Energy changes

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Across
  1. 2. when exothermic reaction occurs
  2. 4. Carbon+Oxygen
  3. 6. sweets is endothermic reaction
  4. 8. processes give in heat
  5. 9. CalciumOxide+Water
  6. 11. is an exothermic
  7. 13. calcium oxide+water
  8. 14. reacts with water or acids, heat energy is given out
  9. 15. given out when metal reacts with water or acid
  10. 17. potassium+chlorine
  11. 20. substance that forms when ice melts
  12. 21. Reaction where substance reacts with oxygen
Down
  1. 1. when endothermic reaction takes place
  2. 3. substance that forms when water evaporates
  3. 5. Element that takes up 20% of the air
  4. 7. processes give out heat
  5. 10. substance that combines with and oxygen
  6. 12. is another term for burning
  7. 13. formula of carbon dioxide
  8. 16. process temperature decreases
  9. 18. is a reaction in which substance combines with oxygen
  10. 19. Magnesium+Oxygen