Which of the following is not the molecular formula of an alkane?
A) C15H32
B) C19H40
C) C20H42
D) None of them, these are all alkanes.
D
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The orbital speeds of the planets in the solar system depend on
A. their distances from the Sun. B. the masses of the planets. C. both of these D. none of the above
____________ is an expression of the internal form of a substance. Fill in the blank(s) with the appropriate word(s)
This figure helps to explain that for the last half century most increase in food production has come from
A) expanding agricultural land. B) expanding exports. C) discovering new foods. D) increasing agricultural productivity. E) increasing fish harvests.
Where a stream flows into a standing body of water, such as a lake or the ocean, stream sediment is deposited to form a(n) _______________
Fill in the blank(s) with correct word