Question

Question 33

If the K_ow for the compound was 10^6, how many mg would have been found in the water? Why are so there incredibly many different pesticides that have been tried and placed on the market? Into what type of tissue material do biaccumulating compounds partition (mostly)? Proteinaceous or lipid, and WHY? Not counting the common presence of chlorine, two chemical characteristics are typical of so-called "legacy" (aka old school) pesticides like DDE, dieldrin, etc. have led to a lot of problems. What are these two? What two molecular characteristics of octanol make it a useful surrogate for lipid material into which bioconcentration can occur? Draw the bad guy dioxin, namely 2, 3, 7, 8-tetrachlorodibenzodioxin. Include any hydrogens. Organohalogen compounds like the freons are rather stable in the environment, i e., they are persistent. However, they do not accumulate in biological tissue or soils or sediments Why not? (An example of a Freon is CCl_2F_2 which is Freon 12.) In a given environmental setting (e.g., Portland), compounds like PCBs and the flame retardant PBDEs are mostly found in the soil and sediments and in the lipid tissues of local organisms. How is it possible then that these compounds can reach places where they were never used? Like within the Arctic Circle ... in other words, what are the mechanisms involved in the movement?

Answer 1

Reaction mechanism rate determineing step: slowest step in a reaction mechanism rate = K[A][B] rate = k[A]^2[B] effect of tempetaure an reaction rates and rate constant the concept of activation energy himogenious and heterogeneous catalysts including enzymes homogenious catalystic same phase as reaction mixture peroxidisulfate reaction S_20_8 + 2I rightarrow 2SO_4 + I_2 2 Fe(CO_4 - 2I rightarrow 2SO_4 +I_2 2Fe + 2 I rightarrow 2 Fe (aq)+2SO_4