practice final exam 2011

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CHEMISTRY 20

Practice Final EXAM

Some potentially Useless Information

V

SATP

= 24.8 L/mol

K = ºC + 273.15

V

STP

= 22.4 L/mol

Gas constant R= 8.314 (L·kPa)/(mol·K)

1 atm = 760 mmHg = 760 torr = 101.325 kPa = 14.7 psi

STP = 0 ºC and 101.325 kPa

SATP = 25 ºC and 100.000 kPa

Name

Answer all questions on the scantron form.

1. A covalent bond is most likely to form between:

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B. two metallic atoms C. two nonmetallic atoms D. cation and an anion

2. The compound containing bonds involving a nearly equal sharing of

electrons is:

A. NI

3

B. H

2

O

C. HCl

D. B

2

H

6

3. The intermolecular bonding forces in solid CO2 involve:

A. dipole-dipole attractions B. London Forces

C. covalent bonding D. ionic bonding

Use the list of molecules below to answer

the next question

1. CH

3

OH

2. CCl

4

3. NH

3

4. C

2

H

4

5. N

2

6. H

2

O

4. The polar molecules in the list are :

A. 2, 4, 6

B. 1, 2, 4

C. 1, 3, 6

D. 3, 5, 6

5. Which of the following atoms is believed to contain three lone pairs of electrons?

A. Al

B. P

C. S

D. Cl

6. The order of boiling point from highest to lowest will be

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B. CH4, CH3OH, Mg(OH)2

C. Mg(OH)2, CH3OH, CH4

D. CH3OH, Mg(OH)2, CH4

7. Which of the following compounds would exhibit hydrogen bonding?

A. CH3OH

B. HCN C. CH4

D. CH3F

8. The substance that would melt at the highest temperature would be:

A. NH4Cl ammonium chloride

B. C6H6 benzene

C. H2O ice

D. Hg elemental mercury

9. A 10 g sample of carbon monoxide, a poisonous gas produced by incomplete

combustion of hydrocarbons, occupies 15.0 L at a pressure of 200 kPa. The volume

occupied by the carbon monoxide when the pressure is increased to 700 kPa is

A. 1.16 L

B. 4.05 L

C. 4.29 L

D. 52.5 L

10. Carbon dioxide gas is sometimes used to carbonate beverages. A sample of carbon

dioxide occupies a volume of 180 mL at 35.0°C and 88.9 kPa. The volume occupied

by the gas at STP is

A. 140 mL

B. 155 mL

C. 178 mL

D. 181 mL

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A. –196 K

B. 77 K

C. 153 K

D. 273 K

12. At 37°C and 101.0 kPa, a student measured the density of a gaseous hydrocarbon to

be 1.02 g/L. Based on these measurements, the student could conclude that the

hydrocarbon was

A. CH

4

B. C

2

H

2

C. C

2

H

6

D. C

3

H

8

13. What volume of N

2

(g) contains the same number of molecules as a 4.04 g sample of

H

2

(g) if each gas is measured at STP?

a) 24.8 L

b) 22.4 L

c) 11.2 L

d) 44.8 L

14. 28.0g of sodium chloride was dissolved in water to form 50.0mL of solution. After mixing and storing, some solid crystals remained on the bottom of the beaker. The solution is said to be:

A. miscible B. saturated C. diluted

D. supersaturated

15. The equation that represents the dissociation of copper(II) nitrate is:

A. Cu(NO3)2(aq) Cu2+(aq) + 2NO3-(aq

B. CuNO3(aq) Cu+(aq) + NO3-(aq)

C. CuNO3(aq) Cu2+(aq) + NO3-(aq)

D. Cu(NO3)2(aq) 2Cu+(aq) + NO3-(aq)

16. A 0.25 mol/L solution of SrI2 is totally dissociated into Sr2+(aq) ions and I- (aq) ions. The

molar concentration of the iodide ions is:

A. 0.13 mol/L B. 0.25 mol/L C. 0.50 mol/L D. 0.75 mol/L

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A. 23.4 g B. 58.5 g C. 124 g D. 310 g

18. The pH of some tap water was measured to be 8. The hydrogen ion concentration is

A. 10-8_mol/L

B. 108_mol/L

C. 8 x 10-1_mol/L

D. 8 mol/L

19. 300mL of a solution contains 18.3g of CdCl2. The molar concentration of this solution is:

A. 0.0400 mol/L B. 0. 100 mol/L C. 0.00333 mol/L D. 0.333 mol/L

20. A 100mL sample of 0.400 mol/L Cu(NO3)2 solution was diluted to 500mL with water.

The concentration of the resulting solution would be:

A. 0.0200 mol/L B. 0.400 mol/L C. 0.0800 mol/L D 0.0400 mol/L

21. The amount of hydrochloric acid in 15 mL of 6.0mol/L HCl(aq) is

A. 0.40 mmol B. 2.5 mmol C. 3.3 mmol D. 90 mmol

22. Calculate the pOH of 0.075 mol/L strontium hydroxide solution.

A. –0.82

B. 1.12

C. 0.82

D. 0.71

23. A 37.0% (W/V) solution of potassium bromide has a molar concentration of

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B. 3.11 mol/L C. 3.70 mol/L D. 37.0 mol/L

Use the following information to answer the next question

24. The pH of the unidentified solution is approximately

A.

3.0

B.

5.2

C.

6.2

D.

8.0 25. The volume of oxygen needed to burn 12.0 L of propane gas at STP is

A. 60.0 L

B. 2.40 L

C. 2.68 L

D. 12.0 L

26. If a certain mass of Cu(s) completely reacted with 0.350L of 0.750 mol/L AgNO3 solution,

the mass of silver produced is:

A. 56.6 g B. 28.3 g C. 27.3 g D. 26.3 g

Use the following data to answer the next two questions:

Indicator

Colour in Unidentified Solution

orange IV

yellow

methyl red

orange

phenol red

yellow

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A student reacted a 20.0mL sample of barium chloride solution with an excess of 0.200 mol/L H2SO4(aq). A precipitate formed which, when filtered and dried, had a mass of

2.33g

27. The precipitate formed in this reaction was:

A. BaH2

B. BaSO4

C. BaCl2

D. HCl

28. The concentration of the barium chloride solution was:

A. 1.00 mol/L B. 0.499 mol/L C. 0.300 mol/L D. 0.199 mol/L

Use the following graph to answer the next question

29. The graph represents the titration of

A. sodium hydroxide with hydrochloric acid

B. potassium hydroxide with oxalic acid

C. hydrochloric acid with ammonia

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