Cem 58429 | Course Paper

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For a metals that crystallizes in face-centered cubic unit cell, what percentage of the

space in the cell is occupied by the metal atoms?

A.47%

B.52%

C.68%

D.74%

E.87%

A(n) ____ is a colloidal dispersion of a solid in a liquid.

A.gel

B.emulsion

C.aerosol

D.foam

E.sol

Zn reacts with hydrochloric acid.

Zn(s) + 2 HCl(aq) ZnCl2(aq) + H2(g)

What volume of 3.05 M HCl(aq) will react with 25.0 g Zn(s)?

A.0.251 L

B.4.01 L

C.0.125 L

D.0.0627 L

E.2.33 L

How many moles of Mg3P2(s) can be produced from the reaction of 0.14 mol Mg(s)

with 0.020 mol P4(s)?

6 Mg(s) + P4(s) 2 Mg3P2(s)

A.0.047 mol

B.0.14 mol

C.0.42 mol

D.0.020 mol

E.0.040 mol

For a second-order decomposition reaction,

2A B rate = k[A]2

which of the following functions can be plotted versus time to give a straight line?

A.[A]

D.ln[A]

A 0.0050 g sample of boron contains ____ B atoms.

A.4.6 10“4

B.7.7 10“28

C.2.8 1020

D.3.1 1021

E.3.3 1022

The boiling point of ammonia is “33.3 C. What is this temperature in kelvin?

A.”306.5 K

B.”33.3 K

C.239.9 K

D.306.5 K

E.331.5 K

How many protons, neutrons, and electrons are in a silver atom with a mass number of

108?

A.47 protons, 47 neutrons, 61 electrons

B.47 protons, 61 neutrons, 47 electrons

C.61 protons, 47 neutrons, 47 electrons

D.47 protons, 108 neutrons, 47 electrons

E.61 protons, 108 neutrons, 61 electrons

For a given reaction, the rate constant doubles when the temperature is increased from

45.0 C to 73.0 C. What is the activation energy for this reaction? (R = 8.314 J/Kmol)

A.0.676 kJ/mol

B.9.85 kJ/mol

C.16.1 kJ/mol

D.22.7 kJ/mol

E.65.4 kJ/mol

An element consists of three isotopes. The abundance of one isotope is 92.21% and its

atomic mass is 27.97693 u. The abundance of the second isotope is 4.70% and its

atomic mass is 28.97649 u. The atomic mass of the third isotope is 29.97376 u. What is

the average atomic mass of the element?

A.28.09 u

B.28.98 u

C.28.96 u

D.29.87 u

E.29.07 u

What are the approximate O-S-O bond angles in SO3

2″?

A.90

B.109.5

C.120

D.180

E.90 and 180

Carbon monoxide reacts with oxygen to form carbon dioxide.

2 CO(g) + O2(g) 2 CO2(g)

In a 1.00 L flask, 4.30 atm of CO reacts with 2.50 atm of O2. Assuming that the

temperature remains constant, what is the final pressure in the flask?

A.1.80 atm

B.2.50 atm

C.4.30 atm

D.4.65 atm

E.6.80 atm

Linus Pauling noticed that the energy of a polar bond is often greater than expected. He

attributed the greater bond energy to

A.a coulombic attraction between atoms with partially positive and negative charges.

B.the greater bond lengths of the heteronuclear bonds.

C.one of the many unexplainable phenomena that scientists encounter.

D.the ability of heteronuclear species to form double and triple bonds.

E.the greater number of valence electrons found in heteronuclear molecules.

Consider the reaction

Cu2+(aq) + 4 NH3(aq) Cu(NH3)4

2+(aq) Kf = 2.1 1013

If Ksp for Cu(OH)2 is 2.2 10“20, what is the value of the equilibrium constant, K, for the

reaction below?

Cu(NH3)4

2+(aq) + 2 OH“(aq) Cu(OH)2(s) + 4 NH3(aq)

A.1.0 10“33

B.4.6 10“7

C.2.1 1013

D.2.2 106

E.9.5 1032

Calculate DfH for sulfur dioxide given the thermochemical equations below.

2 S(s) + 3 O2(g) 2 SO3(g) DrH = “791.5 kJ/mol-rxn

2 SO2(g) + O2(g) 2 SO3(g) DrH = “197.9 kJ/mol-rxn

A.”296.8 kJ/mol-rxn

B.”395.7 kJ/mol-rxn

C.”494.7 kJ/mol-rxn

D.”593.6 kJ/mol-rxn

E.”989.4 kJ/mol-rxn

Which of the following statements concerning the cubic unit cell is/are CORRECT?

1/ For cubic unit cells, three cell symmetries occur: primitive cubic, face-centered

cubic, and body-centered cubic.

2/ The cell edges of a cubic unit cell are all equal in length.

3/ The corner angles of a cubic cell are 90.

A.1 only

B.2 only

C.3 only

D.2 and 3

E.1, 2, and 3

How many liters of 0.1107 M KCl(aq) contain 2.50 g of KCl?

A.0.277 L

B.0.303 L

C.3.71 10-3 L

D.3.30 L

E.5.94 10-4 L

The boiling point of liquid oxygen is 90.2 K. What is this temperature in celsius?

A.”208.0 C

B.”183.0 C

C.90.2 C

D.194.4 C

E.363.4 C

What is the correct answer to the following expression: (995 + 8) 0.47015? Carry out

the addition operation first.

A.500

B.470

C.472

D.471.6

E.471.56

Which of the following statements is/are CORRECT?

1/ The transuranium elements are created in a nuclear reaction sequence that begins

with bombardment of a lighter nucleus with low energy helium nuclei.

2/ A low energy neutron may be captured by a nucleus, giving a product in which the

mass number is increased by one unit.

3/ Nuclear reactions involving neutron capture followed by gamma ray emission are

referred to as (n, g) reactions.

A.1 only

B.2 only

C.3 only

D.2 and 3

E.1, 2, and 3

Which of the following hybridized atoms is not possible?

A.an sp hybridized nitrogen atom

B.an sp2 hybridized oxygen atom

C.an sp3 hybridized boron atom

D.an sp3d hybridized phosphorus atom

E.an sp3d2 hybridized chlorine atom

If the energy of 1.00 mole of photons is 245 kJ, what is the wavelength of the light?

A.122 nm

B.488 nm

C.1220 nm

D.787 nm

E.811 nm

The radius of an potassium atom is 0.227 nm. What is the radius in millimeters?

A.2.27 10“9 mm

B.2.27 10“8 mm

C.2.27 10“7 mm

D.2.27 10“6 mm

E.2.27 10“4 mm

What is the correct formula for an ionic compound that contains magnesium ions and

phosphide ions?

A.MgP

B.MgP2

C.Mg3P2

D.Mg3(PO4)2

E.Mg2P3

Electronegativity is a measure of

A.the ability of a substance to conduct electricity.

B.the charge on a polyatomic cation.

C.the charge on a polyatomic anion.

D.the ability of an atom in a molecule to attract electrons to itself.

E.the oxidation number of an atom in a molecule or polyatomic anion.

All of the following compounds are insoluble in water except ____.

A.BaCO3

B.PbF2

C.Fe(OH)3

D.Ni(ClO4)2

E.PbCrO4

What is the pH of 1.0 M Na2SO3(aq) at 25 C? (Ka1 = 1.2 10“2, Ka2 = 6.2 10“8)

A.3.40

B.6.03

C.7.96

D.10.40

E.10.60

If 0.1800 g of impure soda ash (Na2CO3) is titrated with 15.66 mL of 0.1082 M HCl,

what is the percent purity of the soda ash?

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

A.17.96%

B.49.89%

C.50.11%

D.94.13%

E.99.77%

Which of the following elements is not a metalloid?

A.boron

B.selenium

C.germanium

D.arsenic

E.silicon

If the molality of a NaBr(aq) solution is 2.50 m, what is the weight percent of NaBr?

The molar mass of NaBr is 102.9 g/mol.

A.20.5%

B.25.0%

C.25.7%

D.34.6%

E.65.4%

Which of the following statements is INCORRECT?

A.Diagnostic imaging of the human digestive tract often requires a patient to consume a

slurry of BaSO4(s), a compound that contains the toxic Ba2+ ion.

B.Hydroxyapatite is a calcium containing compound that is the main component of

tooth enamel.

C.Beryllium is toxic. Exposure (by breathing) to beryllium can cause berylliosis.

D.Most magnesium is obtained from seawater, where it is present at a roughly 0.05 M

concentration.

E.Calcium is the central element in chlorophyll.

Which functional group does not contain an oxygen atom?

A.ester

B.ether

C.aldehyde

D.amide

E.amine

Hydrofluoric acid has a pKa value of 3.14. What is the value of pKb for fluoride ion?

A.1.4 10“11

B.7.2 10“4

C.3.14

D.10.86

E.17.14

Determine the number of unpaired electrons in a Cu(II) tetrahedral complex.

A.0

B.1

C.2

D.3

E.4

How many sigma (s) bonds and pi (p) bonds are in carbon dioxide?

A.three s, zero p

B.two s, one p

C.two s, two p

D.one s, two p

E.zero s, three p

A point in a standing wave that has zero amplitude is called a(n) ________.

Cis-1,2-dichloroethylene and trans-1,2-dichloroethylene are examples of ________

isomers.

In combustion analysis, the gases produced by the combustion of a hydrocarbon are

passed through a tube containing finely divided NaOH supported on asbestos. The

purpose of the NaOH is to absorb ________ produced by the combustion reaction.

A class of aluminosilicate, called a(n) ________, contains regularly spaced holes and

cavities. This type of aluminosilicate is often used as a catalyst.

The reaction of 5.07 g N2 with 0.722 g H2 produces 1.27 g NH3. The percent yield of

this reaction is ________.

In thermodynamics, a(n) ________ is defined as the object, or collection of objects,

being studied. The surroundings include everything else.

Two important biological buffer systems control pH in the range between 6.9 and 7.4.

These buffer systems are H2CO3/HCO3

“ and ________.

H2PO4

Aqueous colloidal solutions can be classified as ________ (water-fearing), or

hydrophilic (water-loving).

Silicon is purified in a process called ________, where a narrow segment of a silicon

rod is melted and allowed to slowly recrystallize.

Given the initial rate data for the reaction A + B C, determine the rate expression for the

reaction.

[A], M [B], M D[C]/Dt (initial) M/s

430 0.150 2.32 10“3

Which theory, valence bond or molecule orbital, correctly predicts the existence of

paramagnetic molecules?

Write balanced reduction and oxidation half-reactions for the processes that occur at the

cathode and anode of a fuel cell used aboard NASA’s space shuttles.

PCl3 can be produced from the reaction of P4 with Cl2.

P4(s) + 6 Cl2(g) 4 PCl3(g)

If 1.00 g P4 reacts with 1.00 g Cl2, which reactant is the limiting reactant? What mass

of product may be produced?

What are two ways in which real gases differ from ideal gases?