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.
Answer Choice |
Overall |
Grades |
Gender |
Primary Language |
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|---|---|---|---|---|---|---|---|---|
| n = 4915 |
6–8 n = 2770 |
9–12 n = 2128 |
Male n = 2368 |
Female n = 2479 |
English n = 4300 |
Other n = 534 |
||
| A. | The iron atoms move more quickly. | 13% | 15% | 10% | 12% | 13% | 12% | 17% |
| B. | The iron atoms slow down and stop moving. | 34% | 35% | 32% | 35% | 33% | 33% | 40% |
| C. | The iron atoms slow down but do not stop. | 45% | 41% | 52% | 45% | 46% | 47% | 34% |
| D. | The speed of the iron atoms does not change. | 8% | 9% | 6% | 8% | 8% | 8% | 10% |