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1001 MCAT Chemistry- Question 562 and 575
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prabjotpanchhi
#1 Posted : Friday, July 15, 2011 11:16:00 PM
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562) Isn't a salt considered a non volatile solute? Therefore, it would prevent some of the liquid molecules to remain in the liquid phase and not partition into gas molecules. I thought the answer would be C.

575) According to the Prep 101 class room companion, during a phase change the temperature remains constant (Pg 152). I thought B would be incorrect.
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selenahuang
#2 Posted : Wednesday, July 20, 2011 12:50:33 AM
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562) IV utilizes some properties that is not covered in the books. In this case, we are not dealing with a simple liquid-vapour equilibrium, rather, we have dissolved gas (CO2) in the liquid. Having salt molecules as nucleating centres can help gas bubbles form around it and escape.

575) The CC did not cover the different TYPES of solids and focused on crystal solids alone. (But there's info on it in the EK book). Hot chocolate is an amorphous solid, as seen in the stem (grows softer and viscous). Amorphous solids do NOT have defined melting points.
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