Rate law quiz for AP Chemistry: 10 questions with answers

by aicko
28 October 202628 October 2026

Quick answer: A rate law, rate = k[A]^m[B]^n, shows how reaction rate depends on reactant concentrations, with orders found by experiment. This AP Chemistry quiz checks rate law with 10 multiple-choice questions and instant feedback; every answer comes with a short explanation.

Rate law quiz for AP Chemistry: 10 questions with answers

This rate law quiz for AP Chemistry has quick multiple-choice questions with instant feedback. Need a refresher first? Read the lesson or do the worksheet on rate law.

Ten multiple-choice questions on orders, units of k, straight-line plots and half-lives. Choose the best option for each, then read the explanation to see which common mistake each wrong option represents.

Level: AP Chemistry · Curriculum: AP Chem Unit 5

Contents

Rate law quiz: the questions

What does the overall order of a reaction equal?

Which units does k have for a first-order reaction?

Doubling [X] raises the rate by a factor of 8. What is the order in X?

Which plot is a straight line for a second-order reaction?

A first-order reaction has t½ = 20 s. What fraction remains after 60 s?

What does the slope of a ln[A] against t plot equal?

Which reaction has a half-life that depends on [A]₀?

A zero-order reaction has k = 0.020 M/s and [A]₀ = 0.40 M. How long until it ends?

What happens to k if a catalyst is added at constant temperature?

Why use initial rates to find a rate law?

Define reaction order — Exponent of a reactant concentration in the rate law.

Units of k, first order — s⁻¹

Units of k, second order — M⁻¹ s⁻¹

Zero-order integrated law — [A] = [A]₀ − kt

First-order integrated law — ln[A] = ln[A]₀ − kt

Second-order integrated law — 1/[A] = 1/[A]₀ + kt

First-order half-life — t½ = 0.693/k

Second-order half-life — t½ = 1/(k[A]₀)

Method of initial rates — Change one concentration at a time, compare rates.

Does k depend on concentration? — No; it depends on temperature and catalyst.

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