Science 9 environmental chemistry

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Across
  1. 2. a chemical that is sprayed in order to kill unwanted organisms
  2. 4. include sugars and starches
  3. 7. turns litmus red
  4. 8. how acidic/basic something is
  5. 12. Nutrients needed in very small amounts
  6. 15. The breakdown of chemicals by light
  7. 16. a measure of how toxic a substance is. The lethal dose that will kill 50% of a population
  8. 17. Decreasing the concentration of a chem by adding more solvent
  9. 19. the breakdown of a chemical in the presence of water
  10. 21. store genetic material
  11. 22. air pollutants that trap heat in Earth's atmosphere
  12. 25. turns litmus blue
  13. 26. a class of chemicals that cause ozone depletion
  14. 27. made of smaller pieces called amino acids
Down
  1. 1. Using plants to remove pollutants from the soil
  2. 3. known as the silent killer. Comes from vehicle exhaust
  3. 5. a mixture of chemicals that creates a toxic sludge
  4. 6. Diffusion of water through a membrane
  5. 9. The spread of chemicals from high to low concentration
  6. 10. fats oils and waxes
  7. 11. contains NPK and helps plants grow
  8. 13. the breakdown of materials by living things
  9. 14. a form of nitrogen that is useable by living things
  10. 18. Nutrients needed in large amounts
  11. 20. Contain carbon and are often made by living things
  12. 23. Purified wastewater that will be returned to water ways
  13. 24. to take in directly like eating food