C8.4 The Effect Of Concentration Or Pressure

Question 1

What happens to the rate of reaction when the concentration of reactants in solution is increased?

Answer 1

The rate of reaction increases due to an increase in the frequency of collisions.

This is based on collision theory, which states that reaction rates depend on the frequency of collisions between reactant particles.

Question 2

How does increasing the pressure of reacting gases affect the rate of reaction?

Answer 2

It increases the rate of reaction by increasing the frequency of collisions.

Higher pressure reduces the volume available to gas molecules, leading to more frequent collisions.

Question 3

What is the effect of decreasing the concentration of reactants in solution on the rate of reaction?

Answer 3

The rate of reaction decreases due to a decrease in the frequency of collisions.

Lower concentration means fewer reactant particles are available to collide.

Question 4

What effect does decreasing the pressure of reacting gases have on the rate of reaction?

Answer 4

It decreases the rate of reaction by decreasing the frequency of collisions.

Lower pressure allows gas molecules to spread out, resulting in fewer collisions.