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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
Answer Choice
Overall
Grades
Gender
Primary Language
 
n = 2751
6–8
n = 1638
9–12
n = 1093
Male
n = 1266
Female
n = 1428
English
n = 2432
Other
n = 243
A. All chemical reactions are dangerous. 11% 11% 11% 12% 10% 10% 17%
B. Some chemical reactions can be reversed. 19% 16% 24% 21% 17% 19% 19%
C. Chemical reactions occur only in a laboratory. 7% 8% 7% 8% 7% 8% 6%
D. Chemical reactions require starting with at least two substances. 63% 66% 58% 59% 67% 64% 58%