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
Students Responding Correctly
Group Correct Total Percent
Overall 2141 3834 56%
  6–8 1448 2792 52%
  9–12 688 1033 67%
Primary Language

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See performance expectation MS-PS1-4. Develop a model that predicts and describes changes in particle motion, temperature, and state of a substance when thermal energy is added or removed.