Chem 64219 | Course Paper

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Butane, C4H10, reacts with excess oxygen to produce carbon dioxide gas and water.

What volume of CO2, measured at 25.0 C and 0.922 atm is produced from the reaction

of 14.0 g C4H10 with excess oxygen? (R = 0.08206 Latm/molK)

A.2.04 L

B.3.72 L

C.6.39 L

D.8.15 L

E.25.6 L

For which of the following atoms is the 2+ ion diamagnetic in the ground state?

A.Ni

B.Fe

C.Zn

D.Mn

E.Cu

Write a balanced equation for the reaction that occurs when hydrogen sulfate ion

behaves as a Brnsted-Lowry acid in water.

A.HSO4

“(aq) + H2O( ) H2SO4(aq) + H3O+(aq)

B.SO4

2″(aq) + H2O( ) HSO4

“(aq) + OH“(aq)

C.HSO4

“(aq) + H2O( ) SO4

2″(aq) + H3O+(aq)

D.HSO4

“(aq) + H2O( ) H2SO4(aq) + OH“(aq)

E.H2SO4(aq) + H2O( ) HSO4

“(aq) + H3O+(aq)

A mass of 4.561 g of a metal carbonate, MCO3, is heated to drive off carbon dioxide.

The remaining metal oxide has a mass of 3.544 g.

MCO3(s) MO(s) + CO2(g)

What is the identity of the metal?

A.Ni

B.Ba

C.Ca

D.Co

E.Mg

Cesium bromide crystallizes in a primitive cubic unit cell with bromide ions at the

lattice points. The cesium ions occupy cubic holes. How many bromide ions surround

each cesium ion in cesium bromide?

A.1

B.2

C.4

D.8

E.12

The spectrochemical series

A.lists ligands in order from monodentate to hexadentate.

B.lists ligands in the order of their electronegativity.

C.lists coordination compounds in order of their color.

D.lists complex ions in order of their color.

E.lists ligands in order of their tendency to split d orbitals.

Which of the following chemical equations is an acid-base reaction?

A.Ba(OH)2(aq) + K2SO4(aq) BaSO4(s) + 2 KOH(aq)

B.3 NaOH(aq) + AlCl3(aq) Al(OH)3(s) + 3 NaCl(aq)

C.2 H+(aq) + Zn(s) H2(g) + Zn2+(aq)

D.2 HCl(aq) + Pb(NO3)2(aq) PbCl2(s) + 2 HNO3(aq)

E.H3PO4(aq) + NH3(aq) NH4

+(aq) + H2PO4

–(aq)

Nitrogen and oxygen gases may react to form nitrogen monoxide. At 1500 C, Kc equals

1.0 10-5.

N2(g) + O2(g) 2 NO(g)

If 0.030 mol N2 and 0.030 mol O2 are sealed in a 1.0 L flask at 1500 C, what is the

concentration of NO(g) when equilibrium is established?

A.3.0 10-7 M

B.4.7 10-5 M

C.9.5 10-5 M

D.3.0 10-2 M

E.9.1 101 M

Which group of the periodic table of elements forms only 2+ ions?

A.group 1A

B.group 2A

C.group 1B

D.group 7A

E.group 8A

Which of the following ions have an [Ar]3d5 electron configuration: Co2+, Mn2+, and

Fe3+?

A.Co2+ only

B.Mn2+ only

C.Fe3+ only

D.Co2+ and Fe3+

E.Mn2+ and Fe3+

Which one of the following hydrocarbons has cis and trans isomers?

A.hexane

B.1-pentene

C.2-methylpropane

D.2-ethylbutane

E.2-pentene

One resonance structure for OCN“ ion is drawn below. What is the formal charge on

each atom?

A.Cl atom = 0 and each O atom = 0

B.Cl atom = 0 and each O atom = “1

C.Cl atom = “1 and each O atom = 0

D.Cl atom = +1 and each O atom = “1

E.Cl atom = 0, one O atom = 0, one O atom = “1

Place the following cations in order from lowest to highest hydration enthalpy: H+, K+,

and Cs+.

A.K+ < Cs+ < H+

B.Cs+ < H+ < K+

C.Cs+ < K+ < H+

D.H+ < K+ < Cs+

E.H+ < K+ < Na+

Clouds and fog are colloidal dispersions that contain a liquid dispersed in a gaseous

medium. This type of colloid is called a(n) ____.

A.emulsion

B.aerosol

C.foam

D.sol

E.gel

Use VESPR theory to predict the molecular geometry around the carbon atom in

formaldehyde, H2CO.

A.linear

B.bent

C.trigonal-planar

D.tetrahedral

E.octahedral

Which of the following weak acids has the strongest conjugate base in an aqueous

solution?

A.formic acid (HCO2H), Ka = 1.8 10“4

B.hypobromous (HOBr), Ka = 2.5 10“9

C.hydrogen sulfite ion (HSO3

“), Ka = 6.2 10“8

D.nitrous acid (HNO2), Ka = 4.5 10“4

E.phosphoric acid (H3PO4), Ka = 7.5 10“3

Which of the structures below has the common name o-dichlorobenzene (where o– is

ortho)?

The volume of space occupied by a beryllium atom is 6.0 10“30 m3. What is this volume

in units of nm3?

A.6.0 10“57 nm

B.6.0 10“21 nm

C.6.0 10“12 nm

D.6.0 10“3 nm

E.6.0 106 nm

What is the balanced equation for carbonate ion (CO3

2″) acting as a Brnsted base in a

reaction with water?

A.CO3

2″(aq) + 3 H2O( ) CO4

4″(aq) + 2 H3O+(aq)

B.CO3

2″(aq) + H2O( ) HCO3

“(aq) + OH“(aq)

C.CO3

2″(aq) + H2O( ) CO2(g) + 2 OH“(aq)

D.CO3

2″(aq) + 2 H2O( ) HCO3

“(aq) + H3O+(aq)

E.CO3

2″(aq) + H2O( ) H2CO4

2″(aq)

Which of the following statements concerning neutron activation analysis is/are

CORRECT?

1/ In neutron activation analysis, a neutron is ejected from an atom creating a new

isotope that is one mass unit lower.

2/ Neutron activation analysis is destructive, but requires less than 1 g of sample.

3/ Neutron activation analysis creates isotopes in the excited state that emit gamma rays

to return to the ground state.

A.1 only

B.2 only

C.3 only

D.2 and 3

E.1, 2, and 3

The freezing point depression constant of water is “1.86 C/m. If 7.50 g NaCl is

dissolved in 45.0 g H2O, the freezing point is changed by “9.71 C. Calculate the van’t

Hoff factor for NaCl.

A.1.00

B.1.54

C.1.67

D.1.83

E.1.91

Which of the following chemical equations corresponds to Kb1 for SO3

2″?

A.HSO3

“(aq) + H2O( ) H2SO3(aq) + OH“(aq)

B.SO3

2″(aq) + H3O+(aq) HSO3

“(aq) + H2O( )

C.H2SO3(aq) + OH“(aq) HSO3

“(aq) + H2O( )

D.HSO3

“(aq) + OH“(aq) SO3

2″(aq) + H2O( )

E.SO3

2″(aq) + H2O( ) HSO3

“(aq) + OH“(aq)

All of the following sets of quantum numbers are allowed EXCEPT

A.n = 1, = 0, = 0

B.n = 2, = 2, = +1

C.n = 3, = 1, = “1

D.n = 4, = 1, = 0

E.n = 5, = 4, = “3

What is the name of the following benzene derivative?

A.dibenzene

B.1,2-dibenzene

C.toluene

D.naphthalene

E.aniline

Molten Al2O3 is reduced by electrolysis at low potentials and high currents. If 7.5 103

amperes of current is passed through molten Al2O3 for 12.0 hours, what mass of Al is

produced? Assume 100% current efficiency.

A.5.0 102 g

B.3.0 104 g

C.9.1 104 g

D.2.7 105 g

E.3.1 106 g

Diagram 9-1

The molecular orbital diagram below may be used for the following problem(s). For

oxygen and fluorine, the s2p orbital should be lower in energy than the p2p. However,

the diagram will still yield correct bond order and magnetic behavior for these

molecules.

Energy ________ s*2p

________ ________ p*2p

________ s2p

________ ________ p2p

________ s*2s

________ s2s

________ s*1s

________ s1s

Refer to Diagram 9-1. According to molecular orbital theory, what is the bond order of

oxygen, N2

2″?

A.1

B.3/2

C.2

D.5/2

E.3

What is the mole fraction of water in a solution that is 33.3% by weight ethylene

glycol? The molar mass of ethylene glycol, HOCH2CH2OH, is 62.07 g/mol.

A.0.127

B.0.290

C.0.368

D.0.667

E.0.873

The lid is tightly sealed on a rigid flask containing 2.25 L Ar at 22 C and 0.977 atm. If

the flask is heated to 102 C, what is the pressure in the flask?

A.2.86 atm

B.1.27 atm

C.4.53 atm

D.0.769 atm

E.1.73 atm

Copper ores are enriched to increase the percentage of copper by a process called ____.

A.electrolysis

B.flotation

C.roasting

D.tempering

E.filtering

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 a ketone?

A.ROH

B.ROR’

C.RCOR’

D.RCO2R’

E.RCHO

Which of the following are valid reasons why vegetable oil has a greater viscosity than

diethyl ether, CH3OCH3?

1/ Oil molecules have long chains that become entangled.

2/ Unlike diethyl ether, oil molecules are not held together by hydrogen bonds.

3/ Intermolecular forces are greater for the larger oil molecules.

A.1 only

B.2 only

C.3 only

D.1 and 3

E.2 and 3