AP Chemistry 9.1 A Identify the Sign and Relative Magnitude of the Entropy Change Associated with Chemical or Physical Processes Questions

Practice AP Chemistry questions on predicting the sign and relative size of entropy changes from particle dispersion, phase, temperature, and gas moles.

Exam points

Explain how acid-base reactions involve proton transfer and conjugate pairs in solution.
Apply pH, pOH and equilibrium relationships to calculate concentrations and predict acid-base behavior.

[Maximum number: 1]

White phosphorus is composed of $\mathrm{P}_{4}$ molecules with a tetrahedral structure, as shown in the diagram on the left. Each P atom is bonded to the other three P atoms by single bonds, as shown in the incomplete Lewis diagram on the right.

Figure for Question AP Chemistry 9.1 A Identify the Sign and Relative Magnitude of the Entropy Change Associated with Chemical or Physical Processes Questions question 1 — AP Chemistry

The reaction of white phosphorus with oxygen to form $\mathrm{P}_{4} \mathrm{O}_{10}(s)$ is thermodynamically favorable at 298 K. The reaction is represented by equation 1.

The entropy change of the reaction, $\Delta S^{\circ}$ , is negative. Using particle-level reasoning, explain why the entropy decreases as the reaction progresses.

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AP Chemistry 9.1 A Identify the Sign and Relative Magnitude of the Entropy Change Associated with Chemical or Physical Processes Questions question 1