For electric power that costs 10 cents per kilowatt hour, the cost of operating a 110-V heater that uses 20 A for 10 hours is
A. $2.20.
B. $5.50.
C. $0.22.
D. $0.55.
Answer: A
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Why might increasing the concentration of a set of reactants increase the rate of reaction?
A. You have increased the ratio of reactants to products. B. You have increased the chances that any two reactant molecules will collide and react. C. The concentration of reactants is unrelated to the rate of reaction. D. The rate of reaction depends only on the mass of the atoms and therefore increases as you increase the mass of the reactants. E. none of the above
Which country in Latin America sends the largest number of legal immigrants to the United States?
A) Chile B) Brazil C) Colombia D) El Salvador E) Mexico
Use your knowledge of plate boundaries to answer whether an earthquake is likely or unlikely to occur at the location of the red circle.
A) Likely
B) Unlikely
Consider the following processes: respiration, combustion, polymerization, nitrification, industrial fixation, and photosynthesis. How many of these result in the release of oxygen into the atmosphere?
A) all B) 4 C) 2 D) 1 E) none