The predominant gas in the atmosphere of Mars is
A. oxygen.
B. nitrogen.
C. water vapor.
D. carbon dioxide.
E. methane.
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+ = 1030 M. It is impossible because any container used to hold the acid would immediately corrode. B. Concentration of H3O+ = 30 M. It is impossible because pH cannot be negative. C. Concentration of H3O+ = 3 M. It is impossible because it is hard to measure such a small amount of hydronium ions accurately. 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 organizations is NOT linked to globalization?
A) the Red Cross B) the UN C) the World Trade Organization D) the IMF E) the World Bank
Of the following steps in classical cyclogenesis of a mid-latitude cyclone, this happens last
A) occlusion occurs B) a warm front forms C) a cold front forms D) a region of low pressure is established
Judge the following sentence according to the criteria given below. It is essential to know the rate of current sea-level rise because approximately 100 million people live around the world at locations less than 1 meter above sea level
A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct but the reason is incorrect. D) The assertion is incorrect but the reason is correct. E) Both the assertion and the reason are incorrect.