1. Energetics & Rates
GCSE REVISION

2. 1. What is the Minimum Amount of Energy needed for a Reaction called?
Activation Energy

3. 2. Give three ways of Increasing the Rate of a Reaction.
Increase concentration
Increase temperature
Increase surface area
Use a catalyst
(any three)

4. 3. What happens if you Increase the Temperature?
Particles gain kinetic energy
Particles move faster
More successful collisions
Faster rate of reaction

5. 4. What happens if you Increase the Concentration?
More particles present
Greater chance of successful collision
Faster rate of reaction

6. Speeds up a chemical reaction without being used up itself
5. What is a Catalyst?
Speeds up a chemical reaction without being used up itself

7. 6. Write the Equation for the Decomposition of Hydrogen Peroxide.
Hydrogen Peroxide Water + Oxygen

8. Manganese dioxide (catalyst) Liver or potato (enzyme)
7.What Catalyst/ enzyme is used for the Decomposition of Hydrogen Peroxide?
Manganese dioxide (catalyst)
Liver or potato (enzyme)

9. 8. What does Exothermic mean?
Chemical reaction which gives out heat energy

10. 9. How is Activation Energy shown on an Energy Level Diagram?
As a hill.

11. The following questions are Higher Tier only

12. a) One which dissociates (breaks up) fully into ions when aqueous
11. Why is the heat energy given a negative sign for an Exothermic Reaction?
a) One which dissociates (breaks up) fully into ions when aqueous
b) HCl (aq) H2SO4 (aq)

13. 12. Draw an energy profile diagram for an endothermic reaction.