Some apparatus and chemicals are given.
Zn, Mg, dilute HCl, 'CaCO_3', test tube, water
a) Design an experiment to prove that the nature of reactants can influence the rate of reaction.
Write the equations for the chemical reactions.
Write the expression for the rate of the reaction.

Explanation

a) Materials required:
Zn , Mg, dilute HCl, Test tube
Procedure: Take equal amounts of dilute HCl in two test tubes. Put a small piece of Mg in one test tube. Put a piece of Zn in another test tube with same size of Mg.
Observation: Reaction takes place faster in the test tube in which Mg is taken.
b) . Mg + 2HCl rarr MgCl_2 + H_2.
.Zn + 2HCl rarr ZnCl_2 + H_2.
c) .Rate of chemical reaction = frac{Amount of reactants get consumed}{Time taken for the consumption of the reactants}
. Rate of chemical reaction = frac {Amount of products formed}{Time taken for the formation of the product}