※ 引述《aaaaaakoyasu (六點半天色還沒亮)》之銘言： : 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 : 題目看沒有很懂...拜託了<(_ _)> 反應速率R與A^2成正比 與 B 成反比 所以R = A^2 / B 令新的反應速率 R` = A`^2 / B` 由題目得知 B` = 2B 若速率不變則 R` = R 由關係式得知 A`^2 = 2*A^2 則A`=(根號2)*A 變動率為 (根號2)-1 = 1.414 -1 = 40% # --

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