CHEM 19814 | Course Paper

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Assuming the following reaction proceeds in the forward direction,

Fe3+(aq) + Co(s) Fe2+(aq) + Co2+(aq)

A.Fe3+(aq) is oxidized and Co(s) is reduced.

B.Fe3+(aq) is oxidized and Co2+(aq) is reduced.

C.Co(s) is oxidized and Fe3+(aq) is reduced.

D.Co(s) is oxidized and Co2+(aq) is reduced.

E.Fe2+(aq) is oxidized and Co(s) is reduced.

If a chemical reaction is exothermic, but not spontaneous, which of the following must

be true?

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

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

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

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

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

What is the monomer of Teflon?

A.CH2CH2

B.CF2CF2

C.CH2C(CN)2

D.CH2CHCN

E.CH2CHCH3

Assuming ideal behavior, which of the following solutions should have the lowest

freezing point?

A.pure H2O

B.1.0 m MgCl2(aq)

C.1.0 m RbBr(aq)

D.1.0 m NH3(aq)

E.1.0 m C6H12O6(aq)

Calculate the activation energy, Ea, for

N2O5(g) 2 NO2(g) + 1/2 O2(g)

given k (at 45.0 C) = 5.79 10“4 s“1 and k (at 60.0 C) = 3.83 10“3 s“1. (R = 8.314 J/Kmol)

A.0.256 kJ/mol

B.2.83 kJ/mol

C.31.1 kJ/mol

D.111 kJ/mol

E.389 kJ/mol

Arrange Cl2, ICl, and Br2 in order from lowest to highest boiling point.

A.Cl2 < Br2 < ICl

B.Cl2 < ICl < Br2

C.ICl < Cl2 < Br2

D.Br2 < Cl2 < ICl

E.Br2 < ICl < Cl2

How many hydrogen atoms are present in 1.0 g of NH3?

A.0.059 atoms

B.0.18 atoms

C.3.5 1022 atoms

D.1.1 1023 atoms

E.1.2 1022 atoms

Choose which central atom in the following molecules is most electronegative.

A.PH3

B.CH4

C.H2S

D.H2O

E.NH3

For the overall reaction

A + 2B C

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

consistent with the rate equation below?

rate = k[A][B]

A.A + B I (fast)

I + A C (slow)

B.A + B I (slow)

I + B C (fast)

C.2B I (slow)

A + I C (fast)

D.2B I (fast)

I + A C (slow)

E.A + 2B I (fast)

I + B C + B (slow)

An impure sample of sodium carbonate, Na2CO3, is titrated with 0.113 M HCl

according to the reaction below.

2 HCl(aq) + Na2CO3(aq) CO2(g) + H2O( ) + 2 NaCl(aq)

What is the percent of Na2CO3 in a 0.613 g sample if the titration requires 26.14 mL of

HCl? The molar mass of Na2CO3 is 106.0 g/mol.

A.0.295%

B.15.7%

C.25.5%

D.51.1%

E.67.9%

The products of the complete combustion of octane, C8H18, are carbon dioxide and

water. Write a balanced chemical equation for this reaction.

A.C8H18( ) 8 C(s) + 9 H2(g)

B.C8H18( ) + 25 O2(g) 8 CO2 (g) + 9 H2O(g)

C.2 C8H18( ) + 25 O2(g) 16 CO2(g) + 18 H2O(g)

D.C8H18( ) + 16 O2(g) 8 CO2(g) + 9 H2(g)

E.2 C8H18( ) + 17 O2(g) 16 CO(g) + 18 H2O(g)

Normal boiling point is defined as

A.the temperature at which the vapor pressure of a liquid equals 1 atm.

B.the pressure at which any liquid boils at 373.15 K.

C.the temperature at which water boils in a vacuum.

D.the temperature at which the liquid and gaseous phases of a substance have equal

densities.

E.the temperature at which the enthalpy of vaporization equals 100.0 kJ/mol.

What is the correct formula for calcium nitrate?

A.CaN

B.Ca3N2

C.CaNO2

D.Ca3(NO3)2

E.Ca(NO3)2

At 50 C, the water ionization constant, Kw, is 5.48 10“14. What is the H3O+

concentration in neutral water at this temperature?

A.3.00 10“27 M

B.2.74 10“14 M

C.5.48 10“14 M

D.2.34 10“7 M

E.1.01 10“7 M

Which combination of atoms is most likely to produce a compound with ionic bonds?

A.B and C

B.S and O

C.N and F

D.Si and Cl

E.Mg and O

What 2″ ion has the following ground state electron configuration?

A.oxide ion

B.nitride ion

C.fluoride ion

D.sulfide ion

E.magnesium ion

If 0.357 g of CH4 gas is introduced into an evacuated 1.75 L flask at 25 C, what is the

pressure inside the flask? (R = 0.08206 Latm/molK)

A.0.952 atm

B.0.261 atm

C.0.311 atm

D.0.419 atm

E.4.99 atm

Under certain conditions the reaction of ammonia with excess oxygen will produce a

29.5% yield of NO. What mass of NH3 must react with excess oxygen to yield 157 g

NO?

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

A.89.1 g

B.302 g

C.263 g

D.26.3 g

E.938 g

At 25 C, all of the following ionic compounds produce a basic aqueous solution, except

____.

A.NaF

B.Na3PO4

C.NaNO2

D.NaHSO4

E.NaCH3CO2

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

2 NO(g) + O2(g) 2 NO2(g)

given DfG [NO(g)] = +86.6 kJ/mol and DfG [NO2(g)] = +51.2 kJ/mol.

A.3.9 10“13

B.1.0

C.2.6 1012

D.1.6 106

E.3.8 1028

Potassium reacts with chlorine gas to produce potassium chloride. How many moles of

K will react with 0.40 moles of Cl2?

A.0.20 mol

B.0.32 mol

C.0.40 mol

D.0.60 mol

E.0.80 mol

Which of the following alcohols is likely to be least soluble in water?

A.3-pentanol

B.2-butanol

C.1,2-ethanediol

D.1,2,3-propanetriol

E.methanol

Chromium (atomic mass 52.00 g/mol) crystallizes in a body-centered cubic unit cell. If

the length of an edge of the unit cell is 289 pm, what is the density (in g/cm3) of

chromium?

A.3.58 g/cm3

B.7.15 g/cm3

C.13.7 g/cm3

D.14.3 g/cm3

E.21.3 g/cm3

Point D on the phase diagram is referred to as the ________ point.

A.triple

B.normal boiling

C.critical

D.normal freezing

E.divergent

The Ostwald process is an industrial method of producing ____ from the oxidation of

____.

A.nitric acid, ammonia

B.ammonia, nitric acid

C.ammonia, nitrogen

D.nitric acid, nitrogen

E.dinitrogen monoxide, nitrogen

Ions such as [Co(H2O)6]3+ and [Ag(CN)2]“ are called ____.

A.ligands

B.Lewis bases

C.chelates

D.alloys

E.coordination complexes

Nitric acid, HNO3, dissociates in water to form nitrate ions and hydronium ions. What

change in hybridization of the nitrogen atom occurs in this dissociation?

A.sp2 to sp3

B.sp2 to sp

C.sp3 to sp

D.sp to sp3

E.no change

What is the coordination number of the central metal ion in [Cr(en)2(OH)2]NO3? (en =

H2NCH2CH2NH2)

A.0

B.2

C.4

D.6

E.7

Hydrogen bonding is present in all of the following molecular solids EXCEPT ____.

A.H2SO4 (dihydrogen sulfate)

B.CH3OH (methanol)

C.CH3OCH3 (dimethyl ether)

D.HF (hydrogen fluoride)

E.CH3CO2H (acetic acid)

Which of the following statements concerning radiation absorption by living tissue

is/are CORRECT?

1/ The “quality factor” takes into account the differences in damaging power of the

various forms of radiation.

2/ One gray denotes the absorption of 1 joule per kilogram of tissue.

3/ The SI unit for biological damage is a sievert (Sv), which is determined by

multiplying grays by the quality factor.

A.1 only

B.2 only

C.3 only

D.2 and 3

E.1, 2, and 3

Nitroglycerine decomposes violently according to the chemical equation below. What

mass of carbon dioxide gas is produced from the decomposition of 5.00 g C3H5(NO3)3?

4 C3H5(NO3)3( ) 12 CO2(g) + 6 N2(g) +10 H2O(g) + O2(g)

A.15.0 g

B.0.969 g

C.11.6 g

D.2.91 g

E.0.323 g

The most reactive nonmetallic element is ____. This element has been shown to form

compounds with every other element except He and Ne.

A.oxygen

B.fluorine

C.lithium

D.phosphorus

E.carbon

Which 1+ ion has the ground state electron configuration [Kr]4d10?

A.Ru

B.Au

C.Ag

D.In

E.Cd