Energy in reactions

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Across
  1. 8. reaction which releases heat energy
  2. 9. substance that is used in a chemical reaction
  3. 11. sign for this is two arrows pointing in opposite directions
  4. 12. variable that you change
Down
  1. 1. variable that you keep the same
  2. 2. substance that is made in a chemical reaction
  3. 3. reaction which takes in heat energy
  4. 4. energy that is required to start a reaction
  5. 5. you use this to weigh a substance
  6. 6. reaction between an acid and an alkali
  7. 7. you use this to measure the temperature
  8. 10. variable that you measure