AP Chemistry 3.3: Solids, Liquids, and Gases

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

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.

[Maximum number: 1]

A scientist is investigating the properties of a mixture of $\mathrm{CH}_{3} \mathrm{OH}$ and $\mathrm{H}_{2} \mathrm{CO}$ . The scientist

generates the following diagram to represent the mixture.

The scientist plans to cool a gaseous mixture of $\mathrm{CH}_{3} \mathrm{OH}$ and $\mathrm{H}_{2} \mathrm{CO}$ to form a liquid mixture

and finds data on the two compounds. The data are summarized in the table.

Propose a temperature to which the mixture should be cooled such that $\mathrm{CH}_{3} \mathrm{OH}$ and

$\mathrm{H}_{2} \mathrm{CO}$ will both be liquids.

C (i) For a correct proposal:

Point 03

The proposed temperature should be in the range $181 \mathrm{~K}-254 \mathrm{~K}$ .

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