Annual Revision V - Atoms and molecules. Chemistry CBSE Live product, Class 9 (2025-26): lessons, tests, tasks.

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Atoms and molecules

1.	Atomic theory Difficulty: easy	2
2.	Law of definite proportions Difficulty: medium	2
3.	Atomicity Difficulty: easy	1
4.	Law of conservation of mass Difficulty: medium	3
5.	Find the atomic mass Difficulty: medium	3
6.	Classification of molecules: Drag & drop Difficulty: medium	6
7.	Symbols of atoms of different elements Difficulty: easy	6
8.	Identifying chemical formulae of compounds Difficulty: medium	3
9.	Cations and anions Difficulty: hard	3
10.	Molecular mass Difficulty: medium	2

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Methodical recommendation

Annual Revision V - Atoms and molecules