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Which of the following is true of all liquids?

Discussion in 'MCAT Study Question Q&A' started by ssjsike, Jul 28, 2011.

  1. ssjsike

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    A. Liquids are always more stable than gases or solids
    B. A higher vapor pressure indicates a lower heat of vaporization.
    C. As the pressure on a liquid increases, the temperature of the liquid decreases.
    D. Fluid pressure is equal at all points in a liquid.

    The answer is B.

    I realize that A and C are wrong, but doesn't D correlate to Pascal's Law? What would make that choice wrong in comparison to choice B?
     
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  3. vayntraubinator

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    D is true only for an ideal liquid. But that's making an assumption. B is true for all liquids because higher vapor pressure means weaker intermolecular bonds, so more interaction with the atmosphere. Hence, you'd require less energy to vaporize that liquid. And this property would be applicable to all liquids, as demanded by the question stem.
     
  4. ssjsike

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    Thank you! That's a very informative answer.
     
  5. ih2183

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    D is wrong because of Pascal's laws. A point deeper in the liquid will experience a greater weight of liquid.
     
  6. englishtablet

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    D is wrong because the pressure is equal at all points where the depth is same.
     

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