AP Chemistry 2019 Questions And Answers

Questions And Worked Solutions For AP Chemistry 2019 Exam

AP Chemistry 2019 Free Response Questions - Complete Paper (pdf)

2019 AP Chemistry Free Response #1 Answers

1. The compound urea, H₂NCONH₂ , is widely used in chemical fertilizers. The complete Lewis electron-dot diagram for the urea molecule is shown above.
   (a) Identify the hybridization of the valence orbitals of the carbon atom in the urea molecule. …

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2. Answer the following questions relating to the chemistry of the halogens.
   (a) The molecular formulas of diatomic bromine, chlorine, fluorine, and iodine are written below. Circle the formula of the molecule that has the longest bond length. Justify your choice in terms of atomic structure.

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3. A student is given 50.0 mL of a solution of Na₂CO₃ of unknown concentration. To determine the concentration of the solution, the student mixes the solution with excess 1.0 M Ca(NO₃)₂(aq), causing a precipitate to form.
   The balanced equation for the reaction is shown below.

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4. A student is doing experiments with CO₂(g). Originally, a sample of the gas is in a rigid container at 299 K and 0.70 atm. The student increases the temperature of the CO₂(g) in the container to 425 K.

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5. The complete photoelectron spectrum of an element in its ground state is represented below.

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6. Nitrogen dioxide, NO₂(g), is produced as a by-product of the combustion of fossil fuels in internal combustion engines. At elevated temperatures NO₂(g) decomposes according to the equation below

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7. A student dissolved a 0.139 g sample of oxalic acid, H₂C₂O₄ , in water in an Erlenmeyer flask. Then the student titrated the H₂C₂O₄ solution in the flask with a solution of KMnO₄ , which has a dark purple color. The balanced chemical equation for the reaction that occurred during the titration is shown above.

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