(a) Mention the four types of information given by an equation. (b) State the law of conservation of mass as applicable in a chemical reaction.

(a) The four types of information given by an equation are:

i. There are three different states which are solid, liquid and gaseous. If the substance exists in the solid state, it is represented by (s).

ii. If the substance exists in the aqueous state, it is represented by (aq).

iii. If the substance exists in the gaseous state, it is represented by (g).

For example:

iv. If the gas is liberated in a reaction, it is indicated by an arrow upward, and its physical state is shown by (g).

For example:

(b) According to the law of conservation of mass, atoms are neither created nor destroyed in chemical reactions.

It means the total mass of the products formed in a chemical reaction must be equal to the mass of reactants consumed.