(a) How does the rate of reaction depend upon the concentration of reactants ?

Explanation

(1)When the reactant combines with two or more other reactants then the rate of a chemical reaction depends on the nature of the reactants .
(2) Both AI and Zn reacts with dilute hydrochloric acid, `H_(2)` gas is liberated and water soluble salts of these metals are formed . However, aluminium metal reacts faster with dil. HCI as compared to zinc metal.
(3) Al is more reactive than Zn. Therefore, the rate of reaction of AI with hydrochloric acid is higher than that of Zn. Hence, the nature of the reactant affect the rate of a reaction.
` 2AI + uderset("dil")(3HCI) overset("fast")to 2AICI_(3) + 3H_(2) uarr`
` Zn + 2HCI to ZnCI_(2) H_(2)uarr `