Formaldehyde has the chemical formula CH2O. How many electrons must be shown in the Lewis structure of formaldehyde?
A) 4
B) 8
C) 12
D) 16
C
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An electron de-excites from the fourth quantum level to the third and then directly to the first. Two frequencies of light are emitted. How do their combined energies compare to the energy of the single frequency that would be emitted by de-excitation from the fourth level directly to the first level? The combined energies of the two frequencies emitted by the one electrons is
A. not predictable because other factors, such as the temperature of the surroundings must also be considered. B. equal to the energy of the single frequency. C. greater than the energy of the single frequency. D. less than the energy of the single frequency.
Which stage in thunderstorm formation is characterized by updrafts accompanied by downdrafts induced by falling precipitation?
A) Cloud merger stage B) Cumulus stage C) Dissipating stage D) Mature stage
What is one advantage of dam and reservoir systems?
A. Dams and reservoirs disrupt migration of some fish. B. Dams and reservoirs can displace people behind the dam C. Dams and reservoirs lead to devastating flooding if there is a failure. D. Dams and reservoirs decrease downstream flooding. E. Dams and reservoirs reduce nutrients released downstream.
Approximately what percentage of patients who are not treated for strep throat might be expected to develop heart valve damage?
A) 1.2% B) 3% C) 40% D) 43%