AP CHEMISTRY EXAM QUESTIONS 2

AP CHEMISTRY EXAM QUESTIONS 2

• Pure acetic acid (HC2H3O2) is a liquid and is known as glacial acetic acid. Calculate the molarity of a solution prepared by dissolving 10.00 mL of glacial acetic acid at 25°C in sufficient water to give 500.0 mL of solution. The density of glacial acetic acid at 25°C is 1.05 g/mL.

• 1.26 × 103
• 21.0
• 0.0210
• 0.350

e. 3.50 × 10-4: 0.350

• The value of ”H° for the reaction below is -790 kJ. The enthalpy change accompanying the reaction of 0.95 g of S is kJ.

2S (s) + 3O2 (g) ’ 2SO3 (g)

• 23
• -23
• -12
• 12

e. -790: -12

• N2 (g) + O2 (g) ’ 2NO (g)”H = +180.7 kJ

2NO (g) + O2 (g) ’ 2NO2 (g)”H = -113.1 kJ

the enthalpy of reaction for 4NO (g) ’ 2NO2 (g) + N2 (g) is kJ. a. 67.6

• 45.5
• -293.8
• -45.5

e. 293.8: -293.8

• The average fuel value of sugars is 17 kJ/g. A 2.0 L pitcher of sweetened Kool-Aid contains 400 g of sugar. What is the fuel value (in kJ) of a 500 mL serving of Kool-Aid?(Assume that the sugar is the only fuel source.)

• 4.2 × 10^4
• 1.7 × 10^3 1 / 2

• 1.7 × 10^6
• 1.7 × 10^2

e. 17: 1.7 × 10^3

• A weak electrolyte exists predominantly as in solution.:

Molecules

• What are the spectator ions in the reaction between KOH (aq) and HNO3 (aq)?: K+ and NO3-

• The spectator ions in the reaction between aqueous hydrochloric acid and aqueous ammonia

are .: Cl- only

• How many moles of Co2+ are present in 0.200 L of a 0.400 M solution of CoI2?: 0.0800

• Calculate the concentration (M) of sodium ions in a solution made by diluting 50.0 mL of

a 0.874 M solution of sodium sulfide to a total volume of 250.0 mL.: 0.350

• The molarity of an aqueous solution containing 75.3 g of glucose (C6H12O6) in 35.5 mL of

solution is .: 11.8

• With which of the following will the ammonium ion form an insoluble salt?

• chloride
• sulfate
• carbonate
• sulfate and carbonate

e. none of the above: none of the above

• With which of the following will the potassium ion form an insoluble salt?

• chloride
• sulfate
• carbonate
• sulfate and carbonate

e. none of the above: none of the above

• You are given two clear solutions of the same unknown monoprotic acid, but with different concentrations. Which statement is true?

• There is no chemical method designed to tell the two solutions apart.
• It would take more base solution (per milliliter of the unknown solution) to neutralize the

more concentrated solution.

• A smaller volume of the less concentrated solution contains the same number of moles of

the acid compared to the more concentrated solution.

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