Chemistry

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Across
  1. 4. greenhouse gas
  2. 5. benzene
  3. 7. going same speed in both directions
  4. 9. rust
  5. 10. CH4
  6. 12. methane
  7. 15. C6H6
  8. 16. alternating single and double bonds with high stability
  9. 18. contains carbon and hydrogen
  10. 19. two atoms getting together
  11. 20. how atoms combine
Down
  1. 1. negative charge in atom
  2. 2. how fast an atom holds its electrons
  3. 3. used in batteries
  4. 6. Fe2O3
  5. 8. really large number of atoms or molecules
  6. 11. study of rates of reactions
  7. 13. first element
  8. 14. makes balloons stay up
  9. 17. makes reaction faster without getting used up