Which of the following statements describes a polar molecule?
A. The molecules are usually not attracted to one another very strongly.
B. The molecules have a high degree of symmetry.
C. Polar molecules have the weakest intermolecular interactions with ionic compounds.
D. The electrons in the molecule are distributed evenly throughout the molecule.
E. None of these statements describe polar molecules.
Answer: E
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Which precipitation mechanism takes place when a warmer air mass rises after encountering a colder, denser air mass?
a. convectional precipitation b. frontal precipitation c. cyclonic (or convergence) precipitation d. orographic precipitation e. radiation precipitation
Two objects move toward each other because of gravity. As the objects get closer and closer, the force between them
A) increases. B) decreases. C) remains constant.
To encourage the development of sustainable agriculture, U.S. national agricultural policies will need to support all of the following, except
A) incorporating economic externalities such as soil degradation, pollution, and overuse of water supplies. B) more job creation in agriculture. C) continued support and subsidy of large monoculture farms. D) support of urban and organic agriculture.
Instructions: Choose one answer from each pair of selections. Dew is more likely to form on nights that are CLEAR AND CALM | CLOUDY AND WINDY