Endo/Exo

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Across
  1. 3. Needed to break bonds
  2. 6. absorbes heat
  3. 10. When two or more elements mix together
Down
  1. 1. A source of energy
  2. 2. a substance that takes part in and undergoes change during a reaction
  3. 4. Joined by a chemical reaction
  4. 5. A process in which a chemical substance changes because of the addition of oxygen
  5. 7. releases heat
  6. 8. Substance reacts with oxygen and gives off heat
  7. 9. To separate