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100 points for $49 worth of Veritas practice GMATs FREE VERITAS PRACTICE GMAT EXAMS Earn 10 Points Per Post Earn 10 Points Per Thanks Earn 10 Points Per Upvote ## GMAT prep - Rate of chemical ##### This topic has 4 member replies ## GMAT prep - Rate of chemical A rate of a certain chemical reaction is directly proportional to the square of tge concentration of chemical A present and inversely proportional to a concentration of chemical B present. If the concentration of chemical B is increased by 100%, which of the following is clost to the percent change in the concentration of chemical A required to keep the reaction rate unchanged? 1. 100% decrease 2. 50% decrease 3. 40% decrease 4. 40% increase 5. 50% increase I have no idea what it is about. Thanks for explanation. Junior | Next Rank: 30 Posts Joined 09 Jul 2008 Posted: 18 messages I'm so sorry, I should have posted it in problem solving section. Sorry for my mistake. Master | Next Rank: 500 Posts Joined 19 May 2008 Posted: 246 messages Upvotes: 7 Test Date: 06/30/2008 Target GMAT Score: 730 Option D. sqauare root of 2 (approx)= 1.4 Regards, _________________ Cubicle Bound Misfit Newbie | Next Rank: 10 Posts Joined 12 Mar 2008 Posted: 7 messages Test Date: Aug 2008 Target GMAT Score: 730 Lets say rate = K * (a^2 / b) - Eq1 Now b is increased by 100% therefore new rate = K * (a1^2/2b) - Eq2 where new a is = a1 Eq1 = Eq2 (a^2 / b) = (a1^2/2b) a1 = Sqrt(2) * a = 1.414a Clearly a is approx 40% increased! D is the answer! OA please? Junior | Next Rank: 30 Posts Joined 09 Jul 2008 Posted: 18 messages You're right, answer is D. Thanks guys for explanation. • FREE GMAT Exam Know how you'd score today for$0

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