---
title: "AP Chemistry Guided Practice"
description: "Fiveable has 27,339 AP Chemistry multiple-choice practice questions across 9 units, plus 450 stimulus-based question sets built around a source. Practice one unit or topic at a time."
canonical: "https://fiveable.me/ap-chem/guided-practice"
type: "guided-practice"
subject: "AP Chemistry"
---

# AP Chemistry Guided Practice

## Overview

Fiveable has 27,339 AP Chemistry multiple-choice practice questions across 9 units, plus 450 stimulus-based question sets built around a source. Practice one unit or topic at a time.

## Practice Questions by Unit

- Unit 1 – Atomic Structure & Properties: 1,893 multiple-choice questions, 37 stimulus sets
- Unit 2 – Compound Structure and Properties: 1,506 multiple-choice questions, 37 stimulus sets
- Unit 3 – Properties of Substances and Mixtures: 2,810 multiple-choice questions, 70 stimulus sets
- Unit 4 – Chemical Reactions: 2,369 multiple-choice questions, 39 stimulus sets
- Unit 5 – Kinetics: 3,494 multiple-choice questions, 54 stimulus sets
- Unit 6 – Thermochemistry: 3,306 multiple-choice questions, 45 stimulus sets
- Unit 7 – Equilibrium: 4,074 multiple-choice questions, 44 stimulus sets
- Unit 8 – Acids & Bases: 3,993 multiple-choice questions, 62 stimulus sets
- Unit 9 – Thermodynamics and Electrochemistry: 3,894 multiple-choice questions, 62 stimulus sets

## Sample Question

A heating curve plots temperature versus heat added for a pure substance. The horizontal segment representing vaporization is significantly longer than the horizontal segment representing melting. Which conclusion about the standard entropy of vaporization (ΔS°vap) compared to the standard entropy of fusion (ΔS°fus) is best supported by this graphical difference?

- (A) ΔS°vap > ΔS°fus because the gas phase has greater matter dispersal than the liquid.
- (B) ΔS°vap < ΔS°fus because the higher temperature reduces the calculated entropy change.
- (C) ΔS°vap = ΔS°fus because the mass of the substance remains constant during heating.
- (D) ΔS°vap ≈ 0 because the temperature remains constant throughout the phase transition.

**Answer: (A)** Interpreting the graph shows that vaporization requires more energy (longer segment) than fusion. Since ΔS = q/T, the large heat input combined with the massive increase in disorder (dispersal of matter) when forming a gas results in ΔS°vap being significantly larger than ΔS°fus.

## Related Practice

- [FRQ 1 Long Answer practice: Long Answer Question (FRQ 1) questions scored by part](/ap-chem/frqs/frq-1)
- [FRQ 2 Long Answer practice: Long Answer Question (FRQ 2) questions scored by part](/ap-chem/frqs/frq-2)
- [FRQ 3 Long Answer practice: Long Answer Question (FRQ 3) questions scored by part](/ap-chem/frqs/frq-3)
- [FRQ 4 Short Answer practice: Short Answer Question (FRQ 4) questions scored by part](/ap-chem/frqs/frq-4)
- [FRQ 5 Short Answer practice: Short Answer Question (FRQ 5) questions scored by part](/ap-chem/frqs/frq-5)
- [FRQ 6 Short Answer practice: Short Answer Question (FRQ 6) questions scored by part](/ap-chem/frqs/frq-6)
- [FRQ 7 Short Answer practice: Short Answer Question (FRQ 7) questions scored by part](/ap-chem/frqs/frq-7)
- [AP Chemistry unit tests: a timed practice test for every unit](/ap-chem/unit-test)
- [AP Chemistry full-length practice exams](/ap-chem/practice-exams)
- [AP Chemistry subject hub](/ap-chem)

## About This Document

Canonical Fiveable pages are available as Markdown at the same path plus `.md`.

- [llms.txt](https://fiveable.me/llms.txt): index of Fiveable's sections and URL patterns
- [llms-full.txt](https://fiveable.me/llms-full.txt): complete subject and unit listing
- [MCP server](https://fiveable.me/mcp): call Fiveable as tools instead of fetching pages (`https://fiveable.me/api/mcp`)
- [MCP server for AP teachers](https://fiveable.me/mcp/teachers): a teacher's classes, assignments and AP-rubric grading (`https://fiveable.me/api/mcp/teacher`)