Of the following ions, which always forms soluble compounds?
A) Na+
B) NH4+
C) C2H3O2-
D) all of these
D
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After it starts being used in a nuclear reactor, how long can nuclear fuel be used before it is depleted and becomes high-level nuclear waste that must be stored safely for 10,000 years?
A. 3-4 years B. 30-40 years C. 300-400 years D. 3-4 days
A ball is thrown upward and caught when it comes back down. Neglecting air resistance, the speed with which it is caught is
A) more than the speed it had when thrown upward. B) less than the speed it had when thrown upward. C) the same as the speed it had when thrown upward.
What creates caverns in limestone rock?
a. ?Underground streams erode the walls of the channels they flow through. b. ?Limestone is deposited as a sediment, and caverns exist where organic material was trapped and decomposed. c. ?Earthquakes create gaps at weak boundaries in the limestone. d. ?Limestone dissolves in the presence of salt, and creates caverns when located under the sea. e. ?Acidic rainwater dissolves limestone rock, leaving empty caverns.
Which of the following linkages is found in sphingolipids?
A) sphingosine-choline-phosphate B) sphingosine-phosphate-choline C) phosphate-sphingosine-choline D) none of the above