AP Chemistry · Free-response questions 2019

7 questions, each with its course unit and the official scoring guidelines.

Question 3

Open answer
Question 3 — 3. A student is given 50.0 milliliters of a solution of N a 2 C O 3 of unknown concentration. To determine the concentration of the solution, the student mixes the solution with excess 1.0 mo lar C a, open parenthesis,…

Source: College Board — AP Chemistry, Free-response questions, 2019

Question 6

Open answer
Question 6 — 6. Nitrogen dioxide, N O 2, gas, is produced as a by-product of the combustion of fossil fuels in internal combustion engines. At elevated temperatures N O 2, gas decomposes according to the equation below. 2 N O 2, gas…

Source: College Board — AP Chemistry, Free-response questions, 2019

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Question 7

Open answer
Question 7 — 6 H with a positi ve one charge, aqueous, plus 2 M n O 4 with a negative one charge, aqueous, plus 5 H 2 C 2 O 4, aqueous, reacts to produce, 10 C O 2, gas, plus 8 H 2 O, liquid, plus 2 M n with a positive 2 charge,…

Source: College Board — AP Chemistry, Free-response questions, 2019

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