The isobutyl group is obtained by doing which of the following?
A) removing a hydrogen atom from C-1 of butane
B) removing a hydrogen atom from C-2 of butane
C) removing a hydrogen atom from C-1 of 2-methylpropane
D) removing a hydrogen atom from C-2 of 2-methylpropane
C
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Which one of the following concerning stalactites and stalagmites is not true?
a.) Stalagmites form on the floors of caves below the water table. b.) Stalactites are deposited from water dripping from the ceiling of an aerated cavern. c.) Both are composed of calcium carbonate. d.) Both are forms of dripstone; stalactites hang from the ceiling, stalagmites grow upward from the cavern floor.
Which of the following is covered by an ice sheet?
A. Iceland B. Glacier National Park C. The North Pole D. The Himalayas E. Antarctica
In a typical advancing winter storm, which of the following sequences of precipitation types is
most likely to occur? a. rain, freezing rain, snow, sleet b. rain, sleet, freezing rain, snow c. freezing rain, rain, sleet, snow d. rain, freezing rain, sleet, snow
We do not see stars in the daytime because
A) the Sun blocks their view. B) they simply don't exist in the daytime part of the sky. C) sunlight overwhelms starlight. D) of the lack of contrast with moonlight. E) the solar wind obscures their view.