AP Chemistry 2025 Questions And Answers

AP Chemistry is an Advanced Placement (AP) course and examination offered by the College Board in the United States and Canada. It’s designed to be the equivalent of a rigorous, introductory college-level general chemistry course. High school students who successfully complete the course and pass the exam may be able to earn college credit or advanced placement at many universities.

Questions And Worked Solutions For AP Chemistry 2025 Exam

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AP Chemistry 2025 Free Response Questions - Complete Paper (pdf)

2025 AP Chemistry Free Response #1 Answers

An incomplete mass spectrum for magnesium is shown in the diagram.
The percent abundance of magnesium-24 is 79%. The percent abundances of the other two natural isotopes of magnesium, magnesium-25 and magnesium-26, are approximately equal.
i. Complete the mass spectrum in part A by drawing thick lines in the appropriate locations to represent the percent abundance of magnesium-25 and magnesium-26.
ii. Describe the difference in atomic structure that accounts for the difference in mass between magnesium-25 and magnesium-26. …

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2. Answer the following questions about ascorbic acid (vitamin C).
   A. A student combusts a sample of ascorbic acid, C_xH_yO_x, to determine its chemical composition. The only products of the reaction are 0.2400 mol of CO₂ and 2.883 g of H₂O.
   i. Calculate the number of moles of H₂O produced.
   ii. The mole ratio of carbon (C) to oxygen (O) is 1:1 in ascorbic acid. Based on this information and your answer to part A (i), determine the empirical formula of ascorbic acid. …

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3. White phosphorus is composed of P₄ molecules with a tetrahedral structure, as shown in the diagram on the left. Each P atom is bonded to the other three P atoms by single bonds, as shown in the incomplete Lewis diagram on the right. …

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4. A scientist is investigating the properties of a mixture of CH₃OH and H₂CO. The scientist generates the following diagram to represent the mixture.. …

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5. Complete Lewis diagrams and some physical properties for compounds X and Y are given.
   A. Based on VSEPR theory, predict the geometry around the S_i atom in compound Y.
   B. A student claims that compound Y has a higher boiling point than that of compound X because compound Y has stronger London dispersion forces. Do you agree or disagree? Justify your answer. …

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6. A scientist constructs a galvanic cell as shown in the diagram. As the cell operates, the Zn(s) electrode increases in mass and the Al(s) electrode decreases in mass. A data table with the standard reduction potentials for the substances follows the diagram. …

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7. Answer the following questions about the glycolate ion, which acts as a base in aqueous solution. A Lewis diagram for the ion is provided. …

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