When zinc granules react with dilute sulphuric acid, a displacement reaction takes place leading to the formation of zinc sulphate and hydrogen gas. The balanced chemical equation for the reaction is:
$$Zn_{(s)} + H_2SO_{4(aq)} \rightarrow ZnSO_{4(aq)} + H_{2(g)}$$
The hydrogen gas produced can be observed as bubbles. The reaction is classified as a chemical change because a new substance, zinc sulphate, is formed.
