Energetics & Rates GCSE REVISION.

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Presentation transcript:

Energetics & Rates GCSE REVISION

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

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

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

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

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

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

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)

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

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

The following questions are Higher Tier only

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)

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