Chemistry 2202 Practice Exam

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Chemistry 2202
FINAL EXAMINATION June 2010
Value: 100%

General Instructions
This examination consists of two parts. Both parts are contained in this booklet and further general instructions are provided on appropriate pages. Part I – Multiple Choice (40%) Select the letter of the correct response from those provided. EITHER shade the letter on your computer scorable card OR place the letter in the blank provided on your Multiple Choice Answer Sheet, whichever format is being used by your school for this exam. Do ALL questions in this section. Part II – Constructed Response (60%) Answer ALL questions fully and concisely in the space provided.

Student Checklist
The items below are your responsibility. Please ensure that they are completed. Write your name and teacher’s name on the top of this page. Write your name, teacher’s name, course name and number on the Part I answer sheet. Check the exam to see that there are no missing pages. ALL MATERIALS MUST BE PASSED IN WITH THIS EXAM. Use your time wisely. Good luck!

Part I- Multiple Choice Total Value: 40% 1. Carbon-12 and carbon-14 are isotopes of carbon. How are these isotopes different? (A) (B) (C) (D) number of electrons number of neutrons number of photons number of protons

2.

How many atoms are in 1.00 mol of beryllium? (A) (B) (C) (D) 9.01 22.4 6.02 x 1023 1.20 x 1047

3.

Which isotope has 52 protons and 75 neutrons? (A) (B) (C) (D) Rhenium - 75 Rhenium - 127 Tellurium - 52 Tellurium - 127

4.

What is the molar mass of Al2(SO4)3? (A) (B) (C) (D) 214.17 g/mol 278.03 g/mol 342.17 g/mol 450.09 g/mol

5.

What is the percent composition of water in Plaster of Paris, (CaSO4)2 • H2O? (A) (B) (C) (D) 6.207% 13.81% 33.09% 93.79% Page 1

Chemistry 2202 June 2010

6.

Gas filled glass tubes are used as lighted store signs. A purple sign contains 19% argon, 3% helium, 21% neon, and 57% xenon. Which gas is the solvent? (A) (B) (C) (D) argon helium neon xenon

7.

Which is the most concentrated solution? (A) (B) (C) (D) 1.23 mol/L 5.83 mol/L 7.60 mol/L 8.00 mol/L

8.

Which has high solubility in water? (A) (B) (C) (D) AgBr AgNO3 Ag2S Ag2SO4

9.

Which defines an electrolytic solution? (A) (B) (C) (D) bright colored conducts electricity conducts heat contains excess solute

10.

A 500.0 mL container of homogenized milk is 3.50% (m/v) fat. How much fat is in this container of milk? (A) (B) (C) (D) 1.75 g 17.5 g 1.43 x 102 g 1.43 x 104 g

Chemistry 2202 June 2010

Page 2

11.

Sodium chloride, NaCl(s), crystals are added to an existing sodium chloride solution. The crystals settle at the bottom of the container without undergoing a change in mass. Which describes the original solution? (A) (B) (C) (D) monounsaturated saturated supersaturated unsaturated

12.

A lab technician prepares a dilute solution of hydrochloric acid. If 50.0 mL of 2.50 mol/L hydrochloric acid is added to 450.0 mL of water, what is the new concentration? (A) (B) (C) (D) 0.250 mol/L 0.278 mol/L 3.60 mol/L 4.00 mol/L

13.

What is the correct dissociation equation for iron (III) sulfate? (A) (B) (C) (D) Fe2(SO4)3 (s) Fe2(SO4)3 (s) Fe2(SO4)3 (s)

Fe3+ (aq) Fe3+ (aq) 2 Fe3+ (aq) 3 Fe2+ (aq)

+ SO42- (aq) + SO42- (aq)

+ 3 SO42- (aq) + 3 SO42- (aq)

Fe2(SO4)3 (s)

14.

If 6.76 mol of Fe(s) reacts with excess O2(g), how many moles of solid product should be formed? 4 Fe (s) + 3 O2 (g) (A) (B) (C) (D) 3.38 mol 5.07 mol 9.01 mol 13.5 mol 2 Fe2O3 (s)

15.

What volume does 22.2 g of chlorine gas, Cl2 (g), occupy at STP? (A) (B) (C) (D) 7.01 L 14.0 L 35.8 L 71.8 L Page 3

Chemistry 2202 June 2010

16.

A chemist completes a chemical reaction in the laboratory; 2.34 g of product are recovered. What does this mass represent? (A) (B) (C) (D) actual yield percent...
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