Chemistry 3 Unit 3

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Author:
Rvynvega
ID:
220120
Filename:
Chemistry 3 Unit 3
Updated:
2013-05-18 08:43:13
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triple
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Description:
Energy calculations
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  1. What is a calorimeter?
    This is a process used to measure the amount of energy released even substances burn
  2. Give an example of simple calorimeter
    Heating water in a glass beaker/ metal container
  3. What does the temperature rise depend on when water is heated?
    The temperature rise depends on the amount if energy released
  4. How is the amount of energy transferred calculated?
    Q = mcπŸ”ΊT

    • Q = The amount if energy transferred in Joules J
    • M = mass of water in grams g
    • C = the specific heat capacity J/gβ€’c
    • πŸ”ΊT = Temperature change β€’c
  5. Why do simple calorimeters not give accurate results?
    Much of the energy is used to heat the surroundings
  6. How can we reduce the energy transfer to the surroundings?
    Do the reaction in an insulated container
  7. How are neutralisation and displacement reactions calculated?
    Q = mcπŸ”ΊT

    • Q = The amount if energy transferred in Joules J
    • M = mass of water in grams g
    • C = the specific heat capacity J/gβ€’c
    • πŸ”ΊT = Temperature change β€’c
  8. If we assume the solutions behave like water what is the mass and specific heat capacity?
    1cm''' of a solution is 1g and the specific heat capacity of the solution is 4.2J/gβ€’c
  9. What must happen to reactants for the reaction to take place?
    • During a chemical reaction bonds in the reactant must be broken for the reaction to happen
    • Energy is released when bonds are formed
  10. What is the activation energy?
    This is the minimum energy required for the reaction to happen
  11. Draw an energy level diagram for an exothermic reaction
    • Reactant
    • _______
    • πŸ’­πŸ’­πŸ’­πŸ’­|
    • πŸ’­πŸ’­πŸ’­πŸ’­| Energy released
    • πŸ’­πŸ’­πŸ’­πŸ’­|
    • πŸ’­πŸ’­πŸ’­πŸ’­|______
    • πŸ’­πŸ’­πŸ’­πŸ’­Products
  12. Draw an energy level diagram showing the activation energy as well as the use of catalyst for an exothermic reaction
    • πŸ’­πŸ’­πŸ’­πŸ’­Activation energy
    • πŸ’­πŸ’­πŸ’­πŸ’­πŸ’­ ^
    • πŸ’­πŸ’­πŸ’­πŸ’­πŸ’­| |
    • ReactantπŸ’­ |^| catalyst
    • _________|πŸ’­|
    • πŸ’­πŸ’­πŸ’­πŸ’­πŸ’­πŸ’­ |
    • πŸ’­πŸ’­πŸ’­πŸ’­πŸ’­πŸ’­ |_____
    • πŸ’­πŸ’­πŸ’­πŸ’­πŸ’­πŸ’­Products
  13. What does a catalyst do to the reaction and activation energy?
    Catalysts increase the rate of reaction and lower the activation energy
  14. In an exothermic reaction what is the relationship between the energy released from forming bonds and the energy needed to break bonds?
    In an exothermic reaction, the energy released from forming bonds, is greater than the energy needed to break bonds
  15. In an endothermic reaction what is the relationship between the energy released from forming bonds and the energy needed to break bonds?
    In an endothermic reaction, the energy needed to break bonds, is greater than the energy released from forming bonds
  16. What's the advantages of using hydrogen for fuel?
    • Hydrogen can be produced from renewable sources
    • Hydrogen burns easily and releases a large amount of energy per gram
    • It doesn't produce Carbon dioxide when burned
  17. What is the disadvantage of using hydrogen for fuel?
    • Supply, storage, safety problems
    • It's costly to match the performance, convenience and cost of petrol and diesel vehicles

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