Why does a higher concentration increase the rate of reaction?

Question

a
It increases the surface area of the particles
b
It decreases the amount of reactants.
c
It increases the frequency of collisions.
d
It lowers the activation energy.

Answer 1

The correct answer is:

c It increases the frequency of collisions.

A higher concentration of reactants means that there are more particles in a given volume. This leads to an increase in the number of collisions between reactant particles, which in turn increases the rate of reaction. More collisions can lead to more successful reactions, provided that the collisions have sufficient energy to overcome the activation energy barrier.