THE AP Chemistry Exam

Two Sections 1. Multiple Choice 2. Free Response 185 minutes total

Section I 75 Multiple Choice Questions (50% of score) Periodic Table only NO calculator 90 minutes

Grading

Section II: Free Response (50% of score) Periodic Table Equations Sheet Reduction Potential Table

Section II: Free Response Part A Quantitative Section CAN USE calculator 55 minutes

A graphing or scientific calculator is permitted.

Excludes Power Books PDA QWERTY keypad w/paper tapes models that talk require outlet cell phone

#1 Quantitative Problem (Equilibrium) [10% of score]

#2 & #3 Quantitative Problems (any topic) [may be lab] [each 10% of score]

Section II Free Response Part B Equations & Short Answer NO calculator 40 minutes

#4 Three (3) Equations Balance Answer short question (answer in box) [5% of score]

Question 4—Reactions 3 reactions 1 point for reactants 2 points for products 1 point for balance 1 point for question

For each of the following three reactions, in part (i) write a BALANCED equation and in part (ii) answer the question about the reaction. Coefficients should be in terms of lowest whole numbers. Assume that solutions are aqueous unless other- wise indicated. Represent substances in solutions as ions if the substances are extensively ionized. Omit formulas for any ions or molecules that are unchanged by the reaction.

Examples Example: A strip of magnesium is added to a solution of silver nitrate Mg + 2 Ag +  Mg Ag Which substance is oxidized in the reaction? Magnesium metal (Mg)

4. Solid potassium chlorate is strongly heated resulting in a change in the oxidation numbers of both chlorine and oxygen.  (i) 2 KClO 3  2 KCl + 3 O 2 (ii) What is the oxidation number of chlorine before and after the reaction?  Chlorine has an oxidation number of +5 in KClO 3 and -1 in KCl

4. A solution of ethanoic (acetic) acid is added to a solution of barium hydroxide.  i. HC 2 H 3 O 2 + OH -  H 2 O + C 2 H 3 O 2 - (ii) Is a solution composed of stoichiometric amounts of ethanoic acid and barium hydroxide acidic, basic, or neutral? Why  Basic, because of the hydrolysis of the C 2 H 3 O 2 -.

4. Zinc metal is placed in a solution of copper(II) sulfate. (i) Zn + Cu 2+  Zn 2+ + Cu (ii) Describe the change in color of the solution that occurs as the reaction proceeds.  The blue color of the solution due to the presence of the hydrated copper(II) ion fades as the copper(II) ion reacts and the colorless hydrated zinc(II) ion forms.

4. Hexane is combusted in air.  2 C 6 H O 2  12 CO H 2 O (ii) When one molecule of hexane is completely combusted, how many molecules of products are formed?  1 molecule of hexane produces 13 molecules of products

#5 & #6 Short Answer (any topic) [may be lab] [each 7.5% of score]

Grading protocol established & points awarded for each part. Conditional grading is in effect.

Grading Quantitative Problems & Short Answer (each 8-10 pts) Equations (15 pts) Standardized