Heap-leach extraction involves piling crushed ore into large piles and spraying it with ________________.
A) an alkaline-cyanide solution
B) concentrated salt water
C) high-pressure steam
D) giant sandblasters
E) none of these are correct.
Answer: A) an alkaline-cyanide solution
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If you saw the label "phenylephrine HCl" on a decongestant, would you worry that consuming it would expose you to the strong acid hydrochloric acid, HCl?
A. Yes, because of the hydrochloric acid it contains. B. No, because it is balanced by the phenylephrine. C. No, because the drug is in the solid phase. D. No, because this is a salt made using hydrogen chloride, but it is in no way hydrogen chloride.
How much greater is the shear stress of the Athabasca Glacier than the Mississippi River?
A) 2 times B) 4 times C) 10 times D) 100 times
The disappearance of the Aral Sea is attributed to
A) the diversion of water for irrigation. B) natural variations in rainfall and temperature. C) human-induced variations in rainfall and temperature from global climate change. D) increased runoff from the sea. E) point-source pollution from nuclear power plants.
From which amino acid is tyrosine normally derived?
A) cysteine B) phenylalanine C) tryptophan D) valine