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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 percent, which of the following is closest to the percent change in the concentration of chemical A required to keep the reaction rate unchanged? A . 100% decrease B 50% decrease C 40% decrease D 40% increase E 50% increase
我的解答：rate 和concentration of chemical A的平方成正比，和concentration of chemical B成反比。如果B increased by 100 percent. 那么rate 应该是原来的1/2，那么concentration of chemical A应该是原来的(1/2)^(1/2)，最接近的应该是C。但是答案是D。
为什么？？？百思不得其解。 | 
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发表于 2008-9-27 21:40:00
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