A student is asked to draw a model that shows evaporation of a liquid. Balls will represent molecules, and arrows will represent motion. Longer arrows mean faster motion. Describe how you would show the spacing and motion of the molecules in the liquid state.

Describe how you would show the spacing and motion of the molecules in the gas state above the liquid surface.

Explain how you would show that evaporation is taking place, rather than condensation.

The arrows above the liquid will be much longer than the arrows in the liquid and the arrows will have greater space between them above the liquid than in the liquid.

Evaporation implies the conversion of a liquid to gas. This happens at all temperatures. The molecules that are close to the surface may escape the attractive forces of the liquid and transform into vapor.

The molecules in the vapor phase move faster then the molecules in the liquid phase hence the arrows are longer above the liquid than in the liquid. Also, the space between the arrows is greater above the liquid than in the liquid. Since the arrows are pointing out of the liquid rather than towards, evaporation rather than condensation is taking place.

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