Question

Which of the following statements correctly characterizes the rate of evaporation of a liquid?
      I. Increases with increasing temperature because molecules have higher kinetic energies.
      II. Increases with increasing surface area of the liquid because more molecules are located at the surface.
      III. Decreases with stronger intermolecular forces because molecules are less able to escape from the surface of the liquid.

II only

III only

I only

I and II only

All three: I, II, and III

Answer 1

I. Increases with increasing temperature because molecules have higher kinetic energies. -TRUE

II. Increases with increasing surface area of the liquid because more molecules are located at the surface.-TRUE

III. Decreases with stronger intermolecular forces because molecules are less able to escape from the surface of the liquid.- TRUE

Because molecules or atoms evaporate from a liquid’S surface, a larger surface area allows more molecules or atoms to leave the liquid, and evaporation occurs more quickly. For example, the same amount of water will evaporate faster if spilled on a table than if it is left in a cup. Higher temperatures also increase the rate of evaporation. At higher temperatures, molecules or atoms have a higher average speed, and more particles are able to break free of the liquid’S surface. For example, a wet street will dry faster in the hot sun than in the shade.

Intermolecular attractions affect the rate of evaporation of a liquid because strong intermolecular attractions hold the molecules in a liquid together more tightly. As a result, liquids with strong intermolecular attractions evaporate more slowly than liquids with weak intermolecular attractions. For example, because water molecules have stronger mutual attractions than gasoline molecules (the electric charges are more evenly distributed in gasoline molecules), gasoline evaporates more quickly than water.

Answer-All Therr-I,II and III