ASPECt
Energy: Forms, Transformation, Transfer, and Conservation
Item RG158002: As water at the bottom of a jar becomes a little warmer than the water around it, the warmer water will start to rise.
A jar of water is placed over a flame, and the flame warms the water at the bottom of the jar.
What happens to the water at the bottom of the jar before it boils?
- As the water at the bottom of the jar becomes a little warmer than the water around it, the warmer water will start to rise.
- The water at the bottom of the jar will get warmer, but it will not rise.
- The water at the bottom of the jar will get warmer and warmer, but it will not rise until it starts to boil.
- All of the water in the jar will get warmer at the same time, and there will be no movement of the water in the jar as it is heated.
- Distribution of Responses
- Scale Score for Item Difficulty
(200[Easy]-800[Difficult]) - 481
- Students Responding Correctly
| Group | Correct | Total | Percent |
|---|---|---|---|
| Overall | 615 | 1150 | 54% |
| Grades | |||
| 4–5 | N/A | N/A | N/A |
| 6–8 | 347 | 640 | 54% |
| 9–12 | 268 | 510 | 53% |
| Gender | |||
| Male | 278 | 524 | 53% |
| Female | 323 | 604 | 53% |
| Primary Language | |||
| English | 536 | 1001 | 54% |
| Other | 63 | 124 | 51% |