AP Chemistry 4.2 Net Ionic Equations Questions

Practice AP Chemistry Unit 4.2 questions on representing physical and chemical processes with balanced equations while conserving atoms, charge, and reacting aqueous species.

Exam points

Use particulate models and stoichiometry to explain concentration, precipitation, and particle composition changes.
Calculate molarity, dilution, and reaction quantities from balanced equations, volumes, and measured data.

Covered syllabus points

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

[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.

For the correct balanced equation (state symbols not required): 1 point
Accept one of the following:

- $\mathrm{CaCO}_{3}(s)+2 \mathrm{H}^{+}(a q) \rightarrow \mathrm{Ca}^{2+}(a q)+\mathrm{CO}_{2}(g)+\mathrm{H}_{2} \mathrm{O}(l)$

- $\mathrm{CaCO}_{3}(s)+2 \mathrm{H}_{3} \mathrm{O}^{+}(a q) \rightarrow \mathrm{Ca}^{2+}(a q)+\mathrm{CO}_{2}(g)+3 \mathrm{H}_{2} \mathrm{O}(l)$

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Covered syllabus points

Question 1