CEM 12668 | Course Paper

Unlock access to all the studying documents.

View Full Document

What is the product of the addition of HBr to 1-hexene?

A.butane

B.2-bromohexane

C.1-bromohexane

D.1,2-dibromohexane

E.1,2-dibromohexene

Atomic number is the________ in the nucleus of an atom.

A.number of electrons

B.number of protons

C.number of protons minus the number of neutrons

D.sum of the number of electrons and neutrons

E.sum of the number of neutrons and protons

Which of the following sets of quantum numbers is allowed?

A.n = 2, = 1, = +1/2, ms = “1/2

B.n = 3, = 2, = +1, ms = +1

C.n = 4, = 1, = 0, ms = “1/2

D.n = 4, = 3, = “1, ms = 0

E.n = 5, = 2, = +2, ms = “1

What type of orbital is designated n = 4, = 3, = “2?

A.4s

B.4p

C.4d

D.4f

E.none

Which of the following diagrams represent p-orbitals?

A.1 only

B.2 only

C.3 only

D.4 only

E.1 and 2

Which relationship correctly compares the rates of the following reactants and

products?

2 NOCl(g) 2 NO(g) + Cl2(g)

Write a balanced chemical equation which corresponds to the following equilibrium

constant expression.

A.1/2 N2(g) + 3/2 H2(g) NH3(g)

B.N2(g) + 3 H2(g) 2 NH3(g)

C.2 NH3(g) N2(g) + 3 H2(g)

D.NH3(g) 1/2 N2(g) + 3/2 H2(g)

E.2 N2(g) + 6 H2(g) 4 NH3(g)

Place the following cations in order from the lowest to the highest hydration enthalpy:

K+, Ca2+, and Mg2+.

A.K+ < Ca2+ < Mg2+

B.Mg2+ < Ca2+ < K+

C.Ca2+ < K+ < Mg2+

D.Ca2+ < Mg2+ < K+

E.Mg2+ < K+ < Ca2+

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, which of the following

species is least likely to exist (i.e., has the lowest bond order)?

A.H2

2″

B.F2

C.C2

2″

D.O2

E.B2

2″

Convert 8.900 10“8 meters to nanometers and express the answer in standard notation

using the correct number of significant figures.

A.89 nm

B.89.0 nm

C.89.00 nm

D.8.90 nm

E.0.8900

Write a balanced chemical equation for the oxidation of Cd(s) by concentrated nitric

acid, producing NO2(g) and Cd2+(aq).

A.HNO3(aq) + Cd(s) Cd2+(aq) + NO2(g) + OH“(aq)

B.2 HNO3(aq) + Cd(s) Cd2+(aq) + 2 NO2(g) + 2 OH“(aq)

C.HNO3(aq) + Cd(s) + H+(aq) Cd2+(aq) + NO2(g) + H2O( )

D.4 HNO3(aq) + Cd(s) Cd2+(aq) + 2 NO2(g) + 2H2O( ) + 2 NO3

“(aq)

E.HNO3(aq) + Cd(s) Cd2+(aq) + NO2(g)

Which of the following are a pair of isotopes?

A. and

B. and

C. and

D. and

E. and

What is the ground state electron configuration of a mercury atom?

A.[Xe]6s26d10

B.[Kr]5d106s2

C.[Xe]4f145d106s2

D.[Xe]5d106s2

E.[Kr]4d104f146s2

The effective atomic number (EAN) rule states that organometallic coordination

compounds are likely to be stable if

A.the oxidation state of the metal is zero.

B.the sum of the metal valence electrons plus the electrons donated by the ligand equals

18.

C.the ligand field splitting is small.

D.the metal has an even atomic number.

E.the metal has an odd atomic number.

What charge is likely on a monatomic silver cation?

A.2″

B.1″

C.1+

D.2+

E.3+

Polonium (atomic mass 209.0 g/mol) crystallizes in a primitive cubic unit cell. If the

density of polonium is 9.15 g/cm3, what is the radius of a polonium atom (in pm)?

A.168 pm

B.238 pm

C.336 pm

D.475 pm

E.672 pm

The central atom in SF6 is surrounded by

A.six single bonds and no lone pairs of electrons.

B.six single bonds and one lone pair of electrons.

C.six single bonds and two lone pairs of electrons.

D.five single bonds, one double bond, and one lone pair of electrons.

E.four single bonds, two double bonds, and no lone pairs of electrons.

A Faraday, F, is defined as

A.the charge on a single electron.

B.the charge, in coulombs, carried by one mole of electrons.

C.the voltage required to reduce one mole of reactant.

D.the moles of electrons required to reduce one mole of reactant.

E.the charge passed by one ampere of current in one second.

Which of the following compounds has polar covalent bonds: CCl4, Cl2, HCl, and KCl?

A.CCl4 only

B.Cl2 only

C.HCl and KCl

D.Cl2 and KCl

E.CCl4 and HCl

What is the pH of a buffer composed of 0.35 M H2PO4

“(aq) and 0.65 M HPO4

2″(aq)?

(Ka of H2PO4

“ is 6.2 10“8)

A.6.94

B.7.21

C.7.48

D.7.73

E.9.06

Benzene, C6H6, consists of a six member ring of sp2 hybridized carbon atoms. Each

carbon atom has one unhybridized p orbital. How many p2p bonding, antibonding, and

nonbonding molecular orbitals exist for benzene?

A.Three p2p molecular orbitals exist; two bonding and one antibonding.

B.Three p2p molecular orbitals exist; one bonding, one antibonding, and one

nonbonding.

C.Six p2p molecular orbitals exist; three bonding and three antibonding.

D.Six p2p molecular orbitals exist; two bonding, two nonbonding, and two antibonding.

E.Twelve p2p molecular orbitals exist; six bonding and six antibonding.

What is the molecular geometry around a central atom that is sp3d hybridized and has

one lone pair of eletrons?

A.trigonal bipyramidal

B.trigonal-pyramidal

C.see-saw

D.tetrahedral

E.square-planar

Which one of the following molecules will exhibit dipole-dipole intermolecular forces

as a pure liquid?

A.CS2

B.C2H2

C.CCl4

D.Br2

E.PH3

If the ratio of acid to base in a buffer increases by a factor of 10, the pH of the buffer

A.increases by 1.

B.decreases by 1.

C.increases by 10.

D.decreases by 10.

E.remains unchanged.

For the overall reaction

2A + B C

which of the following mechanisms yields the correct overall chemical equation and is

consistent with the rate equation below?

rate = k[A]2[B]

A.A + B I (fast)

I + A C (slow)

B.A + B I (slow)

I + B C (fast)

C.2A I (slow)

B + I C (fast)

D.A + B I (slow)

I + A C (fast)

E.A + 2B I (fast)

I + B C + B (slow)

A 0.175-L flask contains Cl2 at 25 C and 475 mm Hg. What is the pressure of the Cl2 if

the volume is increased to 0.800 L and the temperature increased to 55 C?

A.239 mm Hg

B.94.4 mm Hg

C.114 mm Hg

D.241 mm Hg

E.228 mm Hg

What is the name of the following compound?

A.trans-1-methyl-1-butene

B.cis-1-methyl-1-butene

C.cis-2-pentene

D.cis-3-pentene

E.trans-1-methyl-2-ethylethylene

Who developed the process for obtaining aluminum from bauxite ore?

A.Antoine Lavoisier

B.Fritz Haber

C.Michael Faraday

D.Herman Frasch

E.Charles Hall

The energy required to break one mole of hydrogen-hydrogen bonds in H2 is 436

kJ/mol. What is the longest wavelength of light capable of breaking a single

hydrogen-hydrogen bond?

A.0.688 nm

B.119 nm

C.132 nm

D.274 nm

E.688 nm

Which of the following chemical equations does not correspond to a standard molar

enthalpy of formation?

A.Mg(s) + C(s) + 3/2 O2(g) MgCO3(s)

B.C(s) + 1/2 O2(g) CO(g)

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

D.N2(g) + 2 O2(g) N2O4(g)

E.H2(g) + 1/2 O2(g) H2O( )

Iron reacts with oxygen to produce iron(III) oxide.

4 Fe(s) + 3 O2(g) 2 Fe2O3(s)

If 3.2 moles of Fe react with excess O2, how many moles of Fe2O3 can be formed?

A.1.6 mol

B.2.4 mol

C.3.2 mol

D.4.3 mol

E.6.4 mol

If 25.00 mL of 1.50 M HCl(aq) is diluted with water to a volume of 750.0 mL, what is

the molarity of the diluted HCl(aq)?

A.2.22 10-2 M

B.5.00 10-2 M

C.2.07 10-3 M

D.4.50 101 M

E.1.35 103 M

As pure molecular solids, which of the following exhibits dipole-dipole intermolecular

forces: PH3, SO3, HCl, and CO2?

A.PH3 only

B.HCl only

C.SO3 and CO2

D.PH3 and HCl

E.SO3, HCl, and CO2

What is the mole fraction of calcium chloride in 3.35 m CaCl2(aq)? The molar mass of

CaCl2 is 111.0 g/mol and the molar mass of water is 18.02 g/mol.

A.0.000866

B.0.0569

C.0.271

D.37.2

E.59.2