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Item AM044005: As a solid iron rod cools down, the iron atoms slow down but do not stop moving.

An artist heats a solid iron rod and bends it into a new shape. The iron cools down when the artist is finished. What happens to the iron atoms as the solid iron rod cools?

  1. The iron atoms move more quickly.
  2. The iron atoms slow down and stop moving.
  3. The iron atoms slow down but do not stop.
  4. The speed of the iron atoms does not change.
Distribution of Responses
Chart showing distrubtion of responses for Item AM044005
Students Responding Correctly
Group Correct Total Percent
Overall 2234 4915 46%
  6–8 1125 2770 41%
  9–12 1105 2128 52%
Primary Language

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See NGSS 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.