3.1.2 Effect of Concentration

Question 1

What are the factors that can alter the rate of reaction?

Answer 1

• Concentration/pressure
• Temperature
• Catalyst
• Surface area.

Question 2

For a chemical reaction to occur, reacting particles must:

Answer 2

• Collide with each other.
• Collide with energy that is equal or greater than the activation energy.

Question 3

Define effective collisions.

Answer 3

• Collisions that result in the formation of products.

Question 4

Is the concentration low or high when the reactant particles are spread apart?

Answer 4

• Low concentration.

Question 5

Is the concentration low or high when there are more particles in the same volume?

Answer 5

• High concentration.

Question 6

What happens to the particles when the solution is more concentrated?

Answer 6

• More particles occupying a given volume.
• Collisions between particles are more frequent.
• Effective collisions are more frequent.
• Higher speed of reaction.

Question 7

If the concentration of the reactant is increased, what else increases?

Answer 7

• Speed of reaction.

Question 8

How do you investigate the effect of concentration on speed of reaction?

Answer 8

• Measure the volume of hydrogen formed at regular intervals.
• Repeat using HCl of a different concentration.

Question 9

If the gradient is steeper, does the speed of reaction increase or decrease?

Answer 9

• Increase.

Question 10

Describe and explain the effect of increasing concentration on rate of reaction?

Answer 10

• Increasing the concentration increases the rate.
• There are more particles in a given volume, which increases the frequency of collisions.