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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
Students Responding Correctly
Group Correct Total Percent
Overall 521 2751 19%
  6–8 258 1638 16%
  9–12 261 1093 24%
Primary Language

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NGSS does not address the question of whether chemical reactions may be reversible.