Combustion and Chemical reactions

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Across
  1. 3. – A force holding atoms together.
  2. 5. – The start of burning.
  3. 7. – Making a complex substance from simpler ones.
  4. 8. – Two or more elements chemically joined.
  5. 10. – A substance formed by a reaction.
  6. 12. – When reaction rates are equal.
  7. 14. – A reaction where a substance burns with oxygen.
  8. 18. – A gas needed for combustion.
  9. 19. – Gain of electrons or loss of oxygen.
Down
  1. 1. – The ability to cause change.
  2. 2. – A starting substance in a reaction.
  3. 4. – Releasing heat energy.
  4. 6. – Absorbing heat energy.
  5. 8. – A substance that speeds up a reaction.
  6. 9. – Two or more atoms bonded.
  7. 11. – A process that changes substances.
  8. 13. – A substance that reacts to release stored energy as heat or energy.
  9. 15. – Loss of electrons or gain of oxygen.
  10. 16. – Breaking a compound into simpler substances.
  11. 17. – A pure substance of one atom type.