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# PS chemical reaction

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Manager
Joined: 04 Sep 2006
Posts: 113
PS chemical reaction [#permalink]

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24 May 2009, 09:00
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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 the 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 of A required to keep the reaction rate unchanged?
A. 100% increase
B. 50% decrease
C. 40% decrease
D. 40 % increase
E . 50% increase
Intern
Joined: 19 May 2009
Posts: 5
Re: PS chemical reaction [#permalink]

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24 May 2009, 10:54
Quick way of solving it:

Since concentration of B duplicated, concentration of A squared has to double too so the reaction change keeps the same . So A increased by /sqrt 2 factor , 41.4 % , making the closest number 40% (D)
Re: PS chemical reaction   [#permalink] 24 May 2009, 10:54
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# PS chemical reaction

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