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Dekalb Reads Assignment 2.2B

Energy’s Role

Read pages 48-52 and answer the questions.

 

  1. Define energy.
  2. What happens when the atoms gain energy?
  3. Describe the energy changes in your body when you feel a breeze after you have been perspiring.

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  4. Why are bubbles formed when a liquid is heated?
  5. What happens to energy when liquid water freezes to ice?
  6. What is sublimation?
  7. Why do ice cubes get smaller when they are left in the freezer for a couple of months?
  8. Does changing state change the composition or mass of a substance?
  9. What actually changes during the change of state from solid to liquid and liquid to gas?
  10. Will the mass of steam be same as the mass of the liquid water?
  11. Write down the law of conservation of mass.
  12. Write down the law of conservation of energy.
  13. Does a car use all the energy from gasoline?
  14. What happens to the energy produced by gasoline?
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