Science Unit 3 Topics 1-3 Crossword

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Across
  1. 2. the process whereby chemicals accumulate in the tissues of organism along the food chain
  2. 4. a spray that controls “fungus pests”
  3. 7. a spray that controls “pests”
  4. 8. an example of nutrients that the human body cannot make itself and must get from food
  5. 10. a mineral that the body requires in the amount of less than 100mg/day in order to maintain health
  6. 13. rain or snow containing acid compounds from the air
  7. 14. a spray that controls “insects
  8. 17. paper saturated with a chemical to show whether a substance is acidic or basic
  9. 18. a chemical that produces a basic substance, having a pH value of more than 7
Down
  1. 1. special protein molecules that regulate chemical reactions in living organisms
  2. 2. a living organism whose state is indicative of conditions in a particular environment
  3. 3. a chemical that produces an acidic substance, having a pH value of less than 7
  4. 5. a chemical reaction in which oxygen combines with other elements to form new substances
  5. 6. a chemical that produces a basic substance, having a pH value of more than 7
  6. 9. a spray that controls “weeds”
  7. 11. a mineral that the body requires in the amount of 100mg/day or more in order to maintain health
  8. 12. a chemical that changes colour to indicate whether a substance is an acid or a base
  9. 15. a substance that speeds up a chemical reaction without being used up in a reaction
  10. 16. a way of comparing the relative acidity or alkalinity of a substance