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Is the Princeton Review trustworthy?

DarkseerDarkseer Registered User Posts: 8 New Member
I've bought two Princeton Review (SAT II physics/Chemistry) to get prepare. The results is just fine when I do the practice tests. But is the result trustworthy? I've found little error in the books (little, but little is more than none).


By the way, this is part of a chemistry problem which I think its answer is wrong:
Q: Consider the reaction: 2NOCl(g) <--> 2NO(g)+Cl2(g)
Does a decrease in the volume of the reaction vessel serve to decrease the concentration of Cl2?

The answer in the book is yes. Well, of course after a decrease in the volume the equilibrium shift to the left. But you increase the concentration of Cl2 when you decrease the volume, don't you? And after some calculation I believe that the concentration is increased...
Post edited by Darkseer on

Replies to: Is the Princeton Review trustworthy?

  • Ruella76Ruella76 Registered User Posts: 311 Junior Member
    I'm not completely sure, but I think the Princeton Review is right on this one. A shift to the left would mean that the concentration of the reactants is increasing and the concentration of the products is increasing. Since Cl2 is a reactant, its concentration would decrease.
  • chillaxinchillaxin Registered User Posts: 965 Member
    I believe that you're right on the concentration problem. All prep books are known to make mistakes, and PR is no different, although I believe it has less errors than the other books (e.g. Barron's and Sparknotes).
This discussion has been closed.