7th Grade Thermal Energy Unit Review

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Across
  1. 1. The transfer of thermal energy
  2. 3. Type of energy that is the energy of motion
  3. 4. the total kinetic energy of the particles that make up a substance
  4. 7. Type of energy that is stored energy
  5. 9. most substances do this as their temperature increases
  6. 10. state of matter in which particles are closely spaced and vibrate in a fixed position.
  7. 15. space that contains little or no matter
  8. 16. temperature scale used in the metric system (pretty much the rest of the world)
  9. 17. warmer particles rise up because they are less _____
  10. 18. state of matter in which particles are moving very quickly and spaced far apart
  11. 20. convection current in the atmosphere
  12. 21. the particles that make up a substance are always _____
  13. 22. the temperature difference between two objects affects the _____ of heat transfer
  14. 24. atoms or molecules
  15. 25. heat only flows in one direction - from the _____ substance
  16. 27. high temperatures mean ____ kinetic energy
  17. 28. temperature scale used in the US
  18. 29. the substance that has a unique property of expanding when freezing
  19. 31. refers to gasses and liquids, not solids
  20. 32. theoretical temperature at which the particles of a substance have NO kinetic energy
  21. 33. substances do this when their temperatures decrease
  22. 34. heat only flows in one direction - to the _____ substance
Down
  1. 2. a device that regulates the temperature of a system
  2. 4. The average kinetic energy of the atoms or molecules within a substance.
  3. 5. the best conductors are usually these
  4. 6. a substance that transfers thermal energy quickly
  5. 8. transfer of thermal energy by currents (warmer particles rise, cooler particles sink)
  6. 9. heat transfer stops when substances in contact with each other are at the same temperature, or thermal _____
  7. 11. state of matter in which particles are sliding around each other but still touching
  8. 12. transfer of thermal energy between materials because of collisions between particles
  9. 13. a substance that transfers thermal energy slowly
  10. 14. a source of thermal energy within the Earth
  11. 19. The process when matter loses thermal energy and changes from a gas to a liquid
  12. 23. transfer of thermal energy from one material to another by electromagnetic waves
  13. 26. a tool used to measure temperature
  14. 30. this water had the slowest rate of diffusion