[問題]PP的問題

由 **angelat** » 2006-08-22 20:16

13. The rate of a certain chemical reation 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%, which of the collowing is closest to the percent change in the concentration of chemical A required to keep the reaction rate unchanged?

a. 100% decreased
b. 50% decreased
c. 40% decreased
d. 40% increased
e. 50% increased

這一題我看懂了，可是不會算，請高人指點，謝謝。

由 **FrankChang** » 2006-08-23 00:33

請問答案是d.嗎!?

由 **angelat** » 2006-08-23 12:48

是，請問要怎麼算呢

由 **FrankChang** » 2006-08-23 13:19

反應速率與A^2成正比,與B成反比,
假設原先速率:A^2/B,後來速率(xA)^2/2B,
速率要維持不變x=2^0.5=1.414大約是增加40%

由 **angelat** » 2006-08-23 16:13

我會算了
謝謝

[問題]PP的問題

[問題]PP的問題

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