Question

why does a higher concentration increase the rate of reaction? (1 point)
it decreases the amount of reactants.
it lowers the activation energy.
it increases the surface area of the particles
it increases the frequency of collisions.

Explanation:

In a chemical reaction, reactant particles need to collide to react. Higher concentration means more reactant particles in a given volume, increasing the frequency of collisions between them. More collisions lead to a higher reaction - rate.

Answer:

It increases the frequency of collisions.