Given the compounds 2,3-dimethylpentane and 2,4-dimethylpentane, which of the following is true?
A) Only 2,3-dimethylpentane is chiral.
B) Only 2,4-dimethylpentane is chiral.
C) Both are chiral.
D) Neither is chiral.
A
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Using the analemma and the equation SA = 90° - AD calculate the solar altitude of the noon Sun at the following latitudes on the dates given:
Additional question:
1. In your own words, explain what you have calculated in problem 2c (explain what the answer means, not how it was calculated). Be as specific as possible.
Elements bond together to form molecules because they ____
A)are most stable when their outer electron shell is filled B)need to have a positive charge C)need to have a negative charge D)are glued together by protons E)are pulled by electromagnetic forces
Recycling programs, especially for aluminum cans, have become very successful because it requires only ________ of the energy needed to make a can from bauxite ore
A) 10% B) 5% C) 55% D) 40% E) 20%
Which rock type is associated with a high-energy environment (such as a very turbulent stream)?
A) conglomerate B) chert C) shale D) none of these