Which of the following is true of London dispersion forces?
A) They decrease as the number of electrons in a molecule increases.
B) They are only present in some molecules.
C) Both a and b are correct.
D) Neither a nor b is correct.
D
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Under what circumstances might someone breathe stratospheric air? How often is this likely to happen in a person's lifetime?
What will be an ideal response?
Which of the following is the most reasonable conclusion based on the data in the figure?
A) Forest fires and fossil fuel combustion are increasing atmospheric carbon dioxide concentrations. B) There is a great deal of uncertainty in measurements of global atmospheric carbon dioxide levels. C) Carbon dioxide molecules multiply themselves over time. D) Average annual atmospheric carbon dioxide concentrations have been increasing since 1960.
A broad ramp of sediment formed at the base of mountains when alluvial fans merge is
A. an arroyo B. a pediment C. a bajada D. a playa
Positive phases of El Niño will bring
A. heavy rainfall from Chile to California. B. drought to all parts of the planet then heavy rain. C. heavy rain to Southeast Asia and Australia. D. drought conditions to Southeast Asia and Australia.