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AP Chemistry 7.1 A Explain the Relationship Between the Occurrence of a Reversible Chemical or Physical Process and the Questions

Practice AP Chemistry questions on recognizing dynamic equilibrium from constant observations while forward and reverse processes continue at equal rates.

Syllabus
Effective Fall 2025
Course
AP Chemistry

Exam points

  • Explain how thermodynamic and kinetic factors determine whether chemical changes occur and at what rate.
  • Apply energy, equilibrium and rate models to predict reaction feasibility and behavior.

AP Chemistry 7.1 A Explain the Relationship Between the Occurrence of a Reversible Chemical or Physical Process and the Questions question 1

[Maximum number: 1]

When heated, calcium carbonate decomposes according to the equation above. In a study of the decomposition of calcium carbonate, a student added a 50.0 g sample of powdered CaCO3(s)\mathrm{CaCO}_{3}(s) to a 1.00 L rigid container. The student sealed the container, pumped out all the gases, then heated the container in an oven at 1100 K. As the container was heated, the total pressure of the CO2(g)\mathrm{CO}_{2}(g) in the container was measured over time. The data are plotted in the graph below.

Figure for Question AP Chemistry 7.1 A Explain the Relationship Between the Occurrence of a Reversible Chemical or Physical Process and the Questions question 1 — AP Chemistry

The student repeated the experiment, but this time the student used a 100.0 g sample of powdered CaCO3(s)\mathrm{CaCO}_{3}(s). In this experiment, the final pressure in the container was 1.04 atm, which was the same final pressure as in the first experiment.

The student claimed that the final pressure in the container in each experiment became constant because all of the CaCO3(s)\mathrm{CaCO}_{3}(s) had decomposed. Based on the data in the experiments, do you agree with this claim? Explain.

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