Chem 77701 | Course Paper

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What is the name of the following compound?

A.3,4-diethyl-5-methylheptane

B.3,4,5-heptane

C.3-ethyl-5-(2-butyl)hexane

D.3-(2-butyl)-3-ethylhexane

E.3,5,6-trimethylheptane

For which of the following transitions would a hydrogen atom absorb a photon with the

longest wavelength?

A.n = 1 to n = 2

B.n = 4 to n = 6

C.n = 5 to n = 4

D.n = 7 to n = 6

E.n = 6 to n = 7

Water can be decomposed by electrolysis into hydrogen gas and oxygen gas. What mass

of water must decompose to fill a 3.00 L flask to a total pressure of 2.00 atm at 298 K

with a mixture hydrogen and oxygen? (R = 0.08206 Latm/molK)

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

A.1.47 g

B.2.95 g

C.4.42 g

D.6.63 g

E.8.84 g

A tightly sealed 4.0-L flask contains 884 mm Hg of N2 at 94.0 C. The flask is cooled

until the pressure is reduced 442 mm Hg. What is the temperature of the gas?

A.”47.0 C

B.47.0 C

C.”89.5 C

D.184 C

E.188 C

Hydrogen peroxide decomposes into water and oxygen in a first-order process.

H2O2(aq) H2O( ) + 1/2 O2(g)

At 20.0 C, the half-life for the reaction is 3.92 104 seconds. If the initial concentration

of hydrogen peroxide is 0.52 M, what is the concentration after 7.00 days?

A.1.2 10-5 M

B.0.034 M

C.0.074 M

D.0.22 M

E.0.52 M

Lattice enthalpy may be calculated using the thermodynamic relationship known as

A.the Clausius-Clapeyron equation.

B.the Born-Haber cycle.

C.the dynamic equilibrium expression.

D.Avogadro’s hypothesis.

E.cubic cell enthalpy of formation equation.

Formulas for derivatives of hydrocarbons may be written as R-X, where R is a

hydrocarbon lacking a hydrogen atom and X is a functional group. Which of the

following formulas represents an ester?

A.ROH

B.ROR’

C.RCOR’

D.RCO2R’

E.RCHO

What is the name of the following benzene derivative?

A.1-chlorobenzoic acid

B.5-chloroanaline

C.1-acetate-1-chlorobenzene

D.5-chlorobenzoic acid

E.1,3-chlorocarboxylic benzene

Hydrazine, N2H4, is a liquid used as a rocket fuel. It reacts with oxygen to yield

nitrogen gas and water.

N2H4( ) + O2(g) N2(g) + 2 H2O( )

The reaction of 6.50 g N2H4 evolves 126.2 kJ of heat. Calculate the enthalpy change

per mole of hydrazine combusted.

A.”19.4 kJ/mol

B.”25.6 kJ/mol

C.”126 kJ/mol

D.”622 kJ/mol

E.”820. kJ/mol

What is the product of the reduction of butanone?

A.1-butene

B.2-butanol

C.cis-2-butene

D.acetone

E.butanoic acid

Given the following two half-reactions, write the overall reaction in the direction in

which it is spontaneous and calculate the standard cell potential.

Pb2+(aq) + 2 e“ Pb(s) E = “0.126 V

Fe3+(aq) + e“ Fe2+(s) E = +0.771 V

A.Pb2+(aq) + 2 Fe2+(s) Pb(s) + 2 Fe3+(aq) = +0.897 V

B.Pb2+(aq) + Fe2+(s) Pb(s) + Fe3+(aq) = +0.645 V

C.Pb(s) + 2 Fe3+(aq) Pb2+(aq) + 2 Fe2+(s) = +1.416 V

D.Pb(s) + 2 Fe3+(aq) Pb2+(aq) + 2 Fe2+(s) = +0.897 V

E.Pb(s) + Fe3+(aq) Pb2+(aq) + Fe2+(s) = +0.645 V

The concentration of Pb2+ in an aqueous solution is 5.5 10“3 M. What concentration of

SO4

2″ is required to begin precipitating PbSO4? The Ksp of PbSO4 is 2.5 10“8.

A.1.4 10“10 M

B.4.5 10“6 M

C.1.6 10“4 M

D.8.3 10“4 M

E.2.9 10“2 M

A mixture of MnSO4 and MnSO44H2O has a mass of 2.005 g. After heating to drive off

all the water the mass is 1.780 g. What is the mass percent of MnSO44H2O in the

mixture?

A.11.2%

B.34.7%

C.65.3%

D.69.6%

E.88.8%

How many geometric isomers may exist for the square-planar complex ion

[Pt(OH)2(NH3)2]2″?

A.2

B.3

C.4

D.5

E.6

What is the coordination number of the central metal ion in [Ni(NH3)4(H2O)2]Cl2?

A.0

B.2

C.4

D.6

E.8

In general, atomic radii

A.decrease down a group and remain constant across a period.

B.decrease down a group and increase across a period.

C.increase down a group and increase across a period.

D.increase down a group and remain constant across a period.

E.increase down a group and decrease across a period.

A mixture of H2 and O2 is placed in a 5.00 L flask at 22 C. The partial pressure of the

H2 is 2.7 atm and the partial pressure of the O2 is 1.5 atm. What is the mole fraction of

H2?

A.0.13

B.0.36

C.0.56

D.0.64

E.0.87

Which list contains the three most abundant elements in the Earth’s crust?

A.hydrogen, helium, and lithium

B.sodium, calcium, and iron

C.oxygen, nitrogen, and iron

D.carbon, nitrogen, and oxygen

E.oxygen, aluminum, and silicon

Place the following ions in order from smallest to largest ionic radii: K+, Na+, Mg2+,

and Al3+.

A.Al3+ < Mg2+ < Na+ < K+

B.Na+ < Mg2+ < Al3+ < K+

C.K+ < Mg2+ < Na+ < Al3+

D.K+ < Al3+ < Mg2+ < Na+

E.Mg2+ < Al3+ < Na+ < K+

What is the molar solubility of BaF2 in 0.033 M KF(aq) at 25 C? The value of Ksp of

BaF2 is 1.8 10“7 at 25 C.

A.2.7 10“6 mol/L

B.5.5 10“6 mol/L

C.4.1 10“5 mol/L

D.1.1 10“4 mol/L

E.1.7 10“4 mol/L

Which elements have no affinity for electrons?

A.transition metals

B.s-block elements

C.main group nonmetals

D.noble gases

E.semiconductors

How many lone pair of electrons are assigned to the fluorine atom in HF?

A.0

B.1

C.2

D.3

E.4

Which of the following molecules or ions does not have one or more resonance

structures?

A.O3

B.OCN“

C.SO2

D.H2CO

E.NO3

“

Which of the following statements is/are CORRECT?

1/ All ionic compounds that are soluble in water are electrolytes.

2/ All ionic compounds dissolve in water.

3/ Molecular compounds are never soluble in water.

A.1 only

B.2 only

C.3 only

D.1 and 2

E.2 and 3

Which of the following chemical equations corresponds to the base ionization constant,

Kb, for hydrogen sulfite ion (HSO3

“)?

A.HSO3

“(aq) + H2SO3(aq) 2 H2SO3(aq)

B.HSO3

“(aq) + H2O( ) SO3

2″(aq) + H3O+(aq)

C.HSO3

“(aq) + OH“(aq) SO3

2″(aq) + H2O( )

D.HSO3

“(aq) + H3O+(aq) H2SO3(aq) + H2O( )

E.HSO3

“(aq) + H2O( ) H2SO3(aq) + OH“(aq)

Which ionic compound forms a pH-neutral aqueous solution at 25 C?

A.NaHCO3

B.LiClO4

C.LiF

D.NH4Cl

E.K2S

Hydrogen peroxide decomposes into oxygen and water. What mass of oxygen is formed

from the decomposition of 125 g of H2O2?

A.58.8 g

B.66.4 g

C.107 g

D.118 g

E.125 g

Place the following molecules in order from smallest to largest H-N-H bond angles:

NH4

+, NH3, and NH2

“.

A.NH4

+ < NH3 < NH2

“

B.NH4

+ < NH2

“ < NH3

C.NH2

“ < NH3 < NH4

D.NH2

“ < NH4

+ < NH3

E.NH3 < NH2

“ < NH4

What is the root-mean-square velocity of carbon dioxide molecules at 55 C?

A.13.6 m/s

B.42.8 m/s

C.177 m/s

D.186 m/s

E.431 m/s

What is the definition of molality?

A.moles of solute per kg of solvent

B.grams of solute per kg of solution

C.grams of solute per liter of solution

D.moles of solute per liter of solvent

E.moles of solute per liter of solution