Environmental Chemistry: Topics 1-3

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Across
  1. 2. Element that forms bone and teeth (1)
  2. 5. A type of pesticide banned in 1969 in Canada (2)
  3. 9. A childhood disease caused because of a low-protein diet (1)
  4. 11. A chemical used to control insects (2)
  5. 12. A form of farming that uses chemicals to grow and take care of crops (2)
  6. 13. A mineral that a person needs 100mg/day or more of (1)
  7. 15. A way of comparing relative acidity or alkalinity of a substance (3)
  8. 16. An element that is a component of an antioxidant enzyme that helps prevent decay of cell function (1)
  9. 18. A indicator that is a mixture of plant compounds extracted from certain lichens (3)
  10. 20. Farming that does not use pesticides (2)
  11. 23. A human's only source of _______ is from plants (1)
  12. 24. A chemical that has a pH of more than 7 (3)
Down
  1. 1. What does pH stand for? (3)
  2. 3. A substance that speeds up a chemical reaction without taking part in the reaction (3)
  3. 4. A disease, concerning mosquitoes, that ddt was used to get rid of (2)
  4. 6. The process where chemicals collect in the tissues of organisms along the food chain (2)
  5. 7. The chemist that invented ddt (2)
  6. 8. Adds extra nitrogen to the environment (1)
  7. 10. A chemical used to control weeds (2)
  8. 14. The process of adding calcium carbonate to the environment (3)
  9. 17. An element that is a component of some enzymes, involved in bone formation and protein metabolism (1)
  10. 19. Devices that use sorbents which absorb oxides (3)
  11. 21. A chemical that produces an acidic substance and has a pH of less than 7 (3)
  12. 22. An element that is an important part of red blood cells that regulates oxygen transport (1)