chemistey crossword

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Across
  1. 5. reaction – When substances change into new substances.
  2. 7. – A positively charged ion (loses electrons).
  3. 8. – Using electricity to break a compound apart.
  4. 10. – A reaction that absorbs energy.
  5. 14. – A base that dissolves in water.
  6. 16. – A reaction where something burns in oxygen.
  7. 17. – When yeast breaks down sugar to make alcohol.
  8. 18. – A sour chemical that reacts with bases to make salt and water.
Down
  1. 1. – A reaction where one compound breaks into simpler substances.
  2. 2. – A reaction between an acid and a base.
  3. 3. – A substance that speeds up a reaction without being used up.
  4. 4. – A reaction that releases energy, usually heat.
  5. 5. – When a metal slowly wears away due to a chemical reaction.
  6. 6. – An enzyme in saliva that breaks starch into sugar.
  7. 9. energy – The minimum energy needed to start a reaction.
  8. 11. – A substance that changes colour in acids or bases.
  9. 12. – A solution where water is the solvent.
  10. 13. – A molecule made of two atoms.
  11. 15. – A bitter chemical that reacts with acids to make salt and water.
  12. 18. – A negatively charged ion (gains electrons).