Physical vs. Chemical Changes

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Across
  1. 2. when a chemical change cannot go back to its original form
  2. 4. a chemical change might _________ energy in the form of heat, light, or sound
  3. 6. when a substance changes into a new substance. usually irreversible.
  4. 7. when a gas loses enough energy to turn into a liquid
  5. 10. many atoms of different elements combine to make these.
  6. 11. when a liquid gains enough energy to turn into a gas
Down
  1. 1. when a liquid loses enough energy to turn into a solid
  2. 3. a characteristic of physical changes, meaning they can be undone
  3. 5. when a substance alters its appearance or state of matter without changing what it's made of
  4. 8. the smallest unit of matter. found in the form of different elements.
  5. 9. when a solid gains enough energy to turn into a liquid