Chem 13732 | Course Paper

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If 77.5 g of ethylene glycol (HOCH2CH2OH) is added to 422.5 g of water, what is the

mole fraction of ethylene glycol?

A.0.00296

B.0.0506

C.0.183

D.0.949

E.2.96

The reaction of elemental chlorine with potassium iodide yields elemental iodine and

potassium chloride. Write a balanced chemical equation for this reaction.

A.Cl2(g) + KI(s) I(s) + KCl2(s)

B.Cl2(g) + 2 KI(s) I2(s) + 2 KCl(s)

C.Cl2(g) + KI2(s) I2(s) + KCl2(s)

D.Cl(g) + KI(s) I(s) + KCl(s)

E.Cl2(g) + 2 K2I(s) I2(s) + 2 K2Cl(s)

What is the molar solubility of Fe(OH)3(s) in a solution that is buffered at pH 2.50 at 25

C? The Ksp of Fe(OH)3 is 6.3 10“38 at 25 C.

A.6.9 10“28 mol/L

B.2.0 10“26 mol/L

C.1.3 10“13 mol/L

D.2.0 10“3 mol/L

E.5.0 102 mol/L

All of the following statements concerning crystal field theory are true EXCEPT

A.in low-spin complexes, electrons are concentrated in the dxy, dyz, and dxz orbitals.

B.in an isolated atom or ion, the five d orbitals have identical energy.

C.low-spin complexes contain the maximum number of unpaired electrons.

D.the crystal field splitting is larger in low-spin complexes than high-spin complexes.

E.the energy difference between d orbitals often corresponds to an energy of visible

light.

Which of the following diagrams represent d-orbitals?

A.1 only

B.2 only

C.3 only

D.4 only

E.1 and 4

What is the OH“ concentration of an aqueous solution with a pH of 9.83? (Kw = 1.01

10“14)

A.1.3 10“10 M

B.6.8 10“5 M

C.6.8 10“1 M

D.1.5 10“2 M

E.7.4 109 M

What type of orbital is designated n = 3, = 0, = 0?

A.3s

B.3p

C.3d

D.3f

E.none

What is the pH of a buffer that results when 0.50 mole of H3PO4 is mixed with 0.75

mole of NaOH and diluted with water to 1.00 L? (The acid dissociation constants of

phosphoric acid are Ka1 = 7.5 10“3, Ka2 = 6.2 10“8, and Ka3 = 3.6 10“13)

A.1.82

B.2.12

C.6.91

D.7.21

E.12.44

Write a balanced net ionic equation for the overall reaction represented by the cell

notation below.

Ag(s) | AgI(s) | I“(aq) || Fe2+(aq), Fe3+(aq) | Pt

A.Fe3+(aq) + Ag(s) + I“(aq) Fe2+(aq) + AgI(s)

B.Fe2+(aq) + Ag(s) + I“(aq) Fe3+(aq) + AgI(s)

C.Fe3+(aq) + AgI(s) Fe2+(aq) + Ag(s) + I“(aq)

D.Fe2+(aq) + AgI(s) Fe3+(aq) + Ag(s) + I“(aq)

E.Fe3+(aq) + 2 I“(aq) Fe2+(aq) + I2(s)

Nitric oxide is made from the oxidation of ammonia. What mass of nitric oxide can be

made from the reaction of 8.00 g NH3 with 17.0 g O2?

4 NH3(g) + 5 O2(g) 4 NO(g) + 6 H2O(g)

A.4.54 g

B.12.8 g

C.14.1 g

D.15.9 g

E.25.0 g

A cylinder has a radius of 2.38 mm and a height of 175 mm. Calculate the volume of

the cylinder in liters. (Volume = pr2h)

A.3.11 10“3 L

B.3.11 10“2 L

C.0.311 L

D.3.11 L

E.3.11 103 L

Calculate the cell potential, at 25 C, based upon the overall reaction

Zn2+(aq) + 2 Fe2+(aq) Zn(s) + 2 Fe3+(aq)

if [Zn2+] = 1.50 10-4 M, [Fe3+] = 0.0200 M, and [Fe2+] = 0.0100 M. The standard

reduction potentials are as follows:

Zn2+(aq) + 2 e“ Zn(s) E = “0.763 V

Fe3+(aq) + e“ Fe2+(aq) E = +0.771 V

A.”1.665 V

B.”1.534 V

C.”1.439 V

D.”0.008 V

E.+0.008 V

At 338 mm Hg and 72 C, a sample of carbon monoxide gas occupies a volume of 0.225

L. The gas is transferred to a 1.50-L flask and the temperature is reduced to “15 C.

What is the pressure of the gas in the flask?

A.8.91 mm Hg

B.37.9 mm Hg

C.67.8 mm Hg

D.3.018 103 mm Hg

E.5.48 104 mm Hg

Which of the following liquids will be miscible with water in any proportions: ethanol

(CH3CH2OH), carbon tetrachloride (CCl4), hexane (C6H14), and/or formic acid

(HCO2H)?

A.ethanol and carbon tetrachloride

B.carbon tetrachloride and hexane

C.ethanol and formic acid

D.ethanol, carbon tetrachloride, and benzene

E.carbon tetrachloride, and formic acid

Consider the reaction A(aq) 2 B(aq) where Kc = 4.1 at 25 C. If 0.50 M A(aq) and 1.5

M B(aq) are initially present in a 1.0 L flask at 25 C, what change in concentrations (if

any) will occur in time?

A.[A] will decrease and [B] will decrease.

B.[A] will decrease and [B] will increase.

C.[A] will increase and [B] will decrease.

D.[A] will increase and [B] will increase.

E.[A] and [B] remain unchanged.

Write a balanced chemical equation which corresponds to the following equilibrium

constant expression.

A.PbF2(aq) Pb(s) + F2(aq)

B.PbF2(s) Pb2+(aq) + 2 F“(aq)

C.Pb2+(aq) + 2 F“(aq) PbF2(s)

D.Pb(s) + F2(aq) PbF2(aq)

E.PbF+(aq) + F“(aq) PbF2(aq)

Calculate DrG for the reaction below at 25.0 C

2 Na(s) + 2 H2O( ) 2 NaOH(aq) + H2(g)

given DrH = -366.6 kJ/mol-rxn and DrS = -154.2 J/Kmol-rxn.

A.”371.2 kJ/mol-rxn

B.”320.6 kJ/mol-rxn

C.”215.4 kJ/mol-rxn

D.+371.2 kJ/mol-rxn

E.+4634.9 kJ/mol-rxn

What process occurs when the temperature of a substance is at Point A increased (at

constant pressure) until the substance is at Point B?

A.condensation

B.vaporization

C.sublimation

D.melting

E.freezing

Given the following standard reduction potentials,

Pb2+(aq) + 2 e“ Pb(s) E = “0.126 V

PbSO4(s) + 2 e“ Pb(s) + SO4

2″(aq) E = “0.355 V

determine Ksp for PbSO4(s) at 25 C.

A.3.4 10“28

B.1.8 10“8

C.5.6 10“5

D.5.6 107

E.2.9 1037

A precipitate will form when aqueous nickel(II) chloride is added to an aqueous

solution of ____.

A.SrI2

B.Cu(NO3)2

C.KOH

D.Na2SO4

E.NaBr

Calculate DrG for the disproportionation reaction of Cu+ at 25 C,

2 Cu+(aq) Cu2+(aq) + Cu(s)

given the following thermodynamic information.

Cu+(aq) + e“ Cu(s) E = +0.518 V

Cu2+(aq) + 2 e“ Cu(s) E = +0.337 V

A.”165 kJ/molrxn

B.”135 kJ/molrxn

C.”34.9 kJ/molrxn

D.+17.5 kJ/molrxn

E.+135 kJ/molrxn

What is the frequency of gamma ray radiation that has a wavelength of 11.4 pm?

A.3.80 10“20 s“1

B.1.74 10“14 s“1

C.2.63 107 s“1

D.3.42 109 s“1

E.2.63 1019 s“1

The white in most white paints comes from ________.

A.TiO2

B.CdS

C.Fe4[Fe(CN)6]3 14 H2O

D.KMnO4

E.AgI

What is the equilibrium constant for the reaction below at 25 C? (R = 8.314 J/Kmol)

MgCO3(s) MgO(s) + CO2(g)

given DfG [MgCO3(s)] = “1028.2 kJ/mol, DfG [MgO(s)] = “568.8 kJ/mol, and DfG

[CO2(g)] = “394.4 kJ/mol.

A.4.0 10“12

B.0.97

C.1.0

D.1.0 104

E.2.5 1011

Diluting concentrated sulfuric acid with water can be dangerous. The temperature of the

solution can increase rapidly. What are the signs of DrH, DrS, and DrG for this process?

A.DrH < 0, DrS > 0, DrG < 0

B.DrH < 0, DrS < 0, DrG < 0

C.DrH < 0, DrS > 0, DrG > 0

D.DrH > 0, DrS > 0, DrG < 0

E.DrH > 0, DrS < 0, DrG > 0

What concentration unit is used in the calculation of osmotic pressure for a dilute

solution?

A.molality

B.weight percent

C.mass fraction

D.mole fraction

E.molarity

The following anions can be separated by precipitation as silver salts: Cl“, Br“, I“,

CrO4

2″. If Ag+ is added to a solution containing the four anions, each at a concentration

of 0.10 M, in what order will they precipitate?

Compound Ksp

AgCl 1.8 10“10

Ag2CrO4 1.1 10“12

AgBr 5.4 10“13

AgI 8.5 10“17

A.AgCl Ag2CrO4 AgBr AgI

B.AgI AgBr Ag2CrO4 AgCl

C.Ag2CrO4 AgCl AgBr AgI

D.Ag2CrO4 AgI AgBr AgCl

E.AgI AgBr AgCl Ag2CrO4

Which of the following chemical equations shows the formation of synthesis gas?

A.2 H2O(g) 2 H2(g) + O2(g)

B.16 CH4(g) + 7 O2(g) 2 C8H18(g) + 14 H2O(g)

C.C(s) + 2 H2(g) CH4(g)

D.CO(g) + H2O(g) CO2(g) + H2(g)

E.C(s) + H2O(g) H2(g) + CO(g)

Dinitrogen monoxide, or laughing gas, can be made by decomposing ammonium nitrate

at 250 C. Write a balanced equation for this reaction.

A.NH4NO3(s) N2O(g) + 2 H2(g) + O2(g)

B.NH4NO3(s) + 2 N2(g) 3 N2O(g) + 2 H2(g)

C.NH4NO3(s) N2O(g) + 2 H2O(g)

D.2 NH4NO3(s) N2O(g) + 2 HNO2(g) + H2O(g) + 2 H2(g)

E.3 NH4NO3(s) N2O(g) + 2 N2(g) + 8 H2O(g)

Calculate the energy in the form of heat (in kJ) required to change 75.0 g of liquid water

at 27.0 C to ice at “20.0 C. Assume that no energy in the form of heat is transferred to

the environment. (Heat of fusion = 333 J/g; heat of vaporization = 2256 J/g; specific

heat capacities: ice = 2.06 J/gK, liquid water = 4.184 J/gK)

A.”13.4 kJ

B.”17.7 kJ

C.”36.5 kJ

D.”10.2 kJ

E.”30.3 kJ

What is the identity of?

A.Ni

B.Zn

C.Rn

D.Ce

E.Pd

What is the molecular geometry around a central atom that is sp3d2 hybridized and has

two lone pairs of electrons?

A.tetrahedral

B.trigonal-bipyramidal

C.square-planar

D.square-pyramidal

E.see-saw

Which of the following statements concerning hydrocarbons is/are CORRECT?

1/ Coal is a source of many aromatic hydrocarbons.

2/ Petroleum is subjected to a process known as cracking, where aromatic rings are

cracked open to yield alkane chains.

3/ The primary components of petroleum (prior to refining) are alkenes and alkynes.

A.1 only

B.2 only

C.3 only

D.1 and 3

E.1, 2, and 3

Naphthalene, a hydrocarbon, has an approximate molar mass of 128 g/mole. If the

combustion of 0.6400 g naphthalene produces 0.3599 g H2O and 2.1977 g CO2, what is

the molecular formula of this compound?

A.C8H32

B.C9H18

C.C9H20

D.C10H8

E.C11H7