Topic 10 - Making Electricity

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Anonymous
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76726
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Topic 10 - Making Electricity
Updated:
2011-04-02 09:27:00
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Chemistry Making Electricity
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Standard Grade Chemistry - Topic 10 - Making Electricity
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  1. Batteries are a store of chemical energy which can be converted into _________ energy?
    electrical
  2. What takes place when a battery supplies electricity?
    A chemical reaction
  3. What is electricity?
    A flow of electrons along a metal wire
  4. What kind of batteries are rechargable?
    lead/acid and nickel/cadmium
  5. The conducting substance which connects and completes the ciruit is called the...?
    electrolyte
  6. Give an example of an electrolyte
    Ammonium chloride
  7. Why must an electrolyte be in solution or in a paste?
    As the ions are only free when to move in solution and not when solid
  8. In a cell different pairs of metals give different _________ readings?
    voltage
  9. What kind of reaction takes place when atoms of a metal higher in the electrochemical series are added to a solution of ions of a metal lower in the electrochemical series?
    A displacement reaction
  10. During a displacement reaction the atoms of the metal higher in the electrochemical series ____ electrons forming postive ions in solution?
    lose
  11. During a displacement reaction the atoms of the metal lower in the electrochemical series _____ electrons forming atoms of the metal?
    gain
  12. Why is an ion bridge needed in a cell?
    To complete the circuit and allow ions to flow between the two halves of the cell
  13. An oxidation reaction involves a ____ of electrons?
    loss (OIL - Oxidation Is Loss)
  14. A reduction reaction involves a ____ of electrons?
    gain (RIG - Reduction Is Gain)
  15. A metal element reacting to form a compound is an example of ______?
    oxidation
  16. A compound reacting to form a metal element is an example of ______?
    reduction
  17. Oxidation and reduction reactions together are called a....?
    Redox reaction
  18. What are the advantages of using batteries instead of mains electricity?
    • Easier to move
    • Less Dangerous
  19. What are the disadvantages of using batteries of mains electricity?
    • More expensive
    • Have to be replaced

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