2010 AP Chemistry Exam. Section 1 50% of exam 90 min 75 Multiple Choice Questions (without calculator and only a basic periodic table) Section 2 50% of exam 95 min Part A 60% of Section 2 55 min (with calculator, p. table, SRP, & formula pages) Part B 40% of Section 2 40 min
75 Multiple Choice Questions
(without calculator and only a basic periodic table)
Section 2 50% of exam 95 min
Part A 60% of Section 2 55 min
(with calculator, p. table, SRP, & formula pages)
Part B 40% of Section 2 40 min
(without calculator; with p.table, SRP, & formulas)AP Exam Format
Part A Equilibrium Problem
Reactions (3 parts)
Essay*Components of Section 2
*Laboratory question—may appear EITHER in Part A and involve quantitative analysis of laboratory-based data OR in Part B as an essay question based on a laboratory experiment
Part A55 minutes (with calculator) % Sect.2 Score
Part B40 minutes (no calculator) % Sect.2 Score Reactions Question (3, with no choice) 10%
*One of the other problems or essays will be based on laboratory.
These are net ionic equations!
4a. Solid potassium chlorate is strongly heated resulting in a change in the oxidation numbers of both chlorine and oxygen.
(ii)What is the oxidation number of chlorine before and after the reaction?
4b. Solid silver chloride is added to a solution of concentrated hydrochloric acid forming a complex ion.
(ii) Which species acts as a Lewis base in the reaction? Explain.
4c. A solution of ethanoic (acetic) acid is added to a solution of barium hydroxide.
(ii) Explain why a mixture of equal volumes of equimolar solutions of ethanoic acid and barium hydroxide is basic.
4d. Ammonia gas is bubbled into a solution of hydrofluoric acid.
(ii) Identify a conjugate acid-base pair in the reaction.
4e. Zinc metal is placed in a solution of copper(II) sulfate.
(i) Zn + Cu2+ Zn2+ + Cu
(ii) Describe the change in color of the solution that occurs as the reaction proceeds.
4f. Hydrogen phosphide (phosphine) gas is added to boron trichloride gas.
(ii) Which species acts as a Lewis acid in the reaction? Explain.
4g. A solution of nickel(II) bromide is added to a solution of potassium hydroxide.
(ii) Identify the spectator ions in the reaction mixture.
4h. Hexane is combusted in air.
(ii) When one molecule of hexane is completely combusted, how many molecules of products are formed?