Chemistry Puzzle

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Across
  1. 2. – A chemical that reacts with a base to make salt and water; sour taste.
  2. 7. – A substance that speeds up a reaction without being used up.
  3. 8. – Negatively charged ions that gained electrons.
  4. 9. – Positively charged ions that lost electrons.
  5. 11. – A chemical that reacts with an acid to make salt and water; bitter taste.
  6. 12. – Two substances join to make one compound.
  7. 14. – A substance that can wear away materials.
  8. 16. – A reaction that slowly damages metal.
  9. 17. – When old bonds break and new bonds form.
  10. 18. – A short-lived unstable stage during a reaction.
  11. 19. – The minimum energy needed to start a reaction.
Down
  1. 1. – An enzyme in saliva that breaks starch into sugar.
  2. 3. – Energy stored in chemical bonds.
  3. 4. – A chemical that can harm people, property, or the environment.
  4. 5. – An enzyme in the liver that breaks down hydrogen peroxide.
  5. 6. – One compound breaks into simpler substances.
  6. 10. – A base that dissolves in water.
  7. 13. – A solution where water is the solvent.
  8. 14. – A reaction with oxygen that releases heat.
  9. 15. – A molecule made of two atoms.