Chemical reactions

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Across
  1. 2. speeds up a chemical reaction
  2. 4. dioxide a gas which turns limewater cloudy
  3. 7. means to break down
  4. 9. has the chemical symbol Mg
  5. 10. makes bonds
Down
  1. 1. breaks bonds
  2. 3. means heat
  3. 5. means to add oxygen
  4. 6. An example of a chemical reaction observation
  5. 8. means to burn a fuel in plenty of oxygen