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Day 31 Qualitative and Quantitative Properties of Matter

Explore the bioaccumulation and biomagnification of fat-soluble chemicals like DDT, an enduring synthetic pesticide. Discover its lasting effects on ecosystems and the food chain. Learn about qualitative and quantitative properties in a classroom setting.

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Day 31 Qualitative and Quantitative Properties of Matter

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  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

  6. DDT

  7. DDT (dichloro-diphenyl-trichloroethane)

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

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

  10. 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

  11. Video

  12. What do you think would happen over time?

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

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

  15. 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?

  16. DDT is is stored in the fat of animals

  17. Reading Handout

  18. 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

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