Crossword science.

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Across
  1. 2. a group of atoms combining to together
  2. 4. a chemical substance composed of many
  3. 5. make up matter; the faster the particles move,
  4. 6. during a chemical reaction
  5. 7. reaction
  6. 8. reaction One or more substances change to
  7. 12. A substance that takes part in and undergoes
  8. 14. particles
  9. 15. a pure substance that cannot be broken down
  10. 16. a different substance
Down
  1. 1. A substance produced during a
  2. 3. Absorbing heat
  3. 9. Releasing heat
  4. 10. molecules
  5. 11. warmer the matter becomes
  6. 13. the smallest particle
  7. 14. Energy The total kinetic (motion) energy of the