Item AM032005: The average speed of water molecules in a closed container kept at a constant temperature stays the same.

A container of water was closed and kept at a constant temperature. Which of the following statements about the motion of the water molecules is TRUE?

  1. The water molecules stopped moving.
  2. The average speed of the water molecules stayed the same.
  3. The average speed of the water molecules increased a little bit.
  4. The average speed of the water molecules decreased a little bit.

Distribution of Responses

Chart showing distrubtion of responses for Item AM032005

Percent of students responding correctly

Overall56%
Grades 6–852%
Grades 9–1267%
Male57%
Female55%
Primary Language is English57%
Primary Language is not English44%

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