Question

i) Write the chemical formulas of:
Sodium oxide
Water
ii) Calculate the molecular mass of:
MgO
HCl
iii)List two differences between a physical change and a
Chemical change

Answer 1

Explanation:

1 - Na2O + H2O --> NaOH.

3- The difference between a physical reaction and a chemical reaction is composition. In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition.

Answer 2

Answer:

Explanation:

iii) List two differences between a physical change and a

Chemical change

physical :new substance are fromed