18 - Rates of Reaction

Question 1

What is The Rate of Reaction?

Answer 1

The speed at which reactants are turned into products

Question 2

How can we control the rates of reactions?

Answer 2

By altering variables

e.g. Concentrations of solutions or the sizes of reactants

Question 3

Name 4 factors that affect the Rate of Reaction:

Answer 3

• Temperature
• Surface area
• Pressure of gases
• Temperature

Question 4

Explain why increasing Temperature INCREASES the rate of reaction

Answer 4

• Particles have more Kinetic energy
• Collisions occur more frequently
• Increases successful collisions
• Therefore, rate of reaction will ⬆️

Question 5

Explain why increasing Concentration INCREASES the rate of reaction

Answer 5

• More reacting particles in the same volume
• Collisions occur more frequently
• Increases successful collisions
• Therefore, rate of reaction will ⬆️

Question 6

Explain why increasing Surface area INCREASES the rate of reaction

Answer 6

• More surface for the collisions to occur on
• Collisions occur more frequently
• Increases successful collisions
• Therefore, rate of reaction will ⬆️

e.g. Powdered marble are bigger than marble chips

Question 7

Explain why increasing Pressure of Gases INCREASES the rate of reaction

Answer 7

• Reactant particles are squeezed together
• Collisions occur more frequently
• Increases successful collisions
• Therefore, rate of reaction will ⬆️

Question 8

What is the Activation energy?

Answer 8

The minimum amount of energy needed for a reaction to occur

Question 9

What is a Catalyst?

Answer 9

Substances that speed up chemical reactions without permanently being changed themselves