What I have Learned
From the activities given let us see how far you were able to grasp that
information about the rate of chemical reaction. Answer the following questions.
1. Why does increasing temperature, increasing concentration and decreasing
particle size speed up a chemical reaction? Use collision theory to explain your
answer.

Increasing the temperature of a reaction increases the kinetic energy of the particles which increases the number of collisions so the reaction rate increases. ... Smaller reactant particles provide a greater surface area 1 which increases the chances for particle collisions so the reaction rate increases

Answer Link