Chemistry

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Across
  1. 2. different substance after change, cannot get back
  2. 3. number of protons, smaller number
  3. 4. heat enters, temperature decreases
  4. 7. negative charge, outside nucleus
  5. 8. protons + neutrons, larger number
Down
  1. 1. same substance after change, can get back
  2. 4. heat exits, temperature increases
  3. 5. no charge, in nucleus
  4. 6. positive charge, in nucleus