A 7.3648 g sample of an oxide of mercury, when heated in a stream of hydrogen,
produces Hg( ) and 0.6126 g H2O. What is formula for the compound?
A.Hg2O
B.HgO
C.Hg2O3
D.Hg2O5
E.HgO2
What is the correct number of significant figures in 0.000620?
A.2
B.3
C.4
D.6
E.7
Hund’s rule states that the most stable arrangement of electrons (for a ground state
electron configuration)
A.has a filled valence shell of electrons.
B.has three electrons per orbital, each with identical spins.
C.has values greater than or equal to +1.
D.has the maximum number of unpaired electrons, all with the same spin.
E.has two electrons per orbital, each with opposing spins.
What is the name of the compound having the formula [Ru(CO)6](ClO4)3?
A.hexacarbonmonoxideruthenium(III) perchlorate
B.hexacarbonmonoxideruthenium(II) chloro tetroxide
C.trichloratehexacarbonylruthenate(III)
D.hexacarbonylruthenium(II) chlorate
E.hexacarbonylruthenium(III) perchlorate
Which element has the ground state electron configuration 1s22s22p63s23p3?
A.V
B.P
C.Si
D.Ti
E.As
An atom located on a face of a unit cell is shared equally between ____ unit cells.
A.2
B.3
C.4
D.6
E.8
Which of the following elements generally acts as an oxidizing agent?
A.Br2
B.H2
C.Fe
D.C
E.Li
Aluminum is resistant to corrosion because
A.the surface of aluminum is coated with unreactive AlN.
B.the surface of aluminum is coated with unreactive Al2O3.
C.aluminum is a noble metal.
D.aluminum has the greatest density of all naturally occurring metals.
E.aluminum has a large positive standard reduction potential.
Which of the following statements concerning entropy is/are CORRECT?
1/ The entropy of a substance increases when converted from a liquid to a solid.
2/ The entropy of a substance decreases as its temperature increases.
3/ All substances have positive entropy values at temperatures above 0 K.
A.1 only
B.2 only
C.3 only
D.1 and 2
E.1, 2, and 3
The Ka of bicarbonate ion, HCO3
“, is 4.8 10“11. What [CO3
2″]/[HCO3
“] ratio is
necessary to make a buffer with a pH of 11.00?
A.0.21
B.0.32
C.0.68
D.4.8
E.6.8
The central atom in the triiodide ion, I3
“, is surrounded by
A.two single bonds and no lone pairs of electrons.
B.two single bonds and two lone pairs of electrons.
C.two single bonds and three lone pairs of electrons.
D.one single bond, one double bond, and one lone pair of electrons.
E.two double bonds and one lone pair of electrons.
The average velocity of a gas molecule is
A.inversely proportional square root of its mass.
B.inversely proportional to the gas constant, R.
C.directly proportional to the square of its temperature in K.
D.inversely proportional to its kinetic energy.
E.directly proportional to the square of its temperature in C.
For a chemical reaction, if DrG = 0, then ____.
A.K > 1
B.K = 0
C.K = “1
D.K < 0
E.K = 1
Calculate the number of moles of aluminum oxide in 6.83 g Al2O3.
A.6.70 x 10“2 mol
B.6.96 x 102 mol
C.0.253 mol
D.0.127 mol
E.1.56 x 10“3 mol
What is the equilibrium constant for the following reaction at 25 C.
HCl(aq) + KOH(aq) H2O( ) + KCl(aq)
A.1.00 10“14
B.1.00 10“7
C.1.00
D.1.00 10+7
E.1.00 10+14
How many sigma (s) bonds and pi (p) bonds are in the following molecule?
A.seven s and three p
B.seven s and two p
C.five s and five p
D.five s and three p
E.five s and two p
As bound ligands, which of the following causes the largest splitting of d-orbitals?
A.phen
B.H2O
C.I“
D.CN“
E.C2O4
2″
What is the energy (in kilojoules per mole) of ultraviolet light with a wavelength of 228
nm?
A.8.71 10“22 kJ
B.19.1 kJ
C.131 kJ
D.456 kJ
E.525 kJ
At 0.982 atm, the height of mercury in a barometer is 0.746 m. If the mercury were
replaced with ethanol, what height of ethanol (in meters) would be supported at this
pressure? The densities of Hg and ethanol are 13.5 g/cm3 and 0.789 g/cm3, respectively.
A.0.0436 m
B.0.946 m
C.0.760 m
D.12.8 m
E.13.0 m
Calculate the enthalpy change (DrH) for the decomposition of hydrogen peroxide,
2 H2O2(g) 2 H2O(g) + O2(g)
given the bond enthalpies of the reactants and products.
Bond Bond Enthalpy
(kJ/molrxn)
H-H 436
O-H 463
O-O 146
O=O 498
A.”314 kJ
B.”206 kJ
C.”498 kJ
D.”255 kJ
E.+314 kJ
Use VSEPR theory to predict the electron-pair geometry and the molecular geometry of
nitrogen trichloride, NCl3.
A.The electron-pair geometry is linear, the molecular geometry is linear.
B.The electron-pair geometry is trigonal-planar, the molecular geometry is
trigonal-planar.
C.The electron-pair geometry is trigonal-planar, the molecular geometry is bent.
D.The electron-pair geometry is tetrahedral, the molecular geometry is tetrahedral.
E.The electron-pair geometry is tetrahedral, the molecular geometry is
trigonal-pyramidal.
What is the hybridization of the sulfur atom in SCl2?
A.sp
B.sp2
C.sp3
D.sp3d
E.sp3d2
Which method is correct for converting kelvin to Celsius?
A.
B.
C.
D.
E.
What is the molar solubility of Mn(OH)2(s) in a solution that is buffered at pH 8.00 at
25 C? The Ksp of Mn(OH)2 is 1.9 10“13 at 25 C.
A.3.6 10“8 mol/L
B.1.9 10“7 mol/L
C.3.6 10“5 mol/L
D.1.9 10“1 mol/L
E.1.9 103 mol/L
The decomposition of formic acid follows first-order kinetics.
HCO2H(g) CO2(g) + H2(g)
The half-life for the reaction at 550 C is 24 seconds. How many seconds does it take for
the formic acid concentration to decrease by 87.5%?
A.24 s
B.36 s
C.48 s
D.72 s
E.96 s
The masses of isotopes and their abundances are determined experimentally using
A.a mass spectrometer.
B.an analytical balance.
C.a centrifuge.
D.filtration followed by distillation.
E.electrolysis.
A molecular orbital that decreases the electron density between two nuclei is said to be
____.
A.hybridized
B.bonding
C.antibonding
D.pi-bonding
E.nonpolar
If 26.5 g of methanol (CH3OH) is added to 735 g of water, what is the molality of the
methanol?
A.0.0348 m
B.2.03 m
C.1.13 m
D.3.61 m
E.36.1 m
Hydrocyanic acid, HCN, is a weak acid. Write a net ionic equation for the reaction of
aqueous hydrocyanic acid and aqueous sodium hydroxide.
A.HCN(aq) + NaOH(aq) Na+(aq) + CN“(aq) + H2O( )
B.HCN(aq) + H2O(aq) CN“(aq) + H3O+(aq)
C.H+(aq) + OH“(aq) H2O( )
D.HCN(aq) + OH“(aq) CN“(aq) + H2O( )
E.H+(aq) + NaOH(aq) Na+(aq) + H2O( )
What is the formal charge on each atom in dichloromethane, CH2Cl2?
A.C atom = 0, each H atom = 0, and each Cl atom = 0
B.C atom = “2, each H atom = +1, and two Cl atoms = 0
C.C atom = +4, each H = “1, and each Cl atom = “1
D.C atom = +4, each H = +1, and each Cl atom = “1
E.C atom = “4, each H = +1, and each Cl atom = +1
When strongly heated, boric acid breaks down to boric oxide and water. What mass of
boric oxide is formed from the decomposition of 15.0 g B(OH)3?
2 B(OH)3(s) B2O3(s) + 3 H2O(g)
A.7.50 g
B.15.0 g
C.8.44 g
D.16.9 g
E.33.8 g
Which of the following statements concerning ground state electron configurations
is/are CORRECT?
1/ For a hydrogen atom with one electron, the 2s and 2p orbitals have identical energies.
2/ For a lithium atom with three electrons, the 2s and 2p orbitals have different energies.
3/ The effective nuclear charge felt by an electron in a 2p orbital is greater for a carbon
atom than for a boron atom.
A.1 only
B.2 only
C.3 only
D.2 and 3
E.1, 2, and 3
The standard cell potential of the following electrochemical cell is 0.19 V.
Pt | Sn4+(aq, 1.0 M), Sn2+(aq, 1.0 M) || Cu2+(aq, 0.200 M) | Cu
Which factor will increase measured cell potential of the galvanic cell?
A.switching from a platinum to a graphite anode
B.increasing the size of the anode
C.decreasing the concentration of Cu2+
D.increasing the concentration of Sn4+
E.decreasing the temperature of the cell
Which of the following statements concerning a supercritical fluid (SCF) is/are
CORRECT?
1/ An SCF has a density similar to that of a gas.
2/ An SCF has a viscosity similar to that of a liquid.
3/ An SCF fills its entire container, much like a gas.
A.1 only
B.2 only
C.3 only
D.1 and 3
E.1, 2, and 3
Given the initial rate data for the decomposition reaction,
A B + C
determine the rate expression for the reaction.
[A], M “D[A]/Dt M/s
042 6.2 10“6
The period 6 transition metals have greater densities than either the period 4 or 5
transition metals. An explanation concerns the 4f orbitals, which are filled with
electrons just prior to the 5d orbitals. As the 4f orbitals are filled, the radii of the
elements decrease. The decrease in size is referred to as the ________ contraction.
A unit used to quantify biological damage is called the ________ or rem.
Significant figures allow us to estimate uncertainty in calculated values. In some
circumstances, following significant figure rules can lead to estimates of uncertainty
that are too high or low. This is the case for the mathematical expression below.
99 1.02 = 100.98
Following the rules governing significant figures in multiplication, the answer can be
rounded to 1.0 102. What is wrong with rounding this answer to two significant figures?
According to Heisenberg’s ________ principle, it is impossible to simultaneously
measure the exact location and energy of an electron.
Hyperventilation can cause your blood pH to rise. One way to lower your blood pH is
to breath into a paper bag, thus recycling the air you exhale. Why does this procedure
lower your blood pH?
One commercial method of producing Cl2 is by electrolysis of aqueous NaCl.
NaCl(aq) + 2 H2O( ) Cl2(g) + 2 NaOH(aq) + H2(g)
Owing to environmental concerns, some manufacturers are shifting to the soda-lime
method for NaOH production. Explain why this method is environmentally preferred.
Write a balanced chemical equation for the production of NaOH from soda ash and
lime.
Which of the following statements is/are CORRECT?
1.The group 3A elements are also known as the chalcogens.
2.The noble gases are sometimes called the rare gases because of their low abundances.
3.The halogens, or group 7A elements, all exist as diatomic molecules.
A.1 only
B.2 only
C.3 only
D.2 and 3
E.1, 2, and 3
The pre-exponential, A, in the Arrhenius equation is called the ________ factor.
Give the name of an acidic oxide and write a balanced chemical equation for the
reaction of the oxide with water.
The numerical quantity of a mole, 6.022 1023, is defined as the number of atoms in a
specific mass of an element. What is the mass and the identity of the element used to
define one mole?
Phenanthroline (C12H8N2) can bind to metal ions using both its ammine groups. It is
referred to as a(n) ________ ligand, meaning it is “two-toothed.”
A cup of oil takes longer to pour from a glass than a cup of water. A liquid’s resistance
to flow is referred to as its ________.
If the ratio of acid to base in a buffer is increased by a factor of 10, the buffer pH
decreases by ________.