা যায়।

পরীক্ষণটি করার জন্য প্রয়ােজনীয় যন্ত্রপাতিঃ বিকার ২ টি, ফানেল ১টি, ফিল্টার পেপার, কাচদণ্ড ১টি, ত্রিপদীস্ট্যান্ড, তারজালি, স্পিরিট ল্যাম্প, টেস্টটিউব ১টি, বেসিন।

রাসায়নিক দ্রব্যঃ লবণ ও সিলভার নাইট্রেট (AgNO2) দ্রবণ।

কার্যপদ্ধতিঃ

(১) একটি কাচের বিকারে বালু মিশ্রিত লবণ নিয়ে তাতে অল্প পানি যােগ করে কাচদন্ড দিয়ে নাড়ি। ফলে লবণ পানিতে দ্রবীভূত হয়ে যাবে। কিন্তু বালু পানিতে দ্রবীভূত হবে না।

(২) একটি ফিল্টার পেপার পানিতে সামান্য ভিজিয়ে নিয়ে ফানেলের মধ্যে যথাযথভাবে স্থাপন করি।

(৩) ফানেলটিকে ২য় বিকারে স্থাপন করি।

(৪) ১ম বিকার থেকে বালু মিশ্রিত লবণের দ্রবণ অল্প অল্প করে ফানেলের মধ্যে ঢালি। ফলে ফিল্টার পেপার দিয়ে পরিস্রাবণের মাধ্যমে লবণ মিশ্রিত পানি ফোটায় ফোটায় ২য় বিকারে পড়তে থাকবে।

(৫) সম্পূর্ণ দ্রবণ পরিস্রবণ হয়ে গেলে ফানেলটিকে ২য় বিকার থেকে সরিয়ে নিই এবং ফিল্টার পেপার থেকে সামান্য পাতিত পানি দ্বারা বালু ধৌত করে আলাদা করে নিই।

(৬) ফিল্টার পেপারের বালুতে লবণ আছে কিনা তা জানার জন্য নিচের ধাপগুলাে অনুসরণ করি।

লবণমুক্ত বালু নিশ্চিতকরণঃ

পরীক্ষা	পর্যবেক্ষন	সিদ্ধান্ত	করনীয়
(১) বালু মিশ্রিত পানি একটি টেস্টটিউবে Agcl এর সাথে অধঃক্ষেপ নিয়ে অল্প AgNO3 দ্রবণ যােগ করি।	এর সাদা অধঃক্ষেপ পড়লাে।	বালুতে লবন আছে।	৪-৫ নং ধাপ অনুসরন করবাে।
(২) বালু মিশ্রিত পানি একটি টেস্টটিউবে Agcl এর ) সাথে অধঃক্ষেপ নিয়ে অল্প। \| AgNO, দ্রবণ যােগ করি।	এর সাদা অধঃক্ষেপ পড়লাে।	বালুতে অল্প লবন আছে।
(৩) বালু মিশ্রিত পানি = = একটি টেস্টটিউবে Agcl এর সাথে অধঃক্ষেপ নিয়ে। অল্প AgNO, দ্রবণ যােগ করি।।	এর সাদা অধঃক্ষেপ পড়লাে না ।	বালুতে লবন নেই।	৪-৫ নং ধাপ অনুসরন করবাে।

(৭) ত্রিপদী স্ট্যান্ডের উপর তারজালি রাখি এবং লবণ মিশ্রিত সম্পূর্ণ পানি বিকারে নিয়ে বিকারটিকে তারজালির ওপর স্থাপন করি ও স্পিরিট ল্যাম্প এর সাহায্যে বিকারটিতে তাপ দিতে থাকি। ফলে পানি বাষ্পীভূত হয়ে উড়ে যাবে কিন্তু লবণ বিকারে থেকে যাবে। এ অবস্থায় বিকারটিতে অল্প পরিমাণ পানি থাকতেই তাপ দেওয়া বন্ধ করি।

(৮) লক্ষ্য করি বিকারের তলায় কঠিন পরিস্কার লবণ জমা হয়েছে কিনা।

(১) পরিস্রাবণ করার সময় মিশ্রণকে ভালােভাবে থিতিয়ে নিয়ে উপরের পরিষ্কার দ্রবণকে প্রথমে ফিল্টার পেপারে ঢালতে হবে, যেন বেশি বালু ফিল্টার পেপারে জমা না হয়। এতে পরিস্রাবণ দ্রুত ও সহজতর হয়।

(২) মিশ্রণকে কাচ দন্ড দ্বারা ভালােভাবে নেড়ে সকল বালু ও দ্রবণ ফিল্টার পেপার এর উপর ঢালতে হবে।

(৩) পরিশেষে বাষ্পীকরণ এর সময় শেষ পর্যায়ে কিছু পানি থাকতে তা প্রয়ােগ বন্ধ করতে হবে যাতে কাচের বাটি ফেটে না যায়।

সিদ্ধান্তঃ বালু মিশ্রিত খাবার লবণকে খাবার উপযােগী করা সম্ভব।

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প্রতিবেদকের নামঃ

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প্রতিবেদকের ঠিকানাঃ

প্রত্যেক শিক্ষার্থীর রসায়ন পরীক্ষাগারে বিশেষ সতর্কতা অবলম্বন করা আবশ্যক

সাধারনত যেখানে বিজ্ঞানের বিভিন্ন বিষয়াদি নিয়ে পরিক্ষা নিরীক্ষা এবং গবেষণা করা হয় তাকে পরীক্ষাগার বা রসায়ন গবেষণাগার (Chemistry Laboratory) বলে।

রসায়ন গবেষণাগারে বিভিন্ন রাসায়নিক দ্রব্য থাকে । প্রায় প্রত্যেকটি রাসায়নিক দ্রব্যই আমাদের জন্য অথবা পরিবেশের জন্য কম-বেশি ক্ষতিকর। কোনাে রাসায়নিক দ্রব্য বিস্ফোরক জাতীয়,কোনাে রাসায়নিক দ্রব্য দাহ্য (সহজেই যাতে আগুন ধরে যায়) কোনােটি আমাদের শরীরে সরাসরি ক্ষতি করে আবার কোনােটি পরিবেশ ক্ষতি করে রসায়ন পরীক্ষাগারে যে যন্ত্রপাতি বা পাত্র ব্যাবহার করা হয় তার বেশির ভাগই কাচের তৈরি। তাই এ রসায়ন পরীক্ষাগারে ঢােকা থেকে শুরু করে বের হওয়া প্রতিটি পদক্ষেপে সতর্কতামূলক ব্যবস্থা নিতে হবে। অসতর্ক হলেই যেকোনাে ধরনের দূর্ঘটনা ঘটে যেতে পারে। যেমনঃ-এসিড গায়ে পড়লে শরীর ক্ষত সৃষ্টি হবে।পােশাকে পড়লে পােশাকটি নষ্ট হয়ে যেতে পারে। এছাড়া রসায়ন গবেষণাগারে অগ্নিকান্ড বিস্ফোরণসহ নানা ধরনের ছােট বড় দুর্ঘটনা ঘটতে পারে।

তাই শরীরকে রক্ষা করতে পরতে হবে নিরাপদ পােশাক বা অ্যাপ্রােন। রসায়ন গবেষণাগারে ব্যবহৃত অ্যাপ্রােনের হাতা হবে হাতের কবজি পর্যন্ত আর লম্বায় হাটুর পর্যন্ত। এটি হাতকে সুরক্ষা দেওয়ার জন্য ব্যবহৃত হয় গ্লাভস যা চোখকে রক্ষা করার জন্য সেফটি গগলস হিসেবে ব্যবহার করা হয়। যেকোনাে ধরনের রাসয়নিক দ্রব্য ব্যবহারের আগেই আমাদের জেনে নিতে হবে সে রাসায়নিক দ্রব্যটি কোন প্রকৃতির। সেটি কি বিস্ফোরক অথবা দাহ্য নাকি তেজস্ক্রিয়াসেটি বােঝানাের জন্য রাসায়নিক পদার্থের বােতল বা কৌটার লেবেলে এক ধরনের সাংকেতিক চিহ্ন ব্যবহার করা হয়।

Allsigns International Ltd - Explosive Substance

দাহ্য পদার্থ ( Flammable Substance) :- অ্যালকোহল, ইথার ইত্যাদি দাহ্য। পদার্থ।এসব পদার্থে দ্রুত আগুন ধরে যেতে পারে।তাই এদের আগুন বা তাপ থেকে সব সময় দূরে হবে। ক্ষত সৃষ্টিকারীঃ- এ চিহ্নধারী পদার্থ শরীরে লাগলে শরীরে ক্ষত সৃষ্টি করে।শ্বাস-প্রশ্বাসের সাথে গ্রহন করলে তা শরীরের ভেতরের অঙ্গেরও ক্ষতিসাধন করতে পারোহাইড্রোক্লোরিক এসিড,সালফিউরিক এসিড,সােডিয়াম হাইড্রোক্সাইডের ঘন দ্রবন এ জাতীয় পদার্থের উদাহরণ।

DANGEROUS TO THE ENVIRONMENT – Linden Signs & Print

পরিবেশের জন্য ক্ষতিকর ( Dangerous for the environment ) :- এ চিহ্নধারী পদার্থগুলাে পরিবেশের জন্য ক্ষতিকর।অর্থাৎ উদ্ভিদ ও প্রানী উভয়ের জন্যই বিপজ্জনক।এ ধরনের পদার্থের উদাহারণ হলাে লে মার্কারি ইত্যাদি।তাই এগুলাকে ব্যবহারের সময় যথেষ্ট সং হওয়া প্রয়ােজন।আবার,ব্যবহারের পরে যেখানে সেখানে ।। ফেলে তা একটি নির্দিষ্ট স্থানে রাখতে হবে।এসব পদার্থকে যথাসম্ভব পুনরুদ্ধার করে আবার ব্যবহার করার চেষ্টা করে হবে।তাহলে এগুলাে সহজে পরিবেশে ছড়িয়ে পড়তে পারবে না।

স্বাস্থ্য ঝুঁকিপূর্ণ পদার্থ (Health Risk Substance) :- এ ধরনের পদার্থ ত্বকে লাগলে বা শ্বাস-প্রশ্বাসের সাথে শরীরের ভেতরে গেলে শরীরের স্বল্পমেয়াদি বা দীর্ঘমেয়াদি ক্ষতিসাধন করে।এগুলাে শরীরের মধ্যে গেলে ক্যানসারের মতাে কঠিন রােগ হতে পারে কিংবা শ্বাসতন্ত্রের ক্ষতিসাধন করতে পারে।এ ধরনের পদার্থের উদাহারণ হলাে বেনজিন,টুলইন,জাইলিন ইত্যাদি।তাই এগুলােকে সতর্কভাবে রাখতে হবে এবং ব্যবহারের সময় অ্যাপ্রােন,হ্যান্ড গ্লাভস,সেফটি গগলস এগুলাে পরে নিতে হবে।

বিষাক্ত পদার্থ (Toxic Substance)- এ চিহ্নধারী পদার্থ বিষাক্ত প্রকৃতির।তাই শরীরে লাগলে যা শ্বাস-প্রশ্বাসের মাধ্যমে শরীরে প্রবেশ করলে শরীরের নানা ধরনের ক্ষতি হয়ে যেতে পারে।বেনজিন,ক্লোরােবেনজিন,মিথানল এ। ধরনের পদার্থ।এ ধরনের পদার্থ ব্যবহারের সময় অ্যাপ্রােন,হ্যান্ড গ্লাভস,সেফটি গগলস ইত্যাদি ব্যবহার করতে হবে।

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Chemistry – Unit 1 Assignment English Medium
Chemistry – Unit -1 -Tamil Medium Assignment
chemistry Assignment Answer Key - Download Here _ TM

Class:12 Subject: Chemistry

I. Multiple Choice Questions

1. The metal oxide which cannot be reduced to metal by carbon is

a. PbO

b. Al2O3

c. ZnO

(b) Al 2 O 3

2. Electrochemical process is used to extact

a. iron

b. Lead

c. Sodium

3. Considering Ellingham diagram which of the following metals can be used to reduce

b. Cu

c. Mg

4. In the electrolylic refining of copper which one of the following is used as anode?

a. pure copper

b. impure copper

c. carbon rod

d. platinum electrode

5. Zinc is obtained from ZnO by

a. carbon reduction

b. reduction using silver

c. electro chemical process

d. acid leaching

6. Which of the following is used for concentrating ore in metallurgy?

a. Leaching

b. roasting

c. froth flotation

d. both a and c

7. Cupellation is a process used for the refining of

a. silver

b. lead

c. copper

8. Which acts as a collector in froth floatation process?

a. Methyl xanthate

b. ethyl xanthate

c. pine oil

d. sodium cyanide

9. Zone refining process is based on -------------principle

a. Fractional distillation

b. simple distillation

c. liquefaction

d. fractional crystallization

10. ---------is used in making luminous paints, fluorescent lights and x-ray screens.

a. Aluminium oxide

b. copper

c. zinc sulphide

d. zinc oxide

II. Very Short Answer.

1. Differentiate between minerals and ores

Minerals contain a low percentage of metal.

Metal cannot be extracted easily from minerals.

Clay Al2O3. SiO2. 2H2O is the mineral of aluminium.

Ores contain a large percentage of metal.
Ores can be used for the extraction of metals on a large scale readily and economically.
Bauxite Al2O3. 2H2O is the ore of aluminium.

2. Which type of ores can be concentrated by froth floatation method give two examples for such ores.

Sulphide ores can be concentrated by froth floatation method, e.g.,

Copper pyrites (CuFeS2H2)
Zinc blende (ZnS)
Galena (PbS)

3. Give any two uses of zinc

Applications of Zinc (Zn):

Metallic zinc is used in galvanising metals such as iron and steel structures to protect them from rusting and corrosion.
Zinc is also used to produce die-castings in the automobile, electrical and hardware industries.
Zinc oxide is used in the manufacture of many products such as paints, rubber, cosmetics, pharmaceuticals, plastics, inks, batteries, textiles arid electrical equipment. Zinc sulphide is used in making luminous paints, fluorescent lights and x-ray screens.
Brass an alloy of zinc is used in water valves and communication equipment as it is highly resistant to corrosion.

4. Write two limitations of Elingham diagram

Limitations of Ellingham diagram:

1. Ellingham diagram is constructed based only on thermodynamic considerations. It gives information about the thermodynamic feasibility of a reaction. It does not tell anything about the rate of the reaction. Moreover, it does not give any idea about the possibility of other reactions that might be taking place.
2. The interpretation of ∆G is based on the assumption that the reactants are in equilibrium with the product which is not always true.

5. Define roasting with one example.

The process of heating an ore (generally, sulphide are) is strongly below its melting point in the presence of an excess of air is called roasting.

PART – C

III. Short Answer

1. What is gravity separation process?

In this method, the ore having high specific gravity is separated from the gangue that has low specific gravity by simply washing with running water. Ore is crushed to a finely powdered form and treated with rapidly flowing current of water. During this process the lighter gangue particles are washed away by the running water. This method is generally applied to concentrate the native ore such as gold and oxide ores such as hematite (Fe2O3), tin stone (SnO2) etc.

2. Define calcination with one example

It is the process in which the concentrated ore is strongly heated in the absence of air. This method can also be carried out with a limited supply of air.

3. Write about magnetic separation process

Magnetic separation:

This method is applicable to ferromagnetic ores and it is based on the difference in the magnetic properties of the ore and the impurities. For example tin stone can be separated from the wolframite impurities which is magnetic. Similarly, ores such as chromite, pyrolusite having magnetic property can be removed from the non magnetic siliceous impurities.
The crushed ore is poured on to an electromagnetic separator consisting of a belt moving over two rollers of which one is magnetic. The magnetic part of the ore is attracted towards the magnet and falls as a heap close to the magnetic region while the nonmagnetic part falls away from it as shown in the figure.

4. Write about electrolytic refining of silver

The crude metal is refined by electrolysis. It is carried out in an electrolytic cell containing aqueous solution of the salts of the metal of interest. The rods of impure metal are used as anode and thin strips of pure metal are used as cathode.
The metal of interest dissolves from the anode, pass into the solution while the same amount of metal ions from the solution will be deposited at the cathode. During electrolysis, the less electropositive impurities in the anode, settle down at the bottom and are removed as anode mud. Let us understand this process by considering electrolytic refining of silver as an example.

Pure silver

Impure silver rods

Electrolyte:

Acidified aqueous solution of silver nitrate. When a current is passed through the electrodes the following reactions will take place Reaction at anode.

2Ag (s) → Ag+(aq) + 1 e–

5. Describe a method for refining nickel

The impure nickel is heated in a stream of carbon monoxide at around 350K. The nickel reacts with the CO to form a highly volatile nickel tetracarbonyl. The solid impurities are left behind.

Ni (s) + 4 CO (g) → Ni(CO)4(g)

On heating the nickel tetracarbonyl around 460 K, the complex decomposes to give pure metal.

Ni(CO)4 (g) → Ni (s) + 4 CO (g)

PART – D

IV. Write in detail.

1. Explain froth flotation process

Froth flotation:

This method is commonly used to concentrate sulphide ores such as galena (PbS), zinc blende (ZnS) etc. In this method, the metallic ore particles which are preferentially wetted by oil can be separated from gangue. In this method, the crushed ore is suspended in water and mixed with frothing agent such as pine oil, eucalyptus oil etc. A small quantity of sodium ethyl xanthate which acts as a collector is also added. A froth is generated by blowing air through this mixture.
The collector molecules attach to the ore particle and make them water repellent. As a result, ore particles, wetted by the oil, rise to the surface along with the froth. The froth is skimmed off and dried to recover the concentrated ore. The gangue particles that are preferentially wetted by water settle at the bottom.
When a sulphide ore of a metal of interest contains other metal sulphides as impurities, depressing agents such as sodium cyanide, sodium carbonate etc are used to selectively prevent other metal sulphides from coming to the froth. For example, when impurities such as ZnS is present in galena (PbS), sodium cyanide (NaCN) is added to depresses the flotation property of ZnS by forming a layer of zinc complex Na2[Zn(CN)4] on the surface of zinc sulphide.

2. Explain zone refining process

1. Zone Refining method is based on the principles of fractional crystallisation. When an impure metal is melted and allowed to solidify, the impurities will prefer to be in the molten region, i.e. impurities are more soluble in the melt than in the solid state metal.
2. In this process, the impure metal is taken in the form of a rod. One end of the rod is heated using a mobile induction heater which results in melting of the metal on that portion of the rod.
3. When the heater is slowly moved to the other end the pure metal crystallises while the impurities will move on to the adjacent molten zone formed due to the movement of the heater. As the heater moves further away, the molten zone containing impurities also moves along with it.
4. The process is repeated several times by moving the heater in the same direction again and again to achieve the desired purity level.
5. This process is carried out in an inert gas atmosphere to prevent the oxidation of metals.
6. Elements such as germanium (Ge), silicon (Si) and galium (Ga) that are used as semiconductor are refined using this process.
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Subject: Science | Chemistry
UNIT-7 Atoms and Molecules

10 th Chemistry -UNIT-7 Atoms and Molecules (Assignment Questions)

Part –a, i. choose the correct answer, 1. number of electrons, protons and neutrons present in 17cl 35 , 17cl 37 is------- --------.

a) 17e¯ , 17p+, 17n

17e¯ , 20p+, 19n

b) 18e¯ , 18p+, 17n

17e¯ , 17p+, 19n

c) 17e¯ , 17p+, 18n

20e¯ , 20p+, 17n

d) 18e¯ , 17p+, 18n

17e¯ , 17p+, 20n

2. Isobars are defined as---------

a) Elements show same atomic number with different mass number

b) Elements show same mass number with different atomic number

c) Elements show same valency

d) None of these

3. The Atomicity of Glucose molecule is ________.

4. the mass of 5 moles of sodium is -------------, 5. number of atoms present in 3 moles of iron is--------.

a) 6.023 x 10 23

b) 18.069 x 10 23

c) 12.046 x 10 23

II. Short Answer.

12. define : relative atomic mass, relative atomic mass of an element is the ratio between the average mass of its isotopes to \(\frac{1}{12^{th}}\)part of the mass of a carbon-12 atom. it is denoted as ar., 13.give any two examples for heteroatomic molecules, hi, hcl, co, hbr, hf., 14.calculate the number of moles in 46 g of sodium, part – c, iii.write in detail., 17.give the salient features of “modern atomic theory”.

An atom is no longer indivisible.
Atoms of the same element may have different atomic mass.
Atoms of different elements may have the same atomic masses.
Atoms of one element can be transmuted into atoms of other elements. In other words, an atom is no longer indestructible.
Atoms may not always combine in a simple whole-number ratio.
Atom is the smallest particle that takes part in a chemical reaction.
The mass of an atom can be converted into energy [E = mc2].

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SSC Chemistry Assignment 2021 Answer

/ By Jagobahe

SSC Chemistry Assignment 2021 is announced a few days ago. রসায়ন অ্যাসাইনমেন্ট উত্তর. Rosayon Assignment Answer publish. রসায়ন অ্যাসাইনমেন্ট 2 উত্তর is also publish on our site. After dshe.gov.bd publish the science group assignment on their website. As well as they also publish the Science Chemistry all week assignment question 2021. on their website. So, we collect all the Chemistry assignment question from the website and make SSC chemistry assignment solution 2021. All the examines of chemistry assignment papers must submit their assignment.

In this post, we are going to publish all the Chemistry assignment sheet 2021 on our website. So that all the students from class 10 assignment and SSC examines 2021 can easily solve the question. In this post, we’ll discuss all the maters of chemistry assignment form in details. So, SSC students who has a lot of confusion about chemistry assignment table can get all the answer from this post. You just need to follow all the questions carefully. After reading the question, you’ll find all the answers from this post. Step by step we are going to publish all the method of SSC chemistry assignment board.

Biology All Week SSC Assignment Answer 2021 [Article] Physics All Week SSC Assignment Answer 2021 Higher Math All Week SSC Assignment Answer 2021

SSC Chemistry Assignment 2021 5th Week Question

SSC Chemistry 2nd step assignment is published today. As before the authority only publish the 2nd and 3rd week assignment question last week. So, in this step they publish the 5th week chemistry assignment question. As all we know that this is the SSC Chemistry Assignment 3 2021. because there is not chemistry 4th week assignment is available. In the 4th week authority didn’t announced any assignment. So, this is the chemistry assignment 3. Now wee need to discuss about the Chemistry assignment 5th week assignment answer. Follow the next section for the chemistry assignment question 5th week 2021 ssc.

So, 5th week chemistry ssc assignment question is little different. This is from the one of chapter from textbook. This question is belongs to chemical structure of the atoms. So, you need to carefully read the question before start writing answer 2021. Because you may need to write some mathematical calculation of their chemical reaction. So, read the 5th week chemistry assignment 2021 question before you start the writing of the solution. And please keep all the instruction in mins. See the image version of the SSC Chemistry Assignment question 5th week 2021.

Download SSC Chemistry Assignment 2021 5th Week Question

SSC Chemistry Assignment 2021 5th Week Answer

Now we already clearly know the chemistry 5th week question about. So, you have to listen carefully our instruction. Because in the last 3 week assignment answer we discuss the matter very well. So, the students of the SSC Assignment 2021 who follow our instruction get highest mark. So, if you have to plan to get a highest mark on the 5th week chemistry assignment answer then please do all the things we’ve asked for. An this step could help you to reach your goal. In the next section we make a 5th week Chemistry assignment solution written in details. So, read the next assignment answer very closely.

So, this is the most important part of the post. Because here is this section we are going to publish ssc chemistry 5th week assignment answer 2021. As we already learn about chemistry assignment question 5th week 2021 from the section above. So, now this is the time for answer the assignment answer. Let’s start the solution making part. Because this question is very important. So, you need to carefully follow all the rules and instruction of the question. Then follow your text book page number and you’ll able to easily write your 5th week chemistry assignment 2021 answer easily.

Download SSC Chemistry Assignment 2021 5th Week Answer

SSC Chemistry Assignment 2021 6th Week Question

After a long waiting of 2 days, Directorate of secondary and higher education just publish the Chemistry 6th week assignment question 2021. Now, we are happy to see the question that there is a lot of opportunity. We are continuously trying to solve all the subjects and papers assignment question. In its continuity, we are going to publish the 5th week ssc chemistry assignment 2021. From the morning a lot of students are requesting us to publish the chemistry assignment question 2021 6th week. So, we planed to publish the assignment question in below.

According to the ssc chemistry assignment 2021 question 6th week, we can see that, this is the question based on the text book chapter. So, there is all the question listed in the text book. So, chemistry 6th week assignment question is little different and much harder than last week. So, you must be careful when you are try to answer this 6th week chemistry assignment question 2021. If you feel you need to know all the instruction and mark distribution of ssc assignment then please check the attach ssc chemistry 6th week assignment answer below.

Download SSC Chemistry Assignment 2021 6th Week Question

SSC Chemistry Assignment 2021 6th Week Answer

After complete the discussion on the chemistry assignment question 6th week. Now in this section we’ll talk about the details answer of the chemistry assignment answer 6th week 2021. So, carefully read the full question and all the instruction first. Before we publish the 6th week chemistry assignment answer 2021. You need to know all the guidelines. Because if you didn’t follow all the instruction while writing assignment answer. You’ll be get low mark on the final assignment result. So, follow al lthe rules of ssc chemistry assignment 2021 6th week. In below see the whole answer of the assignment.

Now this is the part for the 6th week ssc chemistry assignment answer 2021 making time. Please keep in mind that this is the ssc chemistry assignment 4 for exam 2021. Though it is publish on the 6th week but this is the ssc chemistry assignment 4. Because in this 2nd steps, There is no chemistry assignment on 4th week. So, you get your ssc chemistry assignment answer. Now write the whole answer in the paper and complete the cover page fill-up. After that attach the cover page of chemistry 6th week assignment to assignment paper. Then submit it to school.

Download SSC Chemistry Assignment 2021 6th Week Answer

SSC Chemistry Assignment 2021 3rd Week Question

Last week we solve the SSC Chemistry assignment 2nd week answer. A lot of the students follow our Chemistry 2nd week assignment answer and they get high mark on that. So, there are also requesting this week to publish Chemistry 3rd week assignment answer. Though this is a very difficult task, but only for welfare of the SSC 2021 candidates we plan to make a chemistry 3rd week assignment solution. So, in this post we are going to publish the 3rd week chemistry assignment question and answer. Read the whole article.

Now we’ll discuss about chemistry 3rd week assignment answer 2021. So, this is the chemistry assignment 2 for submit. Chemistry 3rd week assignment question is Li, Be, Na, Mg মৌল চারটির ইলেকট্রন বিন্যাসের আলোকে পর্যায় সারণিতে অবস্থান, তুলনামূলক আয়োনিকরণ শক্তি এবং মৌল সংশ্লিষ্ট গ্রুপ বা শ্রেণীর বৈশিষ্ট সম্পর্কিত একটি প্রতিবেদন প্রণয়ন। So, the 3rd week answer is very clear to answer. This is very easy to do. In below we already publish this chemistry 3rd week assignment answer 2021. You just need to follow all the instruction and guide to complete your SSC Chemistry assignment 2021.

Download SSC Chemistry Assignment 2021 3rd week Question PDF

SSC Chemistry Assignment 2021 3rd Week Answer

Finally, we got the 3rd week ssc chemistry assignment question. As like before a lot of candidates follow your previous 2nd week chemistry assignment question and answer from our website. So, they submit their assignment following the question and answer guide. So, they get highest mark on the ssc chemistry assignment. That’s why they again request us to solve their ssc chemistry assignment 3rd week answer also. Though this is not the very easy task. But we still plan to make the answer for the students for great welfare.

According to the chemistry 3rd week question we can see that, there is a lot of atoms question. Li, Be, Na and Mg. We need to specify their present role on the periodic table. We also need to discuss about the relative ionization energy and finally we need to make a report on the the characteristics of the group or class corresponding to the element. So, the answer is very clear now. So, you can now write your assignment answer from this section. Follow all the instruction here and write your 3rd week ssc chemistry assignment answer 2021.

Download SSC Chemistry Assignment 2021 3rd week Answer PDF

SSC Chemistry Assignment 2021 2nd Week Question

Now lets talk about the SSC Chemistry 2021 2nd week question. We already know about there are three week’s assignment is publish already. But in this three week, SSC Chemistry assignment need to submit only on 2nd week and 3rd week. There is no need to submit the SSC Chemistry assignment 2021 1st week. Because there is no syllabus for 1st week on assignment table. So, SSC Chemistry assignment 2021 2nd week question is now publish. In below check the question.

SSC Chemistry 2nd week question is প্রতীকের পাশে উল্লেখিত ভরসংখ্যাবিশিষ্ট মৌলের নিউট্রন সংখ্যা, বোর মডেল অনুসারে পরমাণু গঠনের চিত্র, শক্তিস্তরে ইলেক্ট্রন বিন্যাস এবং উপশক্তিস্তরে ইলেক্ট্রন বিন্যাস সংশ্লিষ্ট একটি প্রতিবেদন প্রণয়ন। So, check the question carefully. And the selected materials is Na(11), P(15), K(19) and Cu(29). According to the question below, this is the chemistry assignment 2nd week assignment from thirt chapter of textbook. So, open the chapter of the book and find answer for complete SSC Chemistry assignment answer 2021 2nd week.

SSC Chemistry Assignment 2021 2nd week answer

SSC Chemistry Assignment 2021 2nd Week Answer

So, from the above question we can see that, there we can see the Chemistry assignment question is from 3rd chapter of the text book. So, First lets discuss about the 3rd chapter. This is the chapter depend of The structure of matter. So, in this chapter all the subject are detailed on matter. How matter work, how its created etc is the topic of the chapter. Bohr model is one of the part of this chapter. Mass of the matter is also the part of this chapter. So, you have to keep that info mind when you are writing chemistry assignment answer on this chapter.

Now come to the question. 2nd week SSC Chemistry assignment question is one the matter of Sodium(Na), Phosphorus (P), Potassium (K) and Copper(Cu). So, first to make the answer of this chemistry assignment, read about this atom. After that you’ll be only able to write the answer of chemistry 2nd week answer. So, started reading the 3rd chapter of the textbook and start writing chemistry 2nd week assignment answer 2021.

Download SSC Chemistry Assignment 2021 2nd week Answer PDF

SSC Science Group Assignment Question 2021

Before discuss about the SSC assignment 2021 chemistry, talk a little about the science group assignment 2021. Because all the students of the same group need to submit all the mandatory subjects assignment answer. So, if you are a student who submitting ssc chemistry assignment 2021, then you must submit all other physics, biology and higher mathematics ssc assignments also. We already make answer for these all science group assignment’s answer. So, link are listed in the below. Click on the specific link which subject you need assignment answer 2021.

So, there are 3 different group on the SSC exam. Example, Science, Arts and Commerce. Most importantly, mandatory subjects are different from each other group. And the authority only asked for mandatory subjects. So, SSC assignment will be different from each other group. Science group has only 4 compulsory subjects. Physics, Chemistry, Biology and Higher Mathematics. So, you must submit all the subjects assignment answer 2021 if you are student of science. From the ssc chemistry assignment table, see details of subjects.

SSC Chemistry All Week Assignment 2021

From the ssc chemistry assignment grade, we see that there are total 12 week for assignment. But Chemistry is listed on ssc chemistry assignment on guccho 2. So, you need to follow guccho 2 for assignment answer. On the guccho 2 there is only 8 week for submit assignment. So, there are 4 week interval in the middle for complete other week’s assignment answer. In this post, all the details information about SSC Chemistry assignment is discuss. All week chemistry assignment answer is also answer on the below.

As we see on the SSC Assignment notice that, there is 3 phase for submit the total 12 assignment. In the first phase, students needs to submit their 1st 3 week chemistry assignment answer. But in the 3 week of first week, chemistry assignment answer need to submit only on 2 week. SSC Chemistry 1st week assignment answer don’t need to submit. Chemistry assignment only need to submit only on 2nd week and 3rd week. After that, on the 2nd phase, chemistry assignment will be submit on 5th and 6th week. Finally at the 3rd and last phase Rosayon ssc assignment solution need to submit on 8th and 9th week.

All Week SSC Chemistry Assignment Question 2021

According to the assignment grid, you need to know the structure of the assignment. Because there are several topic on submit assignment for all week. Every SSC Assignment has two paper in different. So, you first clear that, when which paper need to submit. As there are total 12 week but 8 week chemistry assignment need to submit. So, plan is very important. As, Chemistry ssc assignment is not so easy to submit. Because this is one of the hard subject to make assignment solution.

Whatever, the good news is you didn’t need to submit your all ssc chemistry assignment at a time. You have a lot of time. Because they didn’t publish chemistry all week assignment question yet. In the first phase, they publish 2nd and 3rd week assignment. This is count as ssc chemistry assignment 1. Also they publish 3rd week chemistry assignment question. Which is count as chemistry ssc chemistry assignment 2. So, you need to make answer for Chemistry assignment answer 2021 step by step. Follow out chemistry assignment answer writing method below.

SSC All Week Chemistry Assignment Answer 2021

This is the most important part of the post. Because only for this section all the ssc students are searching for these article. Though above we already talk about SSC Chemistry assignment’s table, syllabus, mark distribution, all the subjects and chapters etc. We also talk about Chemistry Assignment all week question above. But all the students need to make answer for chemistry assignment. Though this process is already discussed above, but a few topic is rest yet. So, in this section we’ll talk details about SSC Chemistry Assignment Answer making for exam 2021.

Now, come to the point. How to make ssc chemistry assignment paper solution easily. Because you need to submit the assignment with answer of rosayon subject. If you follow our all the instruction in details you can easily complete the chemistry assignment answer. Though all of you know there is a weekly table for ssc chemistry subject answer. So, we need to discuss the Chemistry assignment answer making on week by week. SSC Chemistry assignment question is different from each week 2021. So, in below discuss about weekly chemistry assignment answer 2021.

Weekly Chemistry SSC Assignment Answer 2021

However, in this section we are going to publish the weekly Chemistry assignment answer. So, you can write your require SSC assignment answer from this article. We’re going to publish all the week’s assignment answer is this post. We follow the weekly chemistry assignment answer from the table of assignment. Now talk about the weekly schedule of chemistry assignment 2021. Chemistry subject has 8 week assignment schedule for SSC examines of 2021. Chemistry ssc chemistry assignment 2021 1st week answer is not needed. Because there is no assignment for 1st week.

SSC Chemistry assignment assignment answer is start from 2nd week. Because every week has only 1 assignment for every subject. And between total of 3 week every subject need to submit assignment only on 2 week. So, on this phase SSC Chemistry assignment need to answer for only 2nd and 3rd week. Letter, 5th and 6th week assignment need to submit. So, this week is already completed with 2nd and 3rd week assignment. This ssc chemistry assignment 2021 2nd week answer and ssc chemistry assignment 2021 3rd week answer already publish. Follow the post below.

All Week SSC Chemistry Assignment PDF Answer Download 2021

So, you already get all of your SSC Chemistry assignment answer from our post. Now you just need to type the assignment on your assignment. Please keep in mind when writing assignment in the papers that, you follow all the rules. We already discuss all the rules. If you have still any confusion please read the article again. You can follow our assignment answer and write it on your paper. After that, must fill up the SSC Chemistry assignment cover page and attach it with. If you have no idea about cover page please read our SSC Assignment 2021 all information and answer post in our blog.

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We already discuss about everything on this post. How to write chemistry assignment answer. Also what are the SSC Chemistry assignment syllabus and table. How to make a solution of Chemistry assignment question. How to download SSC Chemistry assignment question pdf file. Most importantly, how to make the answer for chemistry assignment. So, all the student and examines of SSC exam 2021 will get benefited from this post. Though all the things is ready, you may found any information missing from the blog.

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Education & result website in bangladesh, chemistry assignment class 9 7th week answer 2021 (রসায়ন অ্যাসাইনমেন্ট).

August 9, 2022 allnewjob 7th Week Assignment 2021 , Assignment , Class 9 Assignment 21

Chemistry Assignment Class 9 7th Week Answer 2021 (রসায়ন অ্যাসাইনমেন্ট). Class 9 chemistry assignment answer and solution for the Bangladeshi science background students. In the 7th week syllabus list of the directorate of secondary and higher education authority, they have included the chemistry subject for the class 9 student in Bangladesh. As you have a very short deadline, we have come here to help class 9 student. Therefore, read this full post and download your class 9 chemistry assignment answer for the 7th week in 2021.

Class 9 Chemistry Assignment 2021

The authority at the secondary and higher education directorate publishes chemistry assignment class 9 syllabus. Later, the authority has announced the assignment task for the class 9 students. In the 7th three chapters are the assigned task for the 7th week assignment 2021 . In the chapters, the dshe has selected several questions and topics also. Class 9 chemistry assignment includes the definition of chemistry, present statues of substance, and structure of the substance.

For the class 9 student, we have come up with chemistry subject full syllabus. You can also download your chemistry assigned tasks at www.dshe.gov.bd 2021 syllabus. The more about the chemistry assignment of class 9 will be here in the below PDF file for download. You can also get the solution for your chemistry question in the following section of this post. We are here to relive your tension of how to write a assignment class 9 .

Chemistry Class 9 Assignment 7th Week

Class 9 chemistry syllabus for bd student in the 7th assignment week of 2021 is here. In the 7th assigned task, the students have been asked to separate salt and sand by their own hand ( হাতে কলমে কাজের মাধ্যমে খাদ্য লবণ ও বালির মিশ্রণ পৃথকীকরণ) . Then, they have to answer for the following questions. The class 9 assignment 2021 7th chemistry question is which method has been used in this test (এ পরীক্ষা কোন কোন পদ্ধতি ব্যবহার করা হয়েছে), কাজের ধারাবাহিক বর্ণনা কর, পরীক্ষণ পদ্ধতির দুইটি ধাপ.

Here is your chemistry class 9 assignment questions both in Bangla and English. In the following section, we will try to provide possibly answer for the chemistry assignment question. For making chemistry assignment you need to read the 7th, second and third chapters in your NCTB rosayon book. You can also download your NCTB Class 9 Chemistry Text Book PDF from this link.

Class 9 chemistry 7th Week Assignment 2021

Class 9 Chemistry 7th Week Assignment Answer

We can provide the answer here in Bangla of the class 9 chemistry assignment 2021 . However, it will be then a large post that will be very difficult to read. That is why are not posting the assignment answer in English format also. Rather we choose to upload the answer in a picture and PDF file so that it could be visible for everyone. However, you can watch www.dshe.gov.bd 2021 Assignment. Hence, for getting your chemistry assignment answer you need to follow the next picture.

You can also download the 7th week chemistry assignments for class 9 answer science student from below PDF download link. It is not easy for us to make answer for a srijonshil question. However, it is true that answer can vary into person to person. Therefore, you should choose what word or sentence you want to use in your chemistry assignment. We have also working to provide answer of all subject here for the class 9 8 7 6 students.

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21 Comments

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HSC Assignment 2021 Chemistry Answer (All Weeks)

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SSC Chemistry Assignment 3rd Week Answer 2021 – SSC assignment 2021 chemistry 3rd week – SSC assignment chemistry 3rd week answer

SSC Chemistry 3rd Week Assignment 2021. SSC 2021 Chemistry Assignment Answers have been assigned for SSC Candidates 2021 3rd, 3rd, 5th, 6th, 8th, 9th, 11th, and 12th week’s assignment. A total of 8 Assignment answers have to be submitted for SSC Chemistry Assignment 2021. The full Marks for these eight assignments will be 50. SSC 2021 Chemistry Assignment for 2nd and 3rd week has already been published. The next week’s assignment will be published after the submission of these two weeks’ solutions.

SSC Chemistry 3rd Week Assignment 2021

Chemistry assignment for 3rd week has been published for the candidates of SSC science branch of 2021. The “Chapter Three: The Structure of Matter” section is scheduled for the second week. Read the scheduled chapter well and practice and write the answer to the assigned question for the assignment. If you want, you can take a look at the chemistry assignment solution we have created.

SC Chemistry Assignment 3rd Week Answer 2021, Dear Examiners of the SSC 2021 Science Department, The SSC Exam 2021 Chemistry 1st Week Assignment for you has been selected. SSC Chemistry Assignment 2021 & 2022 question and answer is available here. SSC 2021 exam candidates and SSC 2022 exam candidates, both Chemistry 2nd week, the 3rd-week assignment has been published. So we give all the solutions to the SSC Chemistry Assignment.

SSC candidates have their first assignment in the Chemistry subject in the 3rd Week. Chemistry is determined from the third chapter of the first assignment. The title of the third chapter is the structure of matter. SSC chemistry assignment 3rd week. How a substance is formed and the different states of matter are discussed in this chapter. Thus, from the 3rd-week chemistry assignment of SSC, we will learn about the composition of matter. In order to solve the SSC 3rd week chemistry assignment correctly, one has to acquire detailed knowledge about substances and the basics of matter. chemistry assignment SSC 2021 1st week answer

Otherwise, it is not possible to give the answer to SSC 3rd week chemistry assignment correctly. So before writing the solution or answer of the SSC 3rd week chemistry assignment one must acquire knowledge about the content of the assignment.SSC assignment 2021 3rd week answer

SSC Chemistry Assignment

Here the structure of the atom according to the Bohr model should be mentioned along with the diagram and also the electron configuration of energy level and sub-energy level should be discussed. So those examinees who are worried about SSC 3rd Week chemistry assignment should follow our instructions. We will provide guidance on the solution of the 3rd Week assignment of chemistry or writing the answer sheet. Also for the convenience of students, we will upload the solution or answer of SSC 3rd Week chemistry assignment in PDF format. If anyone wants to download the solution or answer to 3rd Week chemistry assignment then visit our website. SSC assignment 2021 chemistry 3rd week

chemistry assignment SSC 2021

Students need to follow a number of guidelines for writing the solution or answer of the 3rd Week chemistry assignment. Creating a solution or answer to the assignment by following the instructions below will definitely yield excellent results. As a result, it will be helpful to make the results of SSC 2021 better. Now I will give the instructions so that the students can create chemistry assignments in a good way by following them. The answer must be the number of neutrons of 4 elements. SSC assignment chemistry 1st week

Chemistry 3rd Week Assignment

Also the structure of the atom according to the model of 4 elements has to be described with diagrams. Electron arrangement should be shown in the energy level of 4 elements. It is also necessary to show the electron configuration of the sub-layer of 4 elements. If you follow the above guidelines and create a solution or answer sheet for the chemistry assignment, you will definitely get very good results. SSC chemistry assignment 2021 answer SSC assignment 2021 3rd week answer

SSC 3rd week assignment answer

We can learn a lot from the chemistry assignment of SSC 3rd Week. For example, we can calculate the number of electrons, protons and neutrons in an atom. Rutherford and Bohr will also be able to describe the atomic model of atomic structure. I can arrange the electrons of the atom in different orbits of the atom and in different layers of the orbit.

SSC 2021 Chemistry Assignment 3rd week Answer

এসএসসি ২০২১ অ্যাসাইনমেন্টের ৩য় সপ্তাহে রসায়ন বিষয়নি নির্ধারণ করা হয়েছে। রসায়ন বিষয়ে এটি দ্বিতীয় অ্যাসাইনমেন্ট। তৃতীয় সপ্তাহের অ্যাসাইনেমেন্ট চতুর্থ অধ্যায়েল পর্যা সারণি নির্ধারণ করা হয়েছে। অধ্যায়টি ভালোভাবে পড়ো এবং অনুশীলন করে তোমার সমাধান তৈরি করো। তোমার রসায়ন ৩য় সপ্তাহের অ্যাসাইনমেন্ট সমাধান করার সময় অবশ্যই ইলেক্ট্রন বিন্যাস করে মৌল চারটির পর্যায় সারণির পর্যায় নির্ণয় করতে হবে, ইলেকট্রন বিন্যাস করে মৌল চারটর পর্যায় সারণির গ্রুপ বা শ্রেণি নির্ণয় করতে হবে, পর্যায় সারণির একই পর্যায় এবং একই গ্রুপ বা শ্রেণিতে পাশাপাশি অবস্থিত আয়নিকরণ শক্তির তুলনা করবে এবং মৌল সংশ্লিষ্ট গ্রুপ বা শ্রেণির বৈশিষ্ট উল্লেখ করবে। তুমি চাইলে আাদের তৈরি করা রসায়ন ৩য় সপ্তাহের অ্যাসাইনমেন্ট দেখে নিতে পারো।

SSC assignment 2021 chemistry 3rd week Answer 2021

স্তরঃ এস.এস.সি পরীক্ষা ২০২১

বিভাগঃ বিজ্ঞান

বিষয়ঃ রসায়ন

বিষয় কোডঃ ১৩৭

মোট নম্বরঃ ১৬

অ্যাসাইনমেন্ট নম্বর-০২

অধ্যায় ও শিরােনামঃ চতুর্থ অধ্যায়: পর্যায় সারণি

অ্যাসাইনমেন্টঃ Li, Be, Na, Mg মৌল চারটির ইলেকট্রন বিন্যাসের আলােকে পর্যায় সারণিতে অবস্থান, তুলনামূলক আয়নিকরণ শক্তি এবং মৌল সংশ্লিষ্ট গ্রুপ বা শ্রেণির বৈশিষ্ট্য সম্পর্কিত একটি প্রতিবেদন প্রণয়ন;

শিখনফল/বিষয়বস্তুঃ

১. মৌলের সর্ববহিঃস্তর শক্তিস্তরের ইলেকট্রন বিন্যাসের সাথে পর্যায় সারণির প্রধান গ্রুপগুলাের সম্পর্ক নির্ণয় করতে পারব (প্রথম ৩০ টি মৌল)

২. একটি মৌলের পর্যায় শনাক্ত করতে পারব।

৩. পর্যায় সারণিতে কোনাে মৌলের অবস্থান জেনে এর ভৌত ও রাসায়নিক ধর্ম সম্পর্কে ধারণা করতে পারব।

৪. মৌলসমূহের বিশেষ নামকরণের কারণ বলতে পারব।

৪. পর্যায় সারণি অনুসরণ করে মৌলসমূহের ধর্ম অনুমানে আগ্রহ প্রদর্শন করতে পারব।

নির্দেশনা (সংকেত/ধাপ/পরিধি):

১. ইলেকট্রন বিন্যাস করে মৌল চারটির পর্যায় সারণির পর্যায় নির্ণয় করতে হবে ইলেকট্রন বিন্যাস করে মৌল চারটির পর্যায় সারণির গ্রুপ বা শ্রেণি নির্ণয় করতে হবে।

২. পর্যায় সারণির একই পর্যায় এবং একই গ্রুপ বা শ্রেণিতে পাশাপাশি অবস্থিত মৌলের আয়নিকরণ শক্তির তুলনা করতে হবে।

৩. মৌল সংশ্লিষ্ট গ্রুপ বা শ্রেণির বৈশিষ্ট্য উল্লেখ করতে হবে।

অধ্যায় ০৪ পর্যায় সারণি অ্যাসাইনমেন্ট :

Li Be Na Mg

মৌল চারটির ইলেকট্রন বিন্যাসের আলোকে পর্যায় সারণিতে অবস্থান, তুলনামূলক আয়নিকরণ শক্তি এবং মৌল সংশ্লিষ্ট গ্রুপ বা শ্রেণির বৈশিষ্ট্যদ সম্পর্কিত একটি প্রতিবেদন প্রণয়ন।

নমুনা সমাধান

(ক) মৌলগুলাের ইলেকট্রন বিন্যাস লক্ষ্য করলে দেখা যাবে যে, লিথিয়াম (Li) এর ক্ষেত্রে সর্বশেষ ইলেকট্রন দ্বিতীয় শক্তি স্তরে প্রবেশ করেছে। তাই আমরা বলতে পারি, Li(3) এর পর্যায় হচ্ছে 2।

অনুরূপভাবে, FT বেরিলিয়াম (Be) এর ক্ষেত্রে সর্বশেষ ইলেকট্রন দ্বিতীয় শক্তি স্তরে প্রবেশ করেছে। তাই আমরা বলতে পারি, Mg(12) এরপর যায় হচ্ছে 3।

(খ) গ্রুপ বা শ্রেণি নির্ণয় :

প্রশ্নে উল্লেখিত মৌলগুলাের ইলেকট্রন বিন্যাস :

মৌলগুলাের ইলেকট্রন বিন্যাস লক্ষ্য করলে দেখা যাবে যে, লিথিয়াম (Li) এর ক্ষেত্রে সর্ববহিঃস্থ শক্তিস্তরে একটিমাত্র ইলেকট্রন রয়েছে। তাই আমরা বলতে পারি,Li(3) এর গ্রুপ হচ্ছে 1।

অনুরূপভাবে, বেরিলিয়াম (Be) এর ক্ষেত্রে সর্ববহিঃস্থ শক্তিস্তরে দুইটি ইলেকট্রন রয়েছে।

তাই আমরা বলতে পারি, Be(4) এর গ্রুপ হচ্ছে 2। সােডিয়াম (Na) এর ক্ষেত্রে সর্ববহিঃস্থ শক্তিস্তরে একটিমাত্র ইলেকট্রন রয়েছে। তাই আমরা বলতে পারি, Na(11) এর গ্রুপ হচ্ছে 1। ম্যাগনেসিয়াম (Mg) এর ক্ষেত্রে সর্ববহিঃস্থ শক্তিস্তরে দুইটি ইলেকট্রন রয়েছে। তাই আমরা বলতে পারি, Mg(12) এর গ্রুপ হচ্ছে 2।

(গ) তুলনামূলক আয়নীকরণ শক্তি :

আমরা জানি, একই পর্যায়ে যত বাম দিক থেকে ডান দিকে যাওয়া যায়, অর্থাৎ পারমাণবিক সংখ্যা যত বাড়তে থাকে পরমাণুর আকার ততােই হ্রাস পেতে থাকে। আর পারমাণবিক আকার হ্রাস পেলে পরমাণুর আয়নীকরণ শক্তি বাড়ে। কারণ, এতে একটি করে ইলেকট্রন যুক্ত হয় এবং নিউক্লিয়াসের সাথে আকর্ষণ বেড়ে যায়।

আবার, একই গ্রুপে উপর থেকে নিচে আসলে একটি করে নতুন শক্তিস্তর যুক্ত হয়। এর ফলে পারমাণবিক ব্যাসার্ধ বেড়ে যায়। ফলে আয়নিকরণ শক্তি কমে যায়। অর্থাৎ এখানে বেরিলিয়ামের (Be) আয়নীকরণ শক্তির মান সবচেয়ে বেশি।

আয়নিকরণ শক্তির ক্রম হবে নিম্নরূপ : 𝐵𝑒>𝐿𝑖>𝑀𝑔>𝑁𝑎 ।

(ঘ) মৌল সংশ্লিষ্ট গ্রুপ বা শ্রেণির বৈশিষ্ট্য :

প্রশ্নে উল্লেখিত মৌলগুলাের ইলেকট্রন বিন্যাস লক্ষ্য করলে আমরা দেখতে পাই যে, Li(3) এর গ্রুপ হচ্ছে 1। Be(4) এর গ্রুপ হচ্ছে 2। Na(11) এর গ্রুপ হচ্ছে 1। Mg(12) এর গ্রুপ হচ্ছে 2।

অর্থাৎ লিথিয়াম (Li) এবং সােডিয়াম (Na) একই গ্রুপে অবস্থিত এবং তাদের গ্রুপ হচ্ছে 1। আবার বেরিলিয়াম (Be) এবং ম্যাগনেসিয়াম (Mg) একই গ্রুপে অবস্থিত এবং তাদের গ্রুপ হচ্ছে 2.

গ্রুপ -1 (ক্ষার ধাতু)

পর্যায় সারণির ১নং গ্রুপে ৭টি মৌল আছে। এদের মধ্যে হাইড্রোজেন ছাড়া বাকি ৬ টি মৌলকে (লিথিয়াম, সােডিয়াম, পটাশিয়াম, রুবিডিয়াম, সিজিয়াম এবং ফ্রানসিয়াম ) ফ্রানসিয়াম) ক্ষারধাতু বলে।

এই ছয়টি মৌলের প্রত্যেকটি পানিতে দ্রবীভূত হয়ে এই ছয়টি মৌলের প্রত্যেকটি পানিতে দ্রবীভূত হয়ে হাইড্রোজেন গ্যাস এবং ক্ষার তৈরি করে বলে এদেরকে ক্ষারধাতু (Alkali Metals) বলা হয়।

এ ধাতু গুলাে খুবই সক্রিয়। এরা আয়নিক বন্ধন গঠন করে। এরা নরম ও চকচকে হয়।

গ্রুপ- 2 (মৃৎক্ষার ধাতু)

পর্যায় সারণির ২নং গ্রুপে বেরিলিয়াম, ম্যাগনেসিয়াম, ক্যালসিয়াম, স্ট্রনসিয়াম, বেরিয়াম এবং রেডিয়াম এই ৫ টি মৌল আছে। এই মৌলগুলােকে মৃৎক্ষার ধাতু বলে।

এই ধাতুগুলােকে মাটিতে বিভিন্ন যৌগ হিসেবে পাওয়া যায়।

আবার, এরা ক্ষার তৈরি করে। এজন্য সামগ্রিকভাবে এদের মৃৎক্ষার ধাতু (Alkaline Earth Metals)।

এদের হাইড্রোক্সাইড গুলাে এসিডের সাথে বিক্রিয়া করে লবণ ও পানি উৎপন্ন করে। এরা আয়নিক বন্ধন গঠন করে।

SSC Chemistry 2nd Week Assignment 2021

SSC candidates have their first assignment in the Chemistry subject in the 2nd Week. Chemistry is determined from the third chapter of the first assignment. The title of the third chapter is the structure of matter. SSC chemistry assignment 2nd week. How a substance is formed and the different states of matter are discussed in this chapter. Thus, from the 2nd-week chemistry assignment of SSC, we will learn about the composition of matter. In order to solve the SSC 2nd week chemistry assignment correctly, one has to acquire detailed knowledge about substances and the basics of matter. chemistry assignment SSC 2021 1st week answer

Otherwise, it is not possible to give the answer to SSC 2nd week chemistry assignment correctly. So before writing the solution or answer of the SSC 2nd week chemistry assignment one must acquire knowledge about the content of the assignment.SSC assignment 2021 2nd week answer

SSC 2nd week assignment answer

We can learn a lot from the chemistry assignment of SSC 2nd Week. For example, we can calculate the number of electrons, protons and neutrons in an atom. Rutherford and Bohr will also be able to describe the atomic model of atomic structure. I can arrange the electrons of the atom in different orbits of the atom and in different layers of the orbit.

assignment SSC 2021 2nd week answer chemistry

মোট নম্বরঃ ১০

অ্যাসাইনমেন্ট নম্বর-০১

অধ্যায় ও অধ্যায়ের শিরােনামঃ তৃতীয়, পদার্থের গঠন।

অ্যাসাইনমেন্টঃ প্রতীকের পাশে উল্লেখিত ভরসংখ্যাবিশিষ্ট মৌলের নিউট্রন সংখ্যা, বাের মডেল অনুসারে পরমাণুর গঠনের চিত্র, শক্তিস্তরে ইলেকট্রন বিন্যাস এবং উপশক্তিস্তরে (অরবিটালসমূহে) ইলেকট্রন বিন্যাস সংশ্লিষ্ট একটি প্রতিবেদন প্রণয়ন।

Na(11), ভরসংখ্যা -23 P(15), ভরসংখ্যা -31 K(19), ভরসংখ্যা -40 Cu(29), ভরসংখ্যা -63

১. পরমাণু ইলেকট্রন, প্রােটন ও নিউট্রন সংখ্যা হিসাব করতে পারব। ২. পরমাণুর গঠন সম্পর্কে রাদারফোর্ড ও বাের পরমাণু মডেলের বর্ণনা করতে পারব। ৩. পরমাণুর বিভিন্ন কক্ষপথ এবং কক্ষপথের বিভিন্ন উপস্তরে পরমাণুর ইলেকট্রনসমূহকে বিন্যাস করতে পারব।

৪টি মৌলের নিউট্রন সংখ্যার হিসাব বের করতে হবে। ৪টি মৌলের বাের মডেল অনুসারে পরমাণুর গঠনের চিত্র অংকন করতে হবে ৪টি মৌলের শক্তিস্তরে ইলেকট্রন বিন্যাস করতে হবে ৪টি মৌলের উপশক্তিস্তরে (অরবিটালসমূহে) ইলেকট্রন বিন্যাস করতে হবে।

অধ্যায় ৩ পদার্থের গঠন

অ্যাসাইনমেন্ট : প্রতীকের পাশে উল্লেখিত ভরসংখ্যাবিশিষ্ট মৌলের নিউট্রন সংখ্যা, বোর মডেল অনুসারে পরমাণুর গঠনের চিত্র, শক্তস্তরে ইলেকট্রন বিন্যাস এবং উপশক্তিস্তরে (অরবিটালসমূহে) ইলেকট্রন বিন্যাস সংশ্লিষ্ট একটি প্রতিবেদন প্রণয়ন।

(ক) নিউট্রন সংখ্যা হিসাব : Na মৌলের নিউট্রন সংখ্যা =23−11=12 P মৌলের নিউট্রন সংখ্যা =31−15=16 K মৌলের নিউট্রন সংখ্যা =40−19=21 Cu মৌলের নিউট্রন সংখ্যা =63−29=34

বোর মডেল অনুসারে পরমানুর গঠনের চিত্র অঙ্কন :

𝑁𝑎Na এর ইলেকট্রন বিন্যাস-

(গ) শক্তিস্তরে ইলেকট্রন বিন্যাস

উপশক্তিস্তরে (অরবিটাল সমূহে) ইলেকট্রন বিন্যাস –

আমরা জানি, n=1 এর জন্য উপশক্তিস্তর ০ থেকে (n−1) পর্যন্ত। তাই প্রথম শক্তিস্তরে একটি উপশক্তিস্তর বিদ্যমান =1𝑠 𝑛=2 হলে, উপশক্তিস্তর হল = 2𝑠, 2p n=3 হলে, উপশক্তি স্তর হল = 3𝑠, 3p, 3d n=4 হলে, উপশক্তি স্তর হল = 4s, 4p, 4d, 4f

s উপশক্তিস্তরে থাকে সর্বোচ্চ ২টি ইলেকট্রন। 𝑝 উপশক্তিস্তরে থাকে সর্বোচ্চ ৬টি ইলেকট্রন। d উপশক্তিস্তরে থাকে সর্বোচ্চ ১০টি ইলেকট্রন। f উপশক্তিস্তরে থাকে সর্বোচ্চ ১৪টি ইলেকট্রন।

পরমাণুর অরবিটালের ক্রমবর্ধমান শক্তিগুলো : 1𝑠 <2𝑠 <2𝑝 <3𝑠< 3𝑝 <4𝑠 <3𝑑

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