AP Chemistry 4.2: Balanced Chemical Equations

Practice AP Chemistry questions on writing balanced molecular, complete ionic, and net ionic equations while conserving atoms, charge, and relevant aqueous species.

Exam points

Explain how acid-base equilibria and conjugate pairs determine pH, buffering and reaction direction.
Apply Ka, Kb, pH and buffer relationships to calculate concentrations in aqueous systems.

[Maximum number: 1]

Answer the following questions about an experiment in which $\mathrm{CaCO}_{3}(s)$ is combined with HCl(a q), represented by the following balanced equation.

\mathrm{CaCO}_{3}(s)+2 \mathrm{HCl}(a q) \rightarrow \mathrm{CaCl}_{2}(a q)+\mathrm{CO}_{2}(g)+\mathrm{H}_{2} \mathrm{O}(l)

Write the balanced net ionic equation for the reaction.

A student performs an investigation to study factors that affect the rate of the reaction. In each trial the student combines 50.0 mL of HCl(a q) at 21.2°C with 1.00 g of $\mathrm{CaCO}_{3}(s)$ and measures the time required for the reaction to go to completion. The data are given in the following table.

Table for Question 4.2.A—Represent changes in matter with a balanced chemical or net ionic equation: i. For physical changes. ii. For… question 1 — AP Chemistry

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4.2.A—Represent changes in matter with a balanced chemical or net ionic equation: i. For physical changes. ii. For… question 1