Original Project
Substances, Chemical Reactions, and Conservation of Matter
Item SC067003: When two liquids are mixed together and a solid forms, the solid is a new substance that was formed during a chemical reaction between the two liquids.
A student mixes two different liquids together. After mixing the liquids, a solid substance forms that cannot be turned back into the starting liquids. The student claims that a chemical reaction occurred. Why is the student correct?
- Because a solid substance is always formed during a chemical reaction
- Because a new substance is always formed during a chemical reaction
- Because a chemical reaction always occurs when two substances are mixed together
- Because the products of a chemical reaction can never be turned back into the starting substances
- Distribution of Responses
- Students Responding Correctly
| Group | Correct | Total | Percent |
|---|---|---|---|
| Overall | 1814 | 4657 | 39% |
| Grades | |||
| 6–8 | 907 | 2449 | 37% |
| 9–12 | 897 | 2179 | 41% |
| Gender | |||
| Male | 872 | 2199 | 40% |
| Female | 906 | 2360 | 38% |
| Primary Language | |||
| English | 1631 | 4120 | 40% |
| Other | 140 | 411 | 34% |