Chemical Reactions

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Across
  1. 3. What is the common name of the brown oxide that forms on iron?
  2. 5. Energy released into the atmosphere. _______ reaction.
  3. 7. Atomic elements are placed in order of atomic N____.
  4. 9. What gas is required for combustion?
  5. 10. Which releases more energy, complete or incomplete combustion?
  6. 13. Energy absorbed from the atmosphere. ________ reaction.
  7. 15. Can atoms be made or destroyed in a chemical reaction?
  8. 16. Subatomic particle with a neutral charge
  9. 17. What black solid is a product of incomplete combustion?
Down
  1. 1. Heat energy out. Bonds F______.
  2. 2. What do we produce when we burn hydrogen?
  3. 4. A biological catalyst.
  4. 6. Subatomic particle with a negative charge
  5. 8. The force that joins oppositely charged ions.
  6. 11. Subatomic particle with a positive charge
  7. 12. Heat energy in. Bonds B______.
  8. 14. Speeds up the rate of a reaction.