3b. Rates of reaction

Question 1

Rate of reaction =

Answer 1

amount of reactant used or amount of product formed / time

Question 2

What can incerase the rate of reaction?

Answer 2

• Increasing the surface area of a solid increases the rate of a reaction.
• Increasing the concentration of a solution increases the rate of a reaction.
• Increasing the pressure of a gas increases the rate of a reaction.
• Increasing the temperature increases the rate of a reaction.
• Using a catalyst increases the rate of a reaction.

Question 3

What happens when you increase the surface area in a solid

Answer 3

• more particles exposed
• more frequent collisions
• increase the rate of a reaction

Question 4

Increasing the concentration of a solution or pressure of a gas

Answer 4

• more particles in same space
• more frequent collisions
• increase rate of reaction

Question 5

Increasing the temperature

Answer 5

• Particles have more kinetic energy
• More frequent collisions
• A higher proportion of those collisions are successful because the collision energy is greater or equal to the activation energy
• Increase rate of reaction

Question 6

What is a catalyst?

Answer 6

A substance that increases the rate of a reaction, but is chemically unchanged at the end of the reaction

Question 7

How does a catalyst speed up a reaction?

Answer 7

By providing an alternative pathway with lower activation energy