crossword puzzle assignment

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Across
  1. 3. Two atoms
  2. 7. Change during reaction
  3. 8. A half-reaction in which a chemical species decreases its oxidation number
  4. 9. Formed as a result of a chemical reaction
  5. 12. symbolic representation of a chemical reaction
  6. 13. element reacts with a compound and takes the place of another element
  7. 15. To produce and provide
  8. 18. Fuel and oxidizing agent produce energy
  9. 19. having oxygen atoms
Down
  1. 1. Increases the rate of a chemical reaction
  2. 2. two compounds react and both of the switch places
  3. 4. A compound that contains two different elements
  4. 5. chemical decomposition produced by passing an electric current through a liquid or solution
  5. 6. cause forming from a solid solution
  6. 10. separation of a chemical compound into elements
  7. 11. numbers in front of the formula
  8. 14. A charged chemical species
  9. 16. Water
  10. 17. Two or more compounds combines to form a more complex product