THE AP Chemistry

Exam

Two Sections1. Multiple Choice2. Free Response

185 minutes total

Section I75 Multiple Choice Questions

(50% of score)Periodic Table only

NO calculator90 minutes

Grading

wrong#4

1-right# score MC

Section II:Free Response (50% of score)Periodic Table

Equations SheetReduction Potential Table

Section II:Free Response

Part AQuantitative SectionCAN USE calculator

55 minutes

A graphing or scientific calculator is permitted.

ExcludesPower Books

PDAQWERTY keypad

w/paper tapesmodels that talk

require outletcell phone

#1Quantitative Problem

(Equilibrium)[10% of score]

#2 & #3Quantitative Problems

(any topic)[may be lab]

[each 10% of score]

Section IIFree Response

Part BEquations & Short Answer

NO calculator40 minutes

#4Three (3) Equations

BalanceAnswer short question

(answer in box)[5% of score]

Question 4—Reactions

3 reactions1 point for reactants2 points for products1 point for balance1 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 2+ + 2 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 KClO3 2 KCl + 3 O2

(ii) What is the oxidation number of chlorine before and after the reaction?

Chlorine has an oxidation number of +5 in KClO3 and -1 in KCl

4. A solution of ethanoic (acetic) acid is added to a solution of barium hydroxide.

i. HC2H3O2 + OH- H2O + C2H3O2-

(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 C2H3O2

- .

4. 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.

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 C6H14 + 19 O2 12 CO2 + 14 H2O

(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 & #6Short 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