Which of the following statements about chemical reactions is TRUE?

  1. All chemical reactions are dangerous.
  2. Some chemical reactions can be reversed.
  3. Chemical reactions occur only in a laboratory.
  4. Chemical reactions require starting with at least two substances.

Distribution of Responses

Chart showing distrubtion of responses for Item SC073002

Percent of students responding correctly

Overall19%
Grades 6–816%
Grades 9–1224%
Male21%
Female17%
Primary Language is English19%
Primary Language is not English19%

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