Topics 1-3 Crossword

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Across
  1. 2. invertebrate of the phylum Arthropods
  2. 5. speeds up a chemical reaction
  3. 8. providing nourishment
  4. 11. discharging
  5. 13. chemical used to control molds and fungi
  6. 15. pH value of less than 7
  7. 16. mixture of plant compounds used as a chemical indicator
  8. 17. protein molecule in living organisms
Down
  1. 1. oxygen combines with other elements to from new substances
  2. 3. chemical used to control weeds
  3. 4. chemical used to control pests
  4. 6. something annoying or troublesome
  5. 7. unnatural or simulated
  6. 9. pH value of more than 7
  7. 10. chemical used to control insects
  8. 12. fertilizer consisting of potassium nitrate or sodium nitrate
  9. 13. any substance used to fertilize the soil
  10. 14. natural process or in return for cultivation