Original Project
Atoms, Molecules, and States of Matter
For any single state of matter, the average speed of the atoms or molecules increases as the temperature of a su…
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?
- The iron atoms move more quickly.
- The iron atoms slow down and stop moving.
- The iron atoms slow down but do not stop.
- The speed of the iron atoms does not change.
- Distribution of Responses
- Students Responding Correctly
| Group | Correct | Total | Percent |
|---|---|---|---|
| Overall | 2234 | 4915 | 46% |
| Grades | |||
| 6–8 | 1125 | 2770 | 41% |
| 9–12 | 1105 | 2128 | 52% |
| Gender | |||
| Male | 1058 | 2368 | 45% |
| Female | 1145 | 2479 | 46% |
| Primary Language | |||
| English | 2022 | 4300 | 47% |
| Other | 179 | 534 | 34% |
- Notes
- 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.