Find all School-related info fast with the new School-Specific MBA Forum

It is currently 24 Oct 2014, 19:26

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

The rate of a certain chemical reaction is directly

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
avatar
Joined: 24 Oct 2006
Posts: 341
Followers: 1

Kudos [?]: 16 [0], given: 0

The rate of a certain chemical reaction is directly [#permalink] New post 16 Dec 2006, 23:02
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 chemicl B present. If the concentration of chemical B is increased by 100% which of the following is the closest to the percentage change in the concentration of chemical A required to keep the reacton rate unchanged?

100% decrease
50% decrease
40% decrease
40% increase
50% increase

OA: D
Senior Manager
Senior Manager
avatar
Joined: 08 Jun 2006
Posts: 343
Location: Washington DC
Followers: 1

Kudos [?]: 14 [0], given: 0

 [#permalink] New post 17 Dec 2006, 00:00
Say A is the concentration of Chemical A and B is concentration of Chemical B
Then Rate = k * A^2 / B
B is increased by 100%, means the new conc is 2B
Rate = x^2 / 2B = A^2/B
=> new concentration of A = sqrt2 A
% = [(sqrt2*A –A)/A] * 100 = 41% increase
Director
Director
avatar
Joined: 01 Oct 2006
Posts: 500
Followers: 1

Kudos [?]: 16 [0], given: 0

 [#permalink] New post 17 Dec 2006, 00:59
anindyat wrote:
Say A is the concentration of Chemical A and B is concentration of Chemical B
Then Rate = k * A^2 / B
B is increased by 100%, means the new conc is 2B
Rate = x^2 / 2B = A^2/B
=> new concentration of A = sqrt2 A
% = [(sqrt2*A –A)/A] * 100 = 41% increase

A2..
Same approach as anindyat but used numbers instead.
Senior Manager
Senior Manager
avatar
Joined: 24 Oct 2006
Posts: 341
Followers: 1

Kudos [?]: 16 [0], given: 0

 [#permalink] New post 17 Dec 2006, 08:01
I understand. Thank you.
  [#permalink] 17 Dec 2006, 08:01
    Similar topics Author Replies Last post
Similar
Topics:
The rate of a certain chemical reaction is directly misterJJ2u 4 20 Jan 2007, 23:10
The rate of a certain chemical reaction is directly Dilshod 1 07 May 2006, 09:18
The rate of a certain chemical reaction is directly jodeci 4 04 Apr 2006, 01:38
The rate of a certain chemical reaction is directly yaron 3 27 Aug 2005, 10:04
5 Experts publish their posts in the topic The rate of a certain chemical reaction is directly okdongdong 8 07 Aug 2005, 20:00
Display posts from previous: Sort by

The rate of a certain chemical reaction is directly

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.