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Item AM044007: As the temperature of a solid iron rod increases, the iron atoms that make up the rod move more quickly.

An artist heats a solid iron rod and bends it into a new shape. What happens to the iron atoms as the temperature of the solid iron rod increases?

  1. The iron atoms move more slowly after they are heated.
  2. The iron atoms move more quickly after they are heated.
  3. The iron atoms were not moving before they were heated, and they are not moving after being heated.
  4. The iron atoms were moving before they were heated, and they continue to move at the same speed after being heated.
Distribution of Responses
Chart showing distrubtion of responses for Item AM044007
Students Responding Correctly
Group Correct Total Percent
Overall 2875 4422 65%
  6–8 1576 2578 61%
  9–12 1295 1831 71%
Primary Language

View data table

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.