science

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Across
  1. 3. reactions between a acid and base making a ...
  2. 5. a chemical reaction that absorbs energy
  3. 7. extremely combustable substances
  4. 9. reaction that requires oxygen to occur
  5. 12. a reaction which releases energy
  6. 13. base that is dissolved in water
  7. 16. there are to types of this aerobic and anarobic
  8. 19. the brown substance on iron
Down
  1. 1. acid releases these
  2. 2. the breakdown of metals
  3. 4. plants require this reaction to live
  4. 6. formed by a base
  5. 8. way of protecting aluminium
  6. 10. a substance that is bitter and slimy feel
  7. 11. scale to measure the concentration of h atoms
  8. 14. a substance with sour taste and corrosive
  9. 15. a catalyst to speed up a reaction
  10. 16. chemicals made from products
  11. 17. chemicals after a reaction made by reactants
  12. 18. rain with acid in it