Visit this thread to beta-test StudySchedule.org. StudySchedule is a free nonprofit site that builds dynamic MCAT study schedules unique for your needs and timeline.

BR question. Confusing~~

Discussion in 'MCAT Study Question Q&A' started by chaser0, May 5, 2012.

  1. SDN is made possible through member donations, sponsorships, and our volunteers. Learn about SDN's nonprofit mission.
  1. chaser0

    chaser0 2+ Year Member

    125
    0
    May 10, 2009
    Solute X does not dissociate once in solution. If another impurity were chosen instead that can dissociate into two particles in solution, how would the freezing point be affected?
    A.) the freezing point will decrease by twice as much as expected, if the impurity does not dissociate.
    B.) the FP would decrease by as much as expected, if the impurity does not dissociate.
    C.) the freezing point would decrease by half as much as expected, if the impurity does not dissociate.
    D.) the FP would be constant.


    Anyone want to give an answer and their reason??
     
    Last edited: May 5, 2012
  2. SDN Members don't see this ad. About the ads.
  3. Dasypus

    Dasypus

    193
    1
    Apr 25, 2011
    .
     
    Last edited: May 25, 2012
  4. chaser0

    chaser0 2+ Year Member

    125
    0
    May 10, 2009
    Wait what? That doesnt make any sense.

    A says it does NOT dissociate, meaning that the new solute has the same effect as the original solute X.
    The FP shouldnt be any different at all between X and the new.
     
  5. chaser0

    chaser0 2+ Year Member

    125
    0
    May 10, 2009
    Oh and sorry I wrote the answer choices wrong.

    Fixed it
    B and C are exclusive
     
  6. Dasypus

    Dasypus

    193
    1
    Apr 25, 2011
    .
     
    Last edited: May 25, 2012
  7. chaser0

    chaser0 2+ Year Member

    125
    0
    May 10, 2009
    Oh wait i think ur right.

    The wording of the answer Choices are funny.
    What they mean to say is:
    The FP would decrease by twice as much compared to another experiment where the impurities did not dissociate.

    :mad:


    So yeah, A haha
     
  8. MedPR

    MedPR Banned

    18,604
    40
    Dec 1, 2011
    MDApps:
    Going with B. FP is a colligative property meaning that only the number of particles matters. If something doesn't dissociate then the vant hoff factor is 1. If something that can dissociate into two things, but doesn't dissociate in the solution given then the van't hoff factor is still 1.
     
  9. chaser0

    chaser0 2+ Year Member

    125
    0
    May 10, 2009
    Yeah answer is A, the problem is just worded extremely poorly~~

    I thought it was B too
     

Share This Page