Methane:
A) is a permanent gas.
B) is a good reflector of thermal radiation.
C) is removed from the atmosphere by the digestive processes of cattle.
D) has increased in concentration over the last 50 or so years.
Answer: D
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What would be the concentration of hydronium ions in a solution that had a pH = -3? Why would such a solution be impossible to prepare?
A) Concentration of H3O+ = 3 M. It is impossible because it is hard to measure such a small amount of hydronium ions accurately. B) Concentration of H3O+ = 30 M. It is impossible because pH cannot be negative. C) Concentration of H3O+ = 1030 M. It is impossible because any container used to hold the acid would immediately corrode. D) Concentration of H3O+ = 103 M. It is impossible because only so much acid can dissolve in water before the solution becomes saturated.
Which of the following is not an example of an intermolecular attraction?
A) covalent bonding B) dipole-dipole interactions C) London dispersion forces D) hydrogen bonding
This image shows the annual per capita consumption of various economically important materials. Based on this figure, which of the following categories does the average American consume the most from every year?
A) Nonmetallic resources B) Metallic resources C) Energy resources
At the surface, occluded fronts are always followed by colder air
a. True b. False