Which of the following molecules does NOT occur in left- and right-handed forms (carbon is the central atom and the groups around this central atom are in parentheses)?
A) (H) (Cl) C (F) (D)
B) (CH3 ) (NH2 ) C (COOH) (H)
C) (CHO ) (C2H5 ) C (C2H5 ) (H)
D) (C4H9 ) (C2H5 ) C (CH3 ) (C3H7)
C
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Indicate whether the statement is true or false
Which was NOT a Voyager discovery about the rings of Saturn?
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A wave moves in a rope with a certain wavelength. A second wave is made to move in the same rope with twice the wavelength of the first wave. The frequency of the second wave is _________ times the frequency of the first wave
Fill in the blank(s) with correct word
Boat 1 goes directly across a stream a distance L and back taking a time t1 . Boat 2 goes down stream a distance L and back taking a time t2 . If both boats had the same speed relative to the water, which of the following statements is true?
a. t2 > t1 b. t2 < t1 c. t2 = t1 d. t2 = 2t1 e. t2 = 0.5t1