Chemistry Practice Problems Mixtures Practice Problems Solution: The first diagram depicts a compound in its liquid...

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Solution: The first diagram depicts a compound in its liquid state.Which of the other diagrams best depicts the compound after it has evaporated into a gas?

Problem

The first diagram depicts a compound in its liquid state.
A collection of molecules consisting of two gray spheres combined with a lighter-colored sphere. The molecules are relatively close together with no ordered arrangement.

Which of the other diagrams best depicts the compound after it has evaporated into a gas?
Four diagrams, a, b, c, and d. Diagram a is a collection of molecules consisting of two gray spheres combined with a lighter-colored sphere. The molecules are relatively far apart with no ordered arrangement. Diagram b is a collection of isolated gray and lighter-colored spheres randomly distributed throughout the sample. Diagram c is a collection of molecules, some of which are composed of two gray spheres and others composed of two lighter-colored spheres. Diagram d is a collection of gray spheres, and gray and lighter-colored spheres combined as a molecules randomly distributed throughout the sample.

Solution

Evaporation of a liquid into a gas is a physical change. This means there's no change in the composition of the compound in the gaseous state, and the molecules will look the same in both the liquid and gaseous state.

Recall that gases have more empty space between their molecules than liquids.

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