ASPECt
Energy: Forms, Transformation, Transfer, and Conservation
Item RG181001: Measuring an increase in temperature during a chemical reaction is an indicator that the chemical energy of the reactants is greater than the chemical energy of the products.
A student combines Substance X with Substance Y. The two substances react completely to form Substance Z. The student measures an increase in temperature as the reaction occurs. How does the chemical energy of the reactants (Substances X and Y) compare to the chemical energy of the product (Substance Z)?
- The chemical energy of the reactants is greater than the chemical energy of the products.
- The chemical energy of the reactants is less than the chemical energy of the products.
- The chemical energy of the reactants is the same as the chemical energy of the products.
- The only way to compare the chemical energy of the reactants and products is to also know the identity of the substances.
- Distribution of Responses
- Scale Score for Item Difficulty
(200[Easy]-800[Difficult]) - 528
- Students Responding Correctly
| Group | Correct | Total | Percent |
|---|---|---|---|
| Overall | 285 | 987 | 29% |
| Grades | |||
| 4–5 | N/A | N/A | N/A |
| 6–8 | 183 | 639 | 29% |
| 9–12 | 102 | 348 | 29% |
| Gender | |||
| Male | 134 | 456 | 29% |
| Female | 140 | 505 | 28% |
| Primary Language | |||
| English | 255 | 865 | 29% |
| Other | 22 | 99 | 22% |
- Disciplinary Core Ideas
- PS1.B Some chemical reactions release energy, others store energy.