CHEM 56232 | Course Paper

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How many lone pairs of electrons are assigned to the carbon atom in carbon dioxide?

A.0

B.1

C.2

D.3

E.4

What is the pH of a solution that results from adding 150.0 mL of 0.200 M HCl to

150.0 mL of 0.350 M NH3? (Kb of NH3 = 1.8 10“5)

A.9.01

B.9.13

C.9.26

D.9.50

E.10.01

Upon combustion, ethene (C2H4) is converted to carbon dioxide and water.What

change in the hybridization of carbon occurs in this reaction?

A.sp to sp2

B.sp2 to sp3

C.sp3 to sp

D.sp2 to sp

E.sp3 to sp2

Which three elements are likely to have similar chemical and physical properties?

A.boron, silicon, and germanium

B.sodium, magnesium, and aluminum

C.sodium, potassium, and rubidium

D.oxygen, sulfur, and chlorine

E.carbon, nitrogen, and oxygen

Equilibrium is established between a liquid and its vapor when

A.the rate of evaporation equals the rate of condensation.

B.equal masses exist in the liquid and gas phases.

C.equal concentrations (in molarity) exist in the liquid and gas phases.

D.all the liquid has evaporated.

E.the liquid ceases to evaporate and the gas ceases to condense.

Which two elements are most abundant in our solar system?

A.hydrogen and helium

B.hydrogen and oxygen

C.helium and iron

D.hydrogen and iron

E.carbon and oxygen

Convert 0.449 bar to mm Hg. (1 atm = 760 mm Hg = 101.3 kPa = 1.013 bar)

A.337 mm Hg

B.0.591 mm Hg

C.5.89 10“4 mm Hg

D.0.443 mm Hg

E.0.455 mm Hg

How many bromide ions are in 0.55 g of iron(III) bromide?

A.1.1 1021 ions

B.3.4 1021 ions

C.3.3 1023 ions

D.9.9 1023 ions

E.2.9 1026 ions

What is the common name for PH3?

A.laughing gas

B.hydrazine

C.nitroglycerin

D.ammonia

E.phosphine

Which of the following statements is/are CORRECT?

1/ A diamagnetic substance is strongly attracted to a magnetic field.

2/ Substances that retain their magnetism after they are withdrawn from a magnetic

field are called ferromagnetic.

3/ Most transition metals and all lanthanide metals are ferromagnetic.

A.1 only

B.2 only

C.3 only

D.1 and 3

E.1, 2, and 3

The hydrolysis of an ester in the presence of NaOH produces

A.a carboxylate salt of sodium and an alcohol.

B.an ether and an amide.

C.an alcohol and an amine.

D.an aldehyde and an ether.

E.an ether and a carboxylate salt of sodium.

How many lone pairs of electrons are assigned to the nitrogen atom in NCl3?

A.0

B.1

C.2

D.3

E.4

The molar mass of platinum is 195.08 g/mol. What is the mass of 1.00 102 Pt atoms?

A.8.51 x 10“25 g

B.3.24 x 10“24 g

C.1.67 x 10“22 g

D.3.24 x 10“22 g

E.3.24 x 10“20 g

Calculate DrG for the reaction below at 25.0 C

CH4(g) + H2O(g) 3 H2(g) + CO(g)

given DfG [CH4(g)] = “50.8 kJ/mol, DfG [H2O(g)] = “228.6 kJ/mol, DfG [H2(g)] = 0.0

kJ/mol, and DfG [CO(g)] = “137.2 kJ/mol.

A.”416.3 kJ/mol-rxn

B.”142.2 kJ/mol-rxn

C.+142.2 kJ/mol-rxn

D.+315.0 kJ/mol-rxn

E.+416.3 kJ/mol-rxn

Which intermolecular force or bond is responsible for the density of H2O(s) being less

than that of H2O( )?

A.London dispersion forces

B.hydrogen bonding

C.ionic bonding

D.covalent bonding

E.dipole/induced dipole forces

Determine the standard enthalpy of formation of calcium carbonate from the

thermochemical equations given below.

Ca(OH)2(s) CaO(s) + H2O( ) DrH = 65.2 kJ/mol-rxn

Ca(OH)2(s) + CO2(g) CaCO3(s) + H2O( ) DrH = -113.8 kJ/mol-rxn

C(s) + O2(g) CO2(g) DrH = -393.5 kJ/mol-rxn

2 Ca(s) + O2(g) 2 CaO(s) DrH = -1270.2 kJ/mol-rxn

A.-1712.3 kJ/mol-rxn

B.-441.8 kJ/mol-rxn

C.-849.6 kJ/mol-rxn

D.-980.6 kJ/mol-rxn

E.-1207.6 kJ/mol-rxn

A student analyzed a first-order reaction and obtained the graph below. Unfortunately,

the student forgot to label the axes. What are the correct labels for the x and y axes?

A.x axis = time, y axis = ln[A]

B.x axis = ln[time], y axis = [A]

C.x axis = ln[time], y axis = [A]

D.x axis = time, y axis = 1/[A]

E.x axis = 1/time, y axis = 1/[A]

Place the following atoms in order of increasing atomic radii: Se, Sb, Br, and Te.

A.Br < Se < Te < Sb

B.Se < Br < Sb < Te

C.Se < Br < Te < As

D.Sb < Te < Se < Br

E.Te < Sb < Se < Br

Which of the following statements is INCORRECT?

A.It is not possible to know the exact location of an electron and its exact energy

simultaneously.

B.The energies of an atom’s electrons are quantized.

C.Quantum numbers define the energy states and the orbitals available to an electron.

D.The behavior of an atom’s electrons can be described by circular orbits around a

nucleus.

E.Electrons have both wave and particle properties.

All of the following statements concerning molecular orbital (MO) theory are correct

EXCEPT

A.the Pauli exclusion principle is obeyed.

B.Hund’s rule is obeyed.

C.electrons are assigned to orbitals of successively higher energy.

D.a bonding molecular orbital is lower in energy than its parent atomic orbitals.

E.the combination of two atomic orbitals creates only one molecular orbital.

Oxides of the alkaline earth family form ____ upon reaction with water.

A.basic solutions

B.acidic solutions

C.alkaline earth hydrides

D.oxygen gas

E.hydrogen gas

Which symbol represents a beta particle?

What is the name of the compound having the formula K2[PtCl4]?

A.potassium chloroplatinate(II)

B.potassium tetrachloroplatinate(II)

C.potassium chloroplatinate(IV)

D.potassium platanotetrachlorate(II)

E.dipotassium tetrachloroplatnum(II)

For which of the following compounds is it possible for cis and trans isomers to exist?

A.1 only

B.2 only

C.3 only

D.1 and 2

E.1, 2, and 3

The phase diagram for CO2 has a triple point at “56.6 C and 5.19 atm, and a critical

point at 31.0 C and 73 atm. The solid and gas phases are in equilibrium at “78.7 C and

1.00 atm. Which of the following statements regarding CO2 is/are CORRECT?

1/ Sublimation occurs if the temperature of the solid phase is increased from “79.0 C to

0.0 C at a constant pressure of 2.5 atm.

2/ CO2 is a supercritical fluid at 55 C and 75 atm.

3/ At pressures greater than its critical pressure (73 atm), CO2 will not exist as a solid at

any temperature.

A.1 only

B.2 only

C.3 only

D.1 and 2

E.1, 2, and 3

In the following reaction

SO3

2″(aq) + H2O( ) HSO3

“(aq) + OH“(aq)

A. SO3

2″ is and acid and HSO3

“ is its conjugate base.

B. SO3

2″ is a base and HSO3

“ is its conjugate acid.

C. SO3

2″ is a base and H2O is its conjugate acid

D. SO3

2″ is an acid and OH“ is its conjugate base.

E.HSO3

“ is an acid and OH“ is its conjugate base.

The thermochemical equation for the formation of ammonia from elemental nitrogen

and hydrogen is as follows.

N2(g) + 3 H2(g) 2 NH3(g) DH = “92.2 kJ

Given a system that is initially at equilibrium, which of the following actions cause the

reaction to proceed to the left?

A.adding N2(g)

B.removing NH3(g)

C.adding a catalyst

D.decreasing the temperature

E.removing H2(g)

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

1/ Osmosis involves the movement of ions through a semipermeable membrane until

the charges on both sides of the membrane are equal.

2/ Solvents move from regions of low solute concentration to regions of higher solute

concentration.

3/ Osmotic pressure is a colligative property.

A.1 only

B.2 only

C.3 only

D.2 and 3

E.1, 2, and 3

A gaseous mixture of NO2 and N2O4 is in equilibrium. If the concentration of NO2 is

8.1 10“4 M, what is the concentration of N2O4?

2 NO2(g) N2O4(g) Kc = 170

A.5.6 10“5 M

B.1.1 10“4 M

C.2.2 10“4 M

D.1.9 10“2 M

E.1.4 10“1 M

The fuel cells used aboard NASA’s Space Shuttles are electrochemical cells that

generate electricity from which overall chemical reaction?

A.Fe2O3(s) + Al(s) Fe(s) + Al2O3(s)

B.Pb(s) + PbO2(s) + 2 H2SO4(aq) 2 PbSO4(s) + 2 H2O( )

C.2 NiO(OH)(s) + Cd(s) + H2O( ) 2 Ni(OH)2(s) + Cd(OH)2(s)

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

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