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Energy & Heat Review

Energy & Heat Review. 1. 4. 2. 1. 3. B. Does not emit as much pollution, does not burn fossil fuels…. 4. 4. 1. 5. 6. 1. 3. 7. 4. Heat, electrical. 8. 4. 9. 2. 10. 11. 3. 2. 12. 3. 13. Kinetic or mechanical. 14. 2. 15.

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Energy & Heat Review

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  1. Energy & Heat Review

  2. 1 4 2 1

  3. 3 B Does not emit as much pollution, does not burn fossil fuels…

  4. 4 4 1

  5. 5 6 1 3

  6. 7 4 Heat, electrical

  7. 8 4 9 2

  8. 10 11 3 2

  9. 12 3

  10. 13 Kinetic or mechanical

  11. 14 2

  12. 15 Pull the arrow back a little more before releasing it, use a lighter arrow…

  13. 16 Student B has a greater height. As they enter they water they slow down, so KE decreases.

  14. 17 Generates electricity without pollution. Takes up a lot of space, may affect organisms that live in the water, costs a lot of money to build

  15. 18 1 19 4

  16. 20 4 21 2

  17. 22 4 23 3 24 4

  18. 25 Once they are used up, they are no longer available because they take millions of years to form. Releases pollutants into the air, releases carbon dioxide into the air which leads to global warming. Using solar energy, wind energy, hydroelectricity…

  19. 26 2 27 2

  20. 28 Burning fossil fuels when driving cars or generating heat in homes.

  21. 29 They do not release pollutants in to the air or carbon dioxide. They take up a lot of space, they can affect birds, if there is no wind, electricity cannot be generated.

  22. 30 3

  23. 31 There are more cars being used. There are more homes being built. Install more wind turbines, install solar cells on buildings and homes.

  24. 32 liquid gas Oil, natural gas

  25. 33 4

  26. 34 sun Driving car, heating home, using barbeque Solar energy, biomass chemical mechanical

  27. 35 1 36 2

  28. 37 3

  29. 38 yes no no no yes yes 3 2 1

  30. 39 2 40 4

  31. 41 Tightly packed together, side by side, in rows They should slowly start to move away from each other. They should start to move a little faster, sliding past each other.

  32. 42 Evaporation or boiling Melting or condensation

  33. 43 2

  34. 44 condensation melting Evaporation Its less dense than the water

  35. 45 It is less dense than the water It dissolved in the water. Use a strainer, or filter paper to separate the mixture.

  36. 46 1 47 3

  37. 48 3 49 3

  38. 50 2

  39. 51 solid liquid

  40. 52 2 53 1

  41. 54 1

  42. 55 4 2

  43. 56 The metal expanded when it was heated because the molecules moved faster and farther apart.

  44. 57 The ball is still made of the same material, and remained the same shape. The ball expanded and changed in size but not in composition. The ball is still made of the same type of metal. Composition did not change.

  45. 58 Cool it down by placing it in cold water. As temperature increases, the speed of the molecules also increases.

  46. 59 2 60 1

  47. 61 Temperature Surface area/size of the particles of sugar

  48. 62 Use filter paper or a strainer to separate the mixture. Evaporate the water by heating it up.

  49. 63 3

  50. 64 salt sand water The substances are physically combined. They did not change into a new substance. The water evaporated.

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