Question

(b) Is crystallization is reversible change? Give reasons for your answer.
(c) Write one example of Monatomic and Tetratomic molecule.
Question based on activity​

Answer 1

Explanation:

(b) It cannot be reversed. Hence, it is a chemical change. (ii) Crystallization of a substance is a physical change because there is no change in composition and chemical properties of the substance.Monoatomic molecule: Argon, helium, radon. Diatomic molecule : Hydrogen, Nitrogen, Oxygen. Triatomic molecule:Ozone. Tetra-atomic molecule: Phosphorus.

Answer 2

Explanation:

1.Helium (He)

2.Oxygen(o2)

3.Ammonium(NH4)