Chemistry fun!

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Across
  1. 1. a substance that increases the rate of a reaction and is regenerated at the end of the reaction
  2. 2. [ H2 + 02 = H2O ] is an example of a _____ equation
  3. 3. a positively charged ion
  4. 5. Al2S3
  5. 7. an ion that is composed of more than one atom
  6. 8. German chemist who patented the process of extracting ammonia in 1910
  7. 10. a chemical reaction in which one element takes the place of another element in a compound is a ______ displacement reaction.
  8. 11. a pure substance that undergoes a chemical change
  9. 12. AB = A + B (type of reaction)
  10. 13. in the activity series the _____ reactive metals appear at the bottom
Down
  1. 1. a number that is placed in front of a chemical formula in a balanced chemical equation
  2. 4. Change in colour and formation of a precipitate are examples of evidence that a _____ ______ has occurred.
  3. 5. a negatively charged ion
  4. 6. A + B =AB (type of reaction)
  5. 9. CO32-