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

Percent of students responding correctly

Grades 6–861%
Grades 9–1271%
Primary Language is English66%
Primary Language is not English58%

View data table