AP Chemistry · Free-response questions 2015

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

Question 3

Open answer
Question 3 — 3. Potassium sorbate, K C 6 H 7 O 2 (molar mass 150 decimal point grams per mole) is commonly added to diet soft drinks as a preservative. A stock solution of K C 6 H 7 O 2 aqueous of known concentration must be…

Source: College Board — AP Chemistry, Free-response questions, 2015

Question 4

Open answer
Question 4 — 4. Answer the following questions about the solubility of C a, ope n par en thesis O H close parenthesis, subscript 2. Open parenthesis K s p equals one point three times ten to the negative 6 close parenthesis . (a)…

Source: College Board — AP Chemistry, Free-response questions, 2015

Question 5

Open answer
Question 5 — N a 2 C 37 H 34 N 2 S 3 O 9, which is blue, plus O C l with a negative one charge, react to produce the products, which are colorless. 5. Blue food coloring can be oxidized by household bleach (which contains O C l with…

Source: College Board — AP Chemistry, Free-response questions, 2015

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Question 7

Open answer
Question 7 — 7. Aluminum metal can be recycled from scrap metal by melting the metal to evaporate impurities. (a) Calculate the amount of heat needed to purify One point zero zero mole of A l originally at 298 K by melting it. The…

Source: College Board — AP Chemistry, Free-response questions, 2015

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