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AP® Chemistry

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Mixing Three Liquids

APCHEM-HOI4LA

In a certain experiment, three liquids were mixed. Five milliliters of methanol ($C{H}_{3}OH$), five milliliters of hexane (${C}_{6}H_{14}$), and five milliliters of water (${H}_{2}O$) were added to a cylindrical tube. The tube was then sealed and shaken to mix the contents completely.

After the liquid had settled, the test tube appeared as shown in the diagram.

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Methanol and water formed a homogeneous mixture on the bottom of the test tube. The hexane formed a separate layer on top of this solution.

Which of the following statements can be used to justify these observations?

A

Methanol and water do not form favorable attractive forces with each other.

B

Hexane does not form favorable attractive forces with either water or methanol.

C

Methanol, water, and hexane all form favorable attractive forces with each other.

D

Hexane is less dense than either methanol or water, so it floats on top.