Which of the following is essentially biologically inactive?
A) (R)-ibuprofen
B) (S)-ibuprofen
C) (R)-naproxen
D) (S)-naproxen
A
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When the hydronium ion concentration equals 10 moles per liter, what is the pH of the solution? Is the solution acidic or basic?
A. pH = 0; this is an acidic solution. B. pH = 7; this is a neutral solution. C. pH = 1; this is an acidic solution. D. pH = -1; this is an acidic solution.
Over land, about what percent of the water vapor in the atmosphere comes from water that has transpired from the surface of plants?
a. 40-50% b. 60% c. 70% d. 80% e. 90%
In the developing world, East Asia and Latin America have some of the highest literacy at ________ percent
A) 90 B) 80 C) 70 D) 60 E) 50
What is a common approach used to deal with collapsible soil when constructing water canals?
a. Waterproof it with an impermeable barrier. b. Remove all of it and replace it with an engineered fill. c. Precollapse it by soaking it with water. d. Use a reinforced concrete lining for the canal. e. Extend sections of very large diameter pipe through these areas.