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The graph below shows a curve obtained when water at 20℃ was heated for 15 mins.
         graph showing a curve when water is heated

  1. What happens to the water molecules between points W and X 
  2. In which part of the curve does a change of state occur?
  3. Explain why the temperature does not rise between points X and Y 

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  1. Water molecules gain energy and move faster
  2. XY
  3. Supplied energy is used to break bonds between water molecules in liquid state and become free molecules in gaseous state
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