Exo and endo crossword

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Across
  1. 2. either negative or positive will determine the reaction
  2. 4. chemical... hold molecules together
  3. 9. the energy a reaction needs to get started
  4. 10. delta H endothermic reaction
  5. 12. gives off energy
  6. 13. an endothermic reaction involving plants
  7. 15. delta H exothermic reaction
  8. 16. takes in energy
Down
  1. 1. warmth
  2. 3. absorbs energy CaCO3+ Heat= CaO+ CO2
  3. 5. Hydrogen is a ...
  4. 6. water changing matter
  5. 7. things they start with
  6. 8. things they end with
  7. 11. releases energy CH4+ O2= CO2+ H2O
  8. 14. molecules needed to break and repair bonds