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Gonzaga High School CHEMISTRY 2202

FINAL EXAMINATION June 2014

Value: 80 Marks Duration: 2 Hours

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 – Selected Response (40 marks) Select the letter of the correct response from those provided. Shade the letter on the Scantron card Do ALL questions in this section.

Part II - Constructed Response (40 marks) Answer ALL questions fully and concisely in the space provided. Show all work and use correct units and significant digits in all final answers.

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!

Chemistry 2202 Final Exam – June 2014 Page 1 Part I Selected Response Total Value: 40 Marks

1. Which isotope has 27 protons and 31 neutrons?

(A) Cobalt-27

(B) Cobalt-58

(D) Gallium-58

2. Which is defined as the amount of carbon atoms in a 12g sample of carbon-12?

(A) Atomic mass

(B) Avogadro’s number

(D) Standard pressure

3. What is the number of hydrogen atoms in 2.3 moles of CH3COOH?

(A) 6.9

(B) 9.2

(D) 5.5 x 1024

4. The imaginary element “vikingium” has two known isotopes, as shown by the data below. What is the average atomic mass of vikingium?

Isotope Percentage Abundance (%) Isotopic Atomic Mass (amu)

vikingium -274 80.00 273.9

vikingium -277 20.00 277.1

(A) 274.9 amu

(B) 276.3 amu

(D) 275.7 amu

5. What is the molar mass of SnCl4●5H2O?

(A) 350.59 g/mol (B) 172.16 g/mol

Chemistry 2202 Final Exam – June 2014 Page 2 6. A 33.55 g sample of a compound with the chemical formula Na2SOx contains 0.2662 mol. What is the identity of the compound?

(A) Na2SO

(B) Na2SO2

(D) Na2SO4 7. What is the number of moles in 27.52 g of PbS?

(A) 8.694 (B) 0.1150 (C) 6.584 X 103 (D) 266.78 8. Which term represents the volume of one mole of gas at STP?

(A) molar mass

(B) molar volume

(D) percent volume

9. What is the percentage of Calcium by mass in Ca(C2H3O2)2?

(A) 3.8%

(B) 25.4%

(D) 40.5%

10. A compound has an empirical formula of C2HCl and a molar mass of 181.44 g/mol. What is the molecular formula of the compound?

(A) C2HCl

(B) C4H2Cl2

(D) C8H4Cl4

11. Which has low solubility in water?

(A) NaCl

(B) KNO3

(D) AgCH3COO

Chemistry 2202 Final Exam – June 2014 Page 3 12. What are the units for molar concentration?

(A) g/L

(B) L

(D) mol/L

13. Which substance, when dissolved in water, is considered to be a non-electrolyte?

(A) NaCl

(B) CuSO4

(D) NH4OH

14. What is the final concentration when 2.0 L of 1.75 mol/L H2SO4(aq) is diluted to a final volume of 6.4 L?

(A) 0.13 mol/L

(B) 0.83 mol/L

(D) 7.5 mol/L

15. The solubility of KCl in water is 295 g/L at 25°C. Which term describes a KCl solution which is 375 g/L at 25°C?

(A) concentrated (B) dilute (C) saturated (D) supersaturated 16. Which term represents the amount of product obtained from a chemical reaction in a lab setting?

(A) actual yield (B) excess reagent (C) limiting reagent (D) theoretical yield

17. For the reaction: 2 K(s) + Cl2(g) → 2 KCl(s)

How many moles of potassium chloride will be produced if 1.54 mol of chlorine gas reacts?

(A) 0.39 mol (B) 0.77 mol (C) 1.54 mol (D) 3.08 mol

Chemistry 2202 Final Exam – June 2014 Page 4 Chemistry 2202 Final Exam – June 2014 Page 5 18. Which is a pipette?

(A)

(B)

(C)

(D)

18. Which is a network covalent solid at room temperature?

(E) CS2 (F) CuZn (G) LiCl

(H) SiO2

Chemistry 2202 Final Exam – June 2014 Page 6 19. How many valence electrons are in an atom of boron, B? (I) 2 (J) 3 (K) 5 (L) 7

20. Which has a double bond?

(M) F2

(N) O2

(O) N2

(P) H2

21. Which Lewis diagram is correct?

(A)

(B)

(C)

(D)

22. What is the shape around an atom with 1 bonding groups and 3 lone pairs? (Q) bent (v-shaped) (R) linear (S) tetrahedral (T) trigonal planar

23. Which contains London dispersion forces only?

(A) CCl4

(B) OCl2

(D) PCl3

Chemistry 2202 Final Exam – June 2014 Page 7 24. Which shape repeats in the structure of diamond shown below?

(U) bent (v-shaped) (V) pyramidal (W) tetrahedral (X) trigonal planar

26. In order of decreasing polarity (most polar to least polar), what is the correct order of these bonds? i) S – H ii) P – H iii) Cl – H

(A) i > ii > iii (B) ii > i > iii (C) iii > i > ii (D) iii > ii > i

18. Which compound contains ionic bonding?

(Y) CCl4 (Z) CsBr

(AA) H2CO (AB) SiC

28. A student has two unknown substances, X and Y. Substance X does not conduct electricity as a solid or a liquid. Substance Y does conduct electricity as a solid and a liquid. What would be the most likely identities of substances X and Y?

X Y (A ) (B)

Chemistry 2202 Final Exam – June 2014 Page 8 Chemistry 2202 Final Exam – June 2014 Page 9 29. Which represents the bonding between aluminum, Al, atoms and bromine, Br, atoms?

(A ) (B)

30. Which compound is polar? (A) cis-1,2-dichloroethene (B)ethene (C)ethyne (D) trans-1,2-dichloroethene

31. The synthesis of which compound led to the modern definition of organic chemistry? (A) DNA (B)urea (C)benzene (D) polyester

32. Which is an aromatic hydrocarbon? (A) alkene (B) benzene (C) ether (D) ketone

33. Which is an alkyne?

(A) C6H6

(B) C6H10

(D) C6H14

34. What is the name of the compound below?

(A) 2-ethyl-6-methylheptane (B) 6-ethyl-2-methylheptane

Chemistry 2202 Final Exam – June 2014 Page 10 (C) 2,6-dimethyloctane (D) 3,7-dimethyloctane

35. Which is a structural isomer of this molecule?

(A)

(B)

(C)

(D)

36. Which reaction represents thermal reforming? (A) (B) (C) (D)

37. Which contains a carboxyl functional group? (A) hexanol (B) hexanone (C) hexanal (D) hexanoic acid

38. What possible product(s) form from the reaction of 1-butanol with ethanoic acid? (A) ethyl butanoate (B) butyl ethanoate (C) butyl ethyl ether (D) ethyl butyl ether

39. Which structure has delocalized electrons?

(A) (B)

(C)

(D)

40. Which reactant could be added to an alkene to produce an alcohol?

(A) H2

(B) H2O

Chemistry 2202 Final Exam – June 2014 Page 11 (C) Br2 (D) HBr

End of Part I

Part II Constructed Response Total Value: 40 Marks

Answer ALL questions in the space provided. Show all workings and report all final answers with correct significant digits and units.

Value 2 41.(a) Calculate the mass of 12.45 L of Argon, Ar(g), at STP.

2 (b) Calculate the percent composition of each element in Rb2SO4.

25. 26.

Chemistry 2202 Final Exam – June 2014 Page 12 3 (c) i) Caffeine has the following percent composition: carbon 49.48%, hydrogen 5.19%, oxygen 16.48% and nitrogen 28.85%. Calculate the empirical formula.

1 ii) If the molar mass of the above compound is 194.19 g/mol, determine the molecular formula.

27. Value 41. (continued)

2 (d) Calculate the volume of a 0.350 mol/L solution that would contain exactly 1.00 g of sodium carbonate, Na2CO3.

(e) A solution of K2SO4 (aq) has a potassium ion concentration of 0.455 mol/L.

i) Write a balanced dissociation equation.

ii) What is the K2SO4(aq) concentration?

3 (f) Given the following balanced equation; what mass of Al2O3(s) must be decomposed to produce 80.0g of oxygen gas?

Chemistry 2202 Final Exam – June 2014 Page 13 2 Al2O3(s) → 4Al(s) + 3O2(g)

28. Value 41. (continued)

3 (g) For the reaction: NaOH(s) + HNO3(aq) → NaNO3(aq) + H2O(l)

5.0 of sodium hydroxide, NaOH(s) is reacted with 50.0 mL of 1.25 mol/L HNO3(aq).

(i) Determine the limiting reagent.

Chemistry 2202 Final Exam – June 2014 Page 14 1 (ii) Calculate the concentration of NaNO3(aq) produced.

29. Value 3 42.(a) Complete the following table for CH3NH2.

Lewis Diagram

VSEPR Shape diagram

Name of shape around each central atom

2 (b) Explain why a molecule of H2O is polar. Justify your answer with a diagram.

Chemistry 2202 Final Exam – June 2014 Page 15 2 (c) Explain, using the appropriate bonding theory, why metals are malleable.

Chemistry 2202 Final Exam – June 2014 Page 16 30. Value 42. (continued)

3 (d) Rank the following substances in order of increasing boiling points. Justify your answer.

NaCl H2O CH4 NH3

5 43.(a) Complete the table with either a structural diagram or IUPAC name.

IUPAC Name Structural Diagram

1,3-diethylcyclopentane

o-dibromobenzene

5-ethyl-2,3-dimethylheptanal

31. Value 43. (continued)

Chemistry 2202 Final Exam – June 2014 Page 17 2 (b) Draw and name two isomers for C3H8O.

Structure 1: Structure 2:

Name: Name:

4 (c) Provide the missing reactant or product for the following three reactions.

Reaction 1

+ +

Reaction 2

+ + HBr

Isomer 1 Isomer 2

Reaction 3

+ F2

End of Exam

Chemistry 2202 Final Exam – June 2014 Page 18