Revision

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Across
  1. 2. chemical symbol O
  2. 4. what reacts together during a reaction
  3. 6. chemically symbol He
  4. 7. what is made during a reaction
  5. 10. Chemical symbol Na
  6. 11. absorbing heat energy
Down
  1. 1. releasing heat energy
  2. 3. chemical symbol K
  3. 5. Another word for burning
  4. 8. Another word breaking down
  5. 9. Two or more elements chemically combined