Across
- 3. uses a sorbent to reduce oxide emmissions
- 4. pennies were made out of this
- 8. a fragrant natural oil used as an insect repellent and in perfume and soap manufacture
- 9. has a PH value less than 7
- 10. a mixture of plant compounds used as a chemical indicator
- 11. major part of thyroid hormones, which regulate metabolism
- 12. a chemical used to control molds or fungi
- 14. short for dichlorodiphenyltrichloroethane
- 16. crucial part of red blood cells that regulates oxygen
- 17. found in salt
- 18. has a PH value of more than 7
Down
- 1. storage of unused chemical energy
- 2. an invertebrate animal of the large phylum Arthropoda, such as an insect or crustacean.
- 5. found in bananas
- 6. a substance that is toxic to plants, used to destroy unwanted vegetation
- 7. forms bones and teeth
- 13. helps regulate water balance
- 15. obtained by heating limestone and which combines with water with the production of heat.