Polychlorinated biphenyls (PCBs) have been banned because they are an environmental hazard. Which of the following was NOT a reason for banning them?
A) PCBs degrade slowly in nature.
B) PCBs are nonpolar compounds and do not dissolve readily in water.
C) PCBs have high electrical resistance and are excellent insulating materials.
D) They lower the glass transition temperature, Tg, when they are added to a polymer.
Question 2
Soaps are
A) anionic surfactants.
B) nonionic surfactants.
C) neutral surfactants.
D) positive surfactants.
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