Across
- 3. a scale that measures the acidity or alkalinity of a substance (2 words)
- 8. an area or conditions in which an organism lives.
- 9. an organic nutrients containing carbon, hydrogen, and oxygen
- 10. a chemical that produces an acidic substance having a pH level of less than seven
- 12. a device that encourages complete oxidization during combustion (2 words)
- 16. the process of adding calcium carbonate to the environment
- 17. a chemical reaction in which oxygen combines with other elements to form a new substance
- 19. a special protein molecule that regulates chemical reactions in living organisms
Down
- 1. a chemical used to control mold, or fungi
- 2. a processed whereby chemicals accumulate in the tissues of organisms in the food chain
- 3. paper saturated with a chemical to show if a substance is acidic or basic (2 words)
- 4. a chemical used to control weeds
- 5. a mineral that the body requires in an amount of 100mg a day to stay healthy
- 6. rain or snow containing acid compounds from the air (2 words)
- 7. a mixture of plant compounds used as a chemical indicator
- 9. a substance that speeds up a chemical reaction without being used up in the reaction
- 11. a chemical used to control pests
- 13. a chemical used to control insects
- 14. the study of the properties of matter
- 15. the combining of an acid and a base to produce salt and water
- 18. a chemical that produces a basic substance having a pH level of more than seven