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Energetics & Rates

Energetics & Rates

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Energetics & Rates

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  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. 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 Decompositionof Hydrogen Peroxide?

  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. 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.