Chem 46888 | Course Paper

Unlock access to all the studying documents.

View Full Document

What is the correct formula for potassium dihydrogen phosphate?

A.KH2PO4

B.K2HPO4

C.K2H2PO4

D.K3H2PO4

E.KH2P

Calculate DrG for the reaction below at 25.0 C.

P4O10(s) + 6 H2O( ) 4 H3PO4( )

Species DfH (kJ/mol) S (J/K mol)

P4O10(s) “2984.0 228.9

H2O( ) “285.8 69.95

H3PO4( ) “1279.0 110.5

A.”6119.1 kJ/mol-rxn

B.”632.8 kJ/mol-rxn

C.”355.6 kJ/mol-rxn

D.+210.6 kJ/mol-rxn

E.+6119.1 kJ/mol-rxn

Amino acids polymerize in condensation reactions that result in the formation of an

amide linkage (or peptide bond) between amino acid molecules. What dipeptide(s) may

be formed in the reaction of glycine with phenylalanine?

A.1 only

B.2 only

C.3 only

D.4 only

E.1 and 4

What is the pH of an aqueous solution composed of 0.64 M NH4

+ and 0.20 M NH3?

(Ka of NH4

+ = 5.6 10“10)

A.4.80

B.8.75

C.9.20

D.9.25

E.9.76

Assume that the following chemical reaction is at equilibrium.

2 ICl(g) I2(g) + Cl2(g) DH = +26.9 kJ

At 25 C, Kp = 2.0 105. If the temperature is increase to 45 C, which statement applies?

A.Kp will decrease and the reaction will proceed in the backward direction.

B.Kp will decrease and the reaction will proceed in the forward direction.

C.Kp will remain unchanged and the reaction will proceed in the forward direction.

D.Kp will increase and the reaction will proceed in the backward direction.

E.Kp will increase and the reaction will proceed in the forward direction.

Assume the reaction below

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

proceeds via the following rate expression:

Which of the following statements concerning the above chemical reaction and rate

equation is/are CORRECT?

1/ The reaction is second-order with respect to NO.

2/ The rate of disappearance of O2 is two times the rate of appearance of NO2.

3/ According to the balanced chemical equation, the reaction is fifth-order overall.

A.1 only

B.2 only

C.3 only

D.1 and 3

E.2 and 3

If a cube of ice at 0 C is placed outside on a warm summer day, the ice will melt

spontaneously. 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

If an aqueous solution of ____ is added to a mixture of F“ and SO4

2″, the fluoride ion

will precipitate, but the sulfate ion will remain in solution.

A.LiBr

B.HNO3

C.Pb(ClO4)2

D.MgNO3

E.AlCl3

Which of the following noncyclic hydrocarbons has two p bonds?

A.C3H4

B.C4H8

C.C6H12

D.C7H14

E.C8H18

What is the pH of 0.75 M HCl(aq) at 25 C? (Kw = 1.01 10“14)

A.”0.12

B.0.12

C.0.75

D.2.75

E.13.87

Which of the following cations has the same number of unpaired electrons as Fe2+?

A.Ni2+

B.Fe3+

C.Cr2+

D.Mn2+

E.Co2+

Silver has two stable isotopes with masses of 106.90509 u and 108.9047 u. The average

molar mass of silver is 107.868 u. What is the percent abundance of each isotope?

A.50.0% Ag-107 and 50.0% Ag-109

B.51.8% Ag-107 and 48.2% Ag-109

C.55.4% Ag-107 and 44.6% Ag-109

D.48.2% Ag-107 and 51.8% Ag-109

E.44.6% Ag-107 and 55.4% Ag-109

What mass of Al contains the same number of atoms as 3.0 g Pb?

A.23 g

B.0.014 g

C.3.0 g

D.0.39 g

E.0.11 g

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

1/ Methanol is used as a fuel in high-powered racing cars.

2/ Human consumption of methanol can lead to blindness.

3/ Methanol is converted by the humann body to formaldehyde and formic acid.

A.1 only

B.2 only

C.3 only

D.1 and 3

E.1, 2, and 3

The solubility product equilibrium constant, Ksp, of silver bromide is 5.4 10-13 at 298

AgBr(s) Ag+(aq) + Br–(aq)

What is DrG? (R = 8.314 J/Kmol)

A.-3.0 101 kJ/mol

B.-5.87 kJ/mol

C.5.87 kJ/mol

D.3.0 101 kJ/mol

E.7.0 101 kJ/mol

What are the approximate H-N-H bond angles in NH4

A.109.5

B.120

C.109.5 and 120

D.90

E.90 and 120

How many electrons can be described by the quantum numbers n = 7, = 1?

A.0

B.2

C.6

D.10

E.14

For the reaction 2A + B C, the rate law is

Which of the factor(s) will affect the value of the rate constant for this reaction?

1/ decreasing the temperature

2/ adding a catalyst

3/ decreasing the concentration of reactant A

A.1 only

B.2 only

C.3 only

D.1 and 2

E.2 and 3

The SI unit of temperature is the ____.

A.kelvin

B.calorie

C.fahrenheit

D.ngstrom

E.kilocalorie

If 6.46 L of gaseous ethanol reacts with 16.1 L O2, what is the maximum volume of

gaseous carbon dioxde produced? Assume that the temperature of the reactants and

products is 425 C and the pressure remains constant at 1.00 atm.

CH3CH2OH(g) + 3 O2(g) 2 CO2(g) + 3 H2O(g)

A.6.46 L

B.10.7 L

C.12.9 L

D.16.1 L

E.22.6 L

If the same amount of energy in the form of heat is added to 5.00 g samples of each of

the metals below, which metal will undergo the largest temperature change?

Metal Specific Heat Capacity (J/gK)

Ag 0.235

Al 0.897

Cu 0.385

Fe 0.449

Hg 0.140

A.Ag

B.Al

C.Cu

D.Fe

E.Hg

Which type of experiment demonstrates that an electron has the properties of a wave?

A.nuclear fission

B.electron diffraction

C.light emission from atomic gases

D.mass spectroscopy

E.photoelectric effect

The second law of thermodynamics states that

A.in a spontaneous process, the entropy of the universe increases.

B.there is no disorder in a perfect crystal at 0 K.

C.the total energy of the universe is always increasing.

D.the total energy of the universe is constant.

E.mass and energy are conserved in all chemical reactions.

If the concentration of sodium carbonate in water is 12.8 ppm, what is the molarity of

Na2CO3(aq)? The molar mass of Na2CO3 is 106.0 g/mol. Assume the density of the

solution is 1.00 g/mL.

A.8.28 10“6 M

B.1.21 10“4 M

C.1.36 10“3 M

D.0.136 M

E.0.121 M

For the reaction A + 2B C, the rate law is

What are the units of the rate constant where time is measured in seconds?

Which one of the following compounds is a nonelectrolyte when dissolved in water?

A.HCl

B.CaCl2

C.CCl4

D.Cu(NO3)2

E.NaCH3CO2

What is the pH of the solution at the cathode if = “0.362 V for the following

electrochemical cell at 25 C?

Pt | H2(g, 1.0 atm) | H+(aq, 1.00 M) || H+(aq) | H2(g, 1.0 atm) | Pt

A.1.77

B.3.06

C.6.11

D.7.89

E.12.23

All of the following statements concerning voltaic cells are true EXCEPT

A.a salt bridge allows cations and anions to move between the half-cells.

B.electrons flow from the cathode to the anode in the external circuit.

C.oxidation occurs at the anode.

D.a voltaic cell can be used as a source of energy.

E.a voltaic cell consists of two-half cells.

When propane undergoes complete combustion, the products are carbon dioxide and

water.

__ C3H8(g) + __ O2(g) __ CO2(g) + __ H2O(g)

What are the respective coefficients when the equation is balanced with the smallest

whole numbers?

A.1, 1, 1, 1

B.1, 3, 1, 3

C.1, 3, 3, 1

D.1, 5, 3, 4

E.2, 5, 3, 4

What are the spectator ions in the reaction between aqueous hydrobromic acid and

aqueous sodium hydroxide?

A.Na+ only

B.H+ and OH“

C.Na+ and Br“

D.Br“ only

E.H+, Br“, Na+, and OH“

Which of the following is not a likely oxidation number for iodine?

A.-1

B.0

C.+1

D.+2

E.+7

The functional group RCONR’ is characteristic of a(n) ____.

A.ether

B.ester

C.amide

D.aldehyde

E.ketone

Which species is reduced in the reaction below?

I“(aq) + ClO“(aq) IO“(aq) + Cl“(aq)

A.I“

B.H2O

C.Cl“

D.IO“

E.ClO“

When 10.0 g KOH is dissolved in 100.0 g of water in a coffee-cup calorimeter, the

temperature rises from 25.18 C to 47.53 C. What is the enthalpy change per gram of

KOH dissolved in the water? Assume that the solution has a specific heat capacity of

4.18 J/gK.

A.”116 J/g

B.”934 J/g

C.”1.03 103 J/g

D.”2.19 103 J/g

E.”1.03 104 J/g