Chemistry 2 Unit 4

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Author:
Rvynvega
ID:
219077
Filename:
Chemistry 2 Unit 4
Updated:
2013-05-11 14:08:31
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triple
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Description:
Rates and energy
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  1. How can the rate of a chemical reaction be found?
    • Amount of reactant used➗time
    • OR
    • amount of product formed➗time
  2. What's the only way chemical reactions take place?
    Chemical reactions can only occur when reacting particles collide with each other with the sufficient energy
  3. What is meant by activation energy?
    This is the minimum amount of energy particles need to react
  4. What factors can increase the chance of collision (rate of reaction)? (TCPSC)
    • Increasing:
    • Temperature
    • Concentration of solutions
    • Pressure of gasses
    • Surface area of solids
    • Catalyst
  5. How does increasing the surface area increase the rate of reactions?
    Increasing the surface area of solid reactants increases the frequency of collisions
  6. How does increasing the temperature increase the rate of reactions?
    Increasing the temperature increases the speed of the reacting particles so they collide more frequently and energetically
  7. How does increasing the pressure increase the rate of reactions?
    Increasing the pressure of reacting gasses increase the frequency of collisions
  8. How does increasing the concentration increase the rate of reactions?
    Increasing the concentration of reactants in solutions increase the frequency of collisions
  9. How does using a catalyst increase the rate of reactions?
    Catalysts change the rate of chemical reactions but are not used up during the reaction
  10. Why are catalysts important in industrial processes?
    To reduce the cost
  11. What is meant by an exothermic reaction?
    This is when heat energy is release and the surroundings become hotter and the temperature rises
  12. What is meant by an endothermic reaction?
    This is when heat energy is taken from the surroundings and the surroundings become colder the temperature decreases
  13. Give an example of an exothermic reaction and everyday uses?
    • Combustion
    • Oxidation
    • Neutralisation
    • Hand warmers
  14. Give an example of an endothermic reaction and an everyday use?
    • Thermal decomposition
    • Cold packs
  15. How does Exo/endothermic reactions relate to reversible reactions?
    One way is exothermic the other is endothermic the amount of energy is exactly the same for each one

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