AP Chemistry Question 433: Answer and Explanation

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Question: 433

11. Chemical reactions can be classified as either heterogeneous or homogeneous. Which of the following equations below is best classified as a heterogeneous reaction?

  • A. 2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g)
  • B. C2H5OH(aq) + O2(aq) → HC2H3O2(aq) + H2O(aq)
  • C. C(s) + H2O(g) → H2(g) + CO(g)
  • D. C2H2(g) + 5N2O(g) → CO2(g) + H2O(g) + 5N2(g)

Correct Answer: C


(C) All the other reactions have reactants and products in the same state.