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

1.

Atoms and molecules

1.	Atom, molecule and element Difficulty: easy	1
2.	Dalton's atomic theory Difficulty: easy	1
3.	Atomic mass Difficulty: easy	1
4.	Atomicity Difficulty: easy	2
5.	Identification of chemical compounds Difficulty: medium	3
6.	Matching atoms and symbols Difficulty: medium	3
7.	Writing Chemical Formulae Difficulty: medium	5.5
8.	Formula unit mass Difficulty: medium	2
9.	Application of law of constant proportions Difficulty: hard	3
10.	Law of conservation of mass Difficulty: hard	5

1.

Methodical recommendation

Annual Revision VI - Atoms and molecules