Question

A student placed equal volumes of honey and of water in two, identical, open dishes, and left them at room temperature for 8 hours. She observed that the amount of water decreased, but the amount of honey seemed unchanged. Knowing that honey is a highly concentrated solution of sugar in water, which statement should the student make to explain this phenomenon?

Honey has a much lower vapor pressure than pure water has. So, pure water evaporates at a much higher rate.

Honey has a much higher vapor pressure than water has. So, water evaporates at a much higher rate.

Honey has a much lower freezing point than water has. So, water evaporates at a much higher rate.

Honey has no vapor pressure. So, water evaporates at a much higher rate

Answer 1

Honey has a much lower vapor pressure than pure water has. So, pure water evaporates at a much higher rate.

EXPLANATION:

When a nonvolatile solute is added to a solvent, the vapor pressure of the resulting solution is less than that of the pure solvent.

(Because of the attractive forces operating between the solvent and solute molecules, the escaping tendendency of the solvent molecules is reduced)

The difference between the vapor pressures of the pure solvent and the solution is called the lowering of vapor pressure

Lowering of vapor pressure = Vapor pressure of the pure solvent - Vapor pressure of the solution

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Honey is a highly concentrated solution of sugar in water,Hence honey has a much lower vapor pressure than pure water has. So, pure water evaporates at a much higher rate..