ASPECt
Energy: Forms, Transformation, Transfer, and Conservation
Item RG198001: Measuring an decrease in temperature during a chemical reaction is an indicator that energy was taken in during a chemical reaction.
A student places some baking soda and a jar of lemon juice in a plastic bag and seals the bag. She shakes the bag so that the lemon juice spills out of the jar and mixes with the baking soda inside the bag. The student observes that bubbles form and the bag expands.
The student measured the temperature inside the bag before and after the reaction. She found that the temperature decreased during the reaction. Was energy released to the surroundings during the reaction or was energy being taken in and why?
- Energy was released because the temperature inside the bag decreased.
- Energy was released because energy is released whenever a chemical reaction occurs.
- Energy was taken in because the temperature inside the bag decreased.
- Energy was taken in because energy is required for a chemical reaction to occur.
- Distribution of Responses
- Scale Score for Item Difficulty
(200[Easy]-800[Difficult]) - 546
- Students Responding Correctly
| Group | Correct | Total | Percent |
|---|---|---|---|
| Overall | 363 | 1757 | 21% |
| Grades | |||
| 4–5 | 52 | 299 | 17% |
| 6–8 | 156 | 847 | 18% |
| 9–12 | 155 | 611 | 25% |
| Gender | |||
| Male | 174 | 808 | 22% |
| Female | 179 | 914 | 20% |
| Primary Language | |||
| English | 319 | 1572 | 20% |
| Other | 34 | 141 | 24% |
- Disciplinary Core Ideas
- PS1.B Some chemical reactions release energy, others store energy.