Give an example of each of the following chemical changes.

(a) A reaction involving

(i) change of state

(ii) formation of a precipitate

(b) An exothermic and an endothermic reaction involving carbon as one of the reactants.

(c) A reaction where colour change is noticed.

What is a chemical change? Give two examples of a chemical change?

Why is energy involved in a chemical change?

A metal X (used for galvanization) is immersed in the aqueous solution of a blue salt YSO₄. Metal Y is deposited on the surface of the solution and a strip of metal X dissolves.

(a) Predict the metal X.

(b) What type of reaction is it?

(c) Write the word equation for this reaction and balance it.