Which of the following pairs of reagents can be used to synthesize PET poly(ethylene terephthalate)?
A) ethylene glycol and dimethyl terephthalate
B) ethylene glycol and terephthalic acid
C) either a or b
D) neither a nor b
C
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More freshwater fish are threatened with extinction than any other type of species.
Answer the following statement true (T) or false (F)
A restriction on behavior imposed by social custom is a
A) folk culture. B) habit. C) popular culture. D) taboo. E) tariff.
As student doing a titration of HNO3 with sodium hydroxide wanted to use methyl orange as an indicator. Methyl orange changes color at pH = 3.7. Which of the following will be true of this experiment?
A) The concentration of HNO3 will be reported as too high. B) The concentration of HNO3 will be reported as too low. C) The concentration of HNO3 will be reported correctly. D) The experiment cannot be done at all.
________ is the large impact crater in southern Ontario that is about 100 km in diameter and dates to about 214 million years.
A. Manicouagan B. Barringer C. Crooked Creek D. Upheval Dome