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6. A reaction is endothermic when ...

  • Energy to break bonds = Energy to make bonds
  • Energy to break bonds > Energy to make bonds
  • Energy to break bonds < Energy to make bonds

7. An electron-exchange column is used to remove hardness from water.

  • False
  • True

8. What colour precipitate is formed when Fe3+ is added to sodium hydroxide?

  • Blue
  • White
  • Brown
  • Yellow
  • Green

9. Why are catalysts used?

  • To increase the activation energy needed
  • To reduce the activation energy needed
  • To lower the reactants' energy
  • To slow the reaction down
  • To increase the reactants' energy