1. The number of particles in one mole of a substance is called:

2. Piece of matter in pure form is called:

3. The branch of chemistry which deals with the study of all elements and their compounds except compounds of carbon and hydrogen and their derivatives is called.

4. One mole of any material contains chemical units equal to:

5. Which one of the followings shows the simplest whole number ratio of atoms in a substance?

6. Which one of the followings is the mixture of oxygen, nitrogen and carbon dioxide?

7. The unique property of an element is called:

8. Anything that has mass and occupies space is called:

9. An atom or group of atoms having odd number of electrons is called:

10. The sum of atomic masses of all the atoms in one formula unit of a substance is called: