Question

how does increase in concentration of the reactants on the surface increases the rate of reaction?

Answer 1

Dear student,
On increasing the concentration of reactants generally increases the rate of reaction because the more number of reacting molecules increases and collisions between the reactant molecules increases and the rate of reaction increases.
​​​​​​ Some molecules have effective collisions but some molecules have ineffective collisions but as the concentration increases the number of effective collisions increases and from the frequency which they collide with other molecules will also increases. As the frequency of effective collisions increases faster they will form the products.Faster they will form the products faster will be rate of reaction.

Regards