Day 31 Qualitative and Quantitative Properties of Matter

1. Day 31 Qualitative and Quantitative Properties of Matter

2. Solubility and the Environment

3. Solubility in fat is an important property for some chemicals

4. Solubility in fat is an important property for some chemicals • Bioaccumulation involves the build-up of toxic substances in the tissues of animals over time

5. Solubility in fat is an important property for some chemicals • Bioaccumulation involves the build-up of toxic substances in the tissues of animals over time • This leads to biomagnification which involves the accumulation of toxic substances in progressively higher concentrations toward the top of the food chain

7. DDT

8. DDT (dichloro-diphenyl-trichloroethane)

9. DDT (dichloro-diphenyl-trichloroethane) • DDT is an example of a fat-soluble substance that bioaccumulates and biomagnifies in mammals

10. DDT is a synthetic pesticide that was used extensively in the 1940s and 1950s

11. DDT is a synthetic pesticide that was used extensively in the 1940s and 1950s to eliminate insect-carrying diseases and increase crop yields throughout the world

12. Video

13. What do you think would happen over time?

14. What do you think would happen over time? • Scientists learned that DDT doesn’t break down easily

15. By the 1970s, over a billion kilograms of DDT had entered into the fats of animals

16. By the 1970s, over a billion kilograms of DDT had entered animals • How many duplicates of you would it take to weight over a billion kilograms?

17. DDT is is stored in the fat of animals

18. Reading Handout

19. In class work: • Note down the following of each type of qualitative and quantitative property from pages 151-156 (i.e., viscosity)i) what it is ii) describe a material example of the property