Vidaara.orgClass 9 · Chemistry
CodeC9-CHEM-3-CW
Atoms and Molecules — Chapter Worksheet
Name: ____________________
Roll No.: __________
Date: ____________
General Instructions
- All questions are compulsory.
- Use N_A = 6.022×10²³ and atomic masses H = 1, C = 12, N = 14, O = 16, Na = 23, S = 32, Cl = 35.5, Ca = 40.
- Show all working for the numerical questions.
Section A (1 mark each)
6 × 1 = 6 marks
1.
2.
3.
4.
5.
6.
Section B (2 marks)
4 × 2 = 8 marks
7.
8.
9.
10.
Section C (3 marks)
2 × 3 = 6 marks
11.
12.
Section D (5 marks)
2 × 5 = 10 marks
13.
14.
Answer Key
Section A (1 mark each)
Section B (2 marks)
Section C (3 marks)
Section D (5 marks)
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