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emeraldmule11Lv1

11 Dec 2019

Which of the following is true about highly persistent toxic chemicals?

a. lose their toxicity as they cycle through the food chain and the environment.

b. retain their toxicity as they cycle through the food chain and the environment.

c. lose their toxicity as they cycle through the food chain but retain their toxicity in the environment.

d. retain their toxicity as they cycle through the food chain but lose their toxicity in the environment.

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Greg MontoyaLv10

3 Nov 2020

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(a) Free Zinc is toxic to fish at levels of 10^7 M, and the wellwater for your home contains Zn^11 at a concentration of 65 ug/L(1*10^6 M) In an attempt to lower the free zinc concentration inthe water he is using for the bowl of his beloved "Goldy Goldfish,"your younger brother adds cyanide to complex the zinc. Goldytragically dies from cyanide poisoning, but still find the waterchemistry aspects of the problem fascinating. Determine thespeciation of Zn^11 and cyanidein a solution at pH 8.1 whichcontains 1*10^6 M of Zn(NO3)2 and 1*10^4 M total cyanide (HCN+CN).The toxicity of cyanide to fish is complicated, but the U.S. EPA'squality criteria for water indicates that free cyanideconcentrations > 50 ug/L are lethal to fish. If you assume thisthe case, does this explain why Goldy died?

(b) Resolve for the case where your brother, in an effort toavoid cyanide toxicity to his new fish, Goldy 2, adds total cyanideat the same concentration as Zn^11, that is, 1*10^6 M. Is thisapproach likely to have solved the problem?

compare and discuss (using target plots) which of the following is more environmentally friendly antifreeze coolant,nail polish remover,paint remover.(2 formations of each product type) consider the mixture,formulations that are shown in table 1 .CAS is the chemical abstract number(register number) Write a report that includes

1) introduction /objectives

2) procedure (briefly explain your procedure,stating and justifying assumptions made)

3) results and discussions (show all target plots comparing products and constituents of each product and discuss the results in terms of toxicity,mobility and persistence.

note: to draw each scale for each product,you could make the assumption that it is appropriate to use the worst scale among all chemicals of the product.For example,a product has two chemicals A and B.A has higher algae aquatic toxicity and B has higher fish aquatic toxicity.Use A's value to draw algae toxicity and B's value to draw fish toxicity.you could make other assumptions also.In your procedures,briefly state your assumptions and explain the strengths or weaknesses of that choice.

Table 1 composition of consumer products

Product composition CASRN

paint remover (1) methyl chloride 75092

propylene glycol methyl ether 107982

ammonia 7664417

Di propylene glycol methyl ether 34590948

Toluene 108883

Methyl alcohol 67561

Paint remover (2) methyl chloride 75092

methyl alcohol 67561

toluene 108883

ethylene glycol butyl ether 111766

Nail polish remover (1) ethyl acetate 141786

Isopropyl alcohol 67630

panthenol 16485102

Estasol DBE

Tocophery acetate

Nail polish remover (2) acetone 67641

propylene carbonate 108327

Di methyl glutarate 1119400

Di-methyl succinate 106650

Antifreeze coolant (1) Ethylene glycol 107211

Di ethylene glycol 111466

Antifreeze coolant (2) propylene glycol 57556

Hello, can someone please help this poor mentally unstable college student. Much appreciated.

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