It is currently 19 Nov 2017, 01:56

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.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

The rate of a certain chemical reaction is directly proportional

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Manager
Manager
User avatar
S
Status: Math Tutor
Joined: 12 Aug 2017
Posts: 72

Kudos [?]: 31 [0], given: 13

GMAT 1: 750 Q50 V42
WE: Education (Education)
The rate of a certain chemical reaction is directly proportional [#permalink]

Show Tags

New post 09 Sep 2017, 10:37
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

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

HideShow timer Statistics

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
[Reveal] Spoiler: OA

_________________

Abhishek Parikh
Math Tutor
Whatsapp- +919983944321
Mobile- +971568653827
Website: http://www.holamaven.com

Kudos [?]: 31 [0], given: 13

Manager
Manager
User avatar
S
Status: Math Tutor
Joined: 12 Aug 2017
Posts: 72

Kudos [?]: 31 [0], given: 13

GMAT 1: 750 Q50 V42
WE: Education (Education)
Re: The rate of a certain chemical reaction is directly proportional [#permalink]

Show Tags

New post 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
_________________

Abhishek Parikh
Math Tutor
Whatsapp- +919983944321
Mobile- +971568653827
Website: http://www.holamaven.com

Kudos [?]: 31 [0], given: 13

Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 42249

Kudos [?]: 132646 [0], given: 12326

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

Show Tags

New post 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: https://gmatclub.com/forum/the-rate-of- ... 90119.html
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Kudos [?]: 132646 [0], given: 12326

Re: The rate of a certain chemical reaction is directly proportional   [#permalink] 09 Sep 2017, 10:42
Display posts from previous: Sort by

The rate of a certain chemical reaction is directly proportional

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


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

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

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®.