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AP Chemistry 3.3 Solids Liquids and Gases Questions

Practice AP Chemistry 3.3 questions on representing solid, liquid, and gas phases with particulate models showing spacing, motion, and interactions.

Syllabus
Effective Fall 2025
Course
AP Chemistry

Exam points

  • Apply energy diagrams and thermodynamic data to compare reaction enthalpy, activation energy, and pathway changes.
  • Explain how catalysts alter activation barriers without changing reaction enthalpy or equilibrium composition.

Covered syllabus points

3.3.A—Represent the differences between solid, liquid, and gas phases using a particulatelevel model

Question 1

[Maximum number: 1]

A scientist is investigating the properties of a mixture of CH3OH\mathrm{CH}_{3} \mathrm{OH} and H2CO\mathrm{H}_{2} \mathrm{CO}. The scientist generates the following diagram to represent the mixture.

Figure for Question 1 — AP Chemistry
Figure for Question 1 — AP Chemistry
Figure for Question 1 — AP Chemistry
Figure for Question 1 — AP Chemistry
Figure for Question 1 — AP Chemistry

The scientist plans to cool a gaseous mixture of CH3OH\mathrm{CH}_{3} \mathrm{OH} and H2CO\mathrm{H}_{2} \mathrm{CO} to form a liquid mixture and finds data on the two compounds. The data are summarized in the table.

Table for Question 1 — AP Chemistry

Propose a temperature to which the mixture should be cooled such that CH3OH\mathrm{CH}_{3} \mathrm{OH} and H2CO\mathrm{H}_{2} \mathrm{CO} will both be liquids.

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