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# The rate of a certain chemical reaction is directly proportional

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The rate of a certain chemical reaction is directly proportional  [#permalink]

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09 Sep 2017, 10:37
00:00

Difficulty:

55% (hard)

Question Stats:

43% (01:02) correct 57% (01:12) wrong based on 7 sessions

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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%, 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. 100% increase

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Abhishek Parikh
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Re: The rate of a certain chemical reaction is directly proportional  [#permalink]

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09 Sep 2017, 10:41
Since B is increased, A also has to be increased.
Thus option A, B and C are eliminated.
Out of option D and option E,
Option E is 100% increase, but since question says square of concentration of chemical A is related to rate of reaction and concentration of chemical B is already increased by 100% so concentration of A if increased by same (100) percent will lead to increase in rate of reaction.
Thus eliminating option E also
Thus option D
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Abhishek Parikh
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Re: The rate of a certain chemical reaction is directly proportional  [#permalink]

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09 Sep 2017, 10:42
HolaMaven wrote:
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%, 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. 100% increase

Discussed here: the-rate-of-a-certain-chemical-reaction-is-directly-90119.html

--== Message from the GMAT Club Team ==--

THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

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Re: The rate of a certain chemical reaction is directly proportional   [#permalink] 09 Sep 2017, 10:42
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