10th Science Chemistry Assignment Answers 2021 TN SCERT Full Answer Key

Dear Teachers Send Your Study Materials, Question Papers & Answers to  kalvisri.education@gmail.com 
Whatsapp 8778711260 

10th Science | Chemistry 

Unit 7 Atoms and Molecules

Assignment Answers 2021

TN SCERT Full Answer Key 

10th Science Assignment Answers. 10th Science TN SCERT Assignment Answers, 10th Science Unit 1 TN SCERT Answer key 2021. 10th Standard All Subject TN SCERT Assignment Unit 1 Answers. TN SCERT Announced 1st to 12th All Subject Assignment Worksheets for Unit 1. Students Can Note that 10th science Unit 1 TNSCERT Assignment.  10th Assignment Answers, 9th Tamil Assignment Answers download PDF. 9th Maths Assignment Answers Unit 1 TNSCER Tamil Medium and English Medium.  

Click Here to Download KALVI IMAYAM POCKET GUIDE Mobile Application

9th Maths Assignment Answers

• 9th Tamil Assignment Answers TN SCERT

• 9th Maths Assignment Answers TN SCERT 

10th Standard Science Unit 1 TN SCERT Assignment Answer key.

 

• Download 9th TN SCERT Assignment PDF

10th Assignment Answers TN SCERT

• 10th Tamil Assignment Answers TN SCERT

• 10th English | PROSE Assignment Answers TN SCERT 

• 10th English | POEM Assignment Answers TN SCERT 

• 10th English | SUPPLEMENTARY Assignment Answers TN SCERT 

• 10th Maths Assignment Answers TN SCERT

• 10th Science | PHYSICS  Laws of motion Assignment Answers TN SCERT
• 10th Science | CHEMISTRY Atoms and Molecules Assignment Answers TN SCERT
• 10th Science | BIOLOGY Assignment Answers 2021 TN SCERT Full Answer Key 

• 10th Social Science | HISTORY Assignment Answers TN SCERT

• 10th Social Science | GEORRAPHY Assignment Answers TN SCERT
• 10th  Social Science | CIVICS Assignment Answers TN SCERT

10th Science TN SCERT Unit 1 Answers

 Assignment

• Class:10

• 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 17Cl³⁵, 17Cl³⁷ 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 ________.

a) 6

b) 12

c)24

d) 18

 4. The mass of 5 moles of sodium is -------------

a) 46g b)

 34g

c) 105g

d) 115g

5. Number of atoms present in 3 moles of iron is--------

a) 6.023 x 10²³

b) 18.069 x 10²³

c) 12.046 x 10²³

d) None

 

Part - B

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”

The salient features of “Modem atomic theory” are,

• 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].