Practice Quiz

Praxis II: Chemistry Exam Prep

Category - General Chemistry

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Which of the following statements correctly identifies a difference between a physical change and a chemical change?
  1. New atoms are formed in a chemical change but not in a physical change.
  2. Energy is conserved in a physical change but not in a chemical change.
  3. New substances are formed in a chemical change but not in a physical change.
  4. Mass is conserved in a physical change but not in a chemical change.
Explanation
Correct Response: C. Chemical reactions result in the formation of new substances, but physical changes involve changes of state (such as solid to liquid, or liquid to gas). A is incorrect because new substances are formed in a chemical change, but new atoms are not. B is incorrect because the Law of Conservation of Energy applies in both instances. D is incorrect because the Law of Conservation of Mass applies in both instances.
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