2009 DAT Questions, does anyone know how to solve these 3 questions. Thanks.

cas2022

2+ Year Member
May 11, 2015
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Dental Student
50. This is a standard colligative property calculation. Change in temperature= iKfm. i=1 because ethylene glycol does not dissociate, Kf=1.86, and m=molality=(moles solute)/(kg solvent)= 2/1. Multiply them all together and you get -3.75

89. You are correct in saying that the answer is 3. The test said naphthalene, but showed you a picture of anthracene (has one additional ring)

Can't help you with 99, got that wrong too :( There are a ton of mistakes on 2009 that a lot of people have mentioned on separate SDN posts as well!
 
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m617911622

2+ Year Member
Aug 2, 2015
36
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Status
Pre-Dental
50. This is a standard colligative property calculation. Change in temperature= iKfm. i=1 because ethylene glycol does not dissociate, Kf=1.86, and m=molality=(moles solute)/(kg solvent)= 2/1. Multiply them all together and you get -3.75

89. You are correct in saying that the answer is 3. The test said naphthalene, but showed you a picture of anthracene (has one additional ring)

Can't help you with 99, got that wrong too :( There are a ton of mistakes on 2009 that a lot of people have mentioned on separate SDN posts as well!
Thankssss
 
Apr 11, 2014
43
0
Hello, can you please explain why the answer to question 89 is 3? I'm not sure I'm understanding why. Thank you!