The rate of a certain chemical reaction is directly proportional to the square of the concentration of chemical A present and inversely proportional to the concentration of chemical B present . If the concentration of chemical B is increased by 100 present, which of the following is closest to the percent change in the concentration of chemical A required to keep the reaction rate unchanged?
40% increase作者: Phlypig 时间: 2010-5-31 15:27
这么长，我看着都头晕呀
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