Sticky Molecules Gizmo Quiz

Which pair of water molecules shown below are most likely to form a hydrogen bond in their current positions?

• Pair I

• Pair II

• Pair III

• All are equally likely to bond in their current positions.

What is the best explanation for the difference in shape between the two drops shown below?

• Hexane is nonpolar and has greater cohesion than glycerin.

• Glycerin is nonpolar and has greater cohesion than hexane.

• Hexane is polar and has greater cohesion than glycerin.

• Glycerin is polar and has greater cohesion than hexane.

Which of the following provides the best explanation for why the water drop does not slide off the inclined plane?

• The polar water molecules are absorbed by the underlying surface.

• The polar water molecules cause the surface to become temporarily charged, causing adhesion.

• The polar water molecules exert strong cohesive forces on one another.

• The polar water molecules are repelled by the nonpolar surface.

As shown below, a ring can be lifted through a fluid without breaking the surface film due to surface tension. In which type of liquid would you expect to find the greatest surface tension, and why?

• Polar liquids, because they have strong cohesive forces.

• Nonpolar liquids, because they have weak cohesive forces.

• Polar liquids, because they have weak cohesive forces.

• Nonpolar liquids, because they have strong cohesive forces.

Why is capillary rise less with hexane than with water, as shown below?

• Hexane is less polar.

• Hexane has less cohesion between its molecules.

• Hexane creates weaker adhesive forces.

• All of the above.