Question

an increase in temperature will cause an increase in diffusion rate because
multiple choice
the frequency and force of molecular collisions increases.
hot molecules get smaller and therefore diffuse faster.
hot water changes to a solid, so diffusion is easier.
hot water is thinner than cold water.

Explanation:

Temperature is a measure of the average kinetic energy of molecules. When temperature increases, molecules move faster, leading to more frequent and forceful collisions. This enhances the diffusion rate. Molecules don't change size due to temperature, hot water doesn't turn to solid with an increase in temperature, and the concept of "thinness" isn't relevant here.

Answer:

the frequency and force of molecular collisions increases.