14
AssignmentMultiple Choice

Intermolecular Forces

Question 14 • *26-27 CFISD TX-Chemistry A CR

Adding soap to water disrupts the hydrogen bonding between water molecules. A water strider is standing on the surface of a dish of water. What is most likely to happen if a drop of dish soap is added to the water?

Answer
A
The water strider will be able to move more quickly over the water’s surface because of reduced friction.
B
The water strider will have more difficulty moving its feet because they will be more strongly attracted to the water.
C
The water strider will be unable to remain on the water’s surface because of the loss of surface tension in the water.

Explanation

Water’s hydrogen bonds create surface tension, which supports a water strider on the surface. Soap disrupts those bonds and lowers the surface tension, so the water may no longer support the strider and it will be unable to remain on the surface. Choice C describes this effect.

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