Science 7 ch 4-6

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Across
  1. 4. no fixed shape or size they can be compressed easily and they expand to fill all parts of their container
  2. 6. fixed sized and volume but takes on the shape of its container and can not be compressed easily
  3. 8. good conductors of heat
  4. 10. all particles have enough energy to go from liquid to gas
  5. 14. When a fluid is heated, it gains energy and becomes warm. The warm fluid is less dense, so it rises. As it rises, it loses heat and cools down. The cooler fluid becomes more dense and sinks back down toward the heat source. This movement is called a ______.
  6. 15. transfer of energy without any movement of matter
  7. 17. fixed shape fixed size and volume and can not be compressed
  8. 18. poor conductors of heat heat and cool slowly trap heat
  9. 19. the hidden energy absorbed or released by a substance during a change of state, without changing its temperature.
  10. 23. energy source that supplies energy to the rest of the system, direction of energy transfer for high to low, energy transforms as it's transferred, waste of heat almost all of them emit thermal energy to its surroundings although some can be prevented by insulators.
  11. 24. good insulators
  12. 25. what changes when substances change states
  13. 26. amount of thermal energy that warms or cools an object by 1 degree celcius
Down
  1. 1. transfers heat energy quickly heats up and cools quickly
  2. 2. higher energy particles vapourize leaving the cooler less energy particles left thus making the liquid cooler that it was this helps cooling on a surface
  3. 3. what doesn't change when substances change states
  4. 5. 3 ways that energy can be transfered
  5. 7. amount of thermal energy that warms or cools a gram of a material by 1 degree celcius
  6. 9. transfer of energy through direct contact/collisions
  7. 11. travels in the form of a wave goes up to 300,000 km/s goes through and empty space, air and glass and e.t.c can be reflected and absorbed by objects
  8. 12. transfer of energy through fluids
  9. 13. 3 states of matter
  10. 16. only some surface molocuels have enough energy to go from liquid to gas
  11. 20. when gas is heated so much that the electron start to break from the atoms and there will be lone electrons
  12. 21. an example of when solids aren't the mosh=t contracted state
  13. 22. can exist in all 3 states of matter has nothing added to it no additions