1) Given the data in the table below, ΔH°rxn for the reaction
3NO2 (g) + H2O (l) → 2HNO3 (aq) + NO (g)
is ________ kJ.
A) 64
B) 140
C) -140
D) -508
E) -64
2) A 25.0 mL sample of 0.150 M hydrazoic acid is titrated with a 0.150 M NaOH
solution. What is the pH after 26.0 mL of base is added? The Ka of hydrazoic acid is 1.9
x 10-5.
A) 2.54
B) 11.47
C) 7.00
D) 4.70
E) 4.74
3) What is the mole fraction of sodium chloride in solution that is 13.0% by mass
sodium chloride and that has a density of 1.10 g/mL?
A) 0.0442
B) 0.0462
C) 0.223
D) 0.483
E) 0.505
4) Since air is a mixture, it does not have a “molar mass.” However, for calculation
purposes, it is possible to speak of its “effective molar mass.” (An effective molar mass
is a weighted average of the molar masses of a mixture’s components.) If air at STP has
a density of 1.285 g/L, its effective molar mass is ________ g/mol.
A) 26.94
B) 31.49
C) 30.00
D) 34.42
E) 28.80
5) Using the van der Waals equation, the pressure in a 22.4 L vessel containing 1.50
mol of chlorine gas at 0.00 °C is ________ atm. (a = 6.49 L2-atm/mol2, b = 0.0562
L/mol)
A) 0.993
B) 1.50
C) 0.676
D) 1.91
E) 1.48
6) Which combination of protons, neutrons, and electrons is correct for the isotope of
copper,
A) 29 p+, 34 n°, 29 e–
B) 29 p+, 29 n°, 63 e–
C) 63 p+, 29 n°, 63 e–
D) 34 p+, 29 n°, 34 e–
E) 34 p+, 34 n°, 29 e–
7) Thermodynamic Quantities for Selected Substances at 298.15 K (25 oC)
The value of S o for the oxidation of carbon to carbon monoxide,
2C (s, graphite) + O2 (g) –> 2CO (g)
is ________ J/K mol. Carbon monoxide is produced in the combustion of carbon with
limited oxygen.
A) -12.8
B) +408.6
C) -408.6
D) +179.4
E) +395.8
8) The concentration of chloride ions in a 0.193 M solution of potassium chloride is
________.
A) 0.0643 M
B) 0.386 M
C) 0.0965 M
D) 0.579 M
E) 0.193 M
9) What is the oxidation number of chromium in Cr[(NH3)4Cl2]Cl?
A) -3
B) +3
C) +2
D) -2
E) 0
10) Of the three types of radioactivity characterized by Rutherford, which type does not
become deflected by a magnetic field?
A) ²-rays
B) ±-rays and ²-rays
C) ±-rays
D) ³-rays
E) ±-rays, ²-rays, and ³-rays
11) The molarity (M) of an aqueous solution containing 22.5 g of sucrose (C12H22O11)
in 35.5 mL of solution is ________.
A) 0.0657
B) 1.85 x 10-3
C) 1.85
D) 3.52
E) 0.104
12) The molar concentration of hydro xide ion in pure water at 25 oC is ________.
A) 1.00
B) 0.00
C) 1.0 x 10-14
D) 1.0 x 10-7
E) 7.00
13) A solution containing which one of the following pairs of substances will be a
buffer solution?
A) KI, HI
B) AgBr, HBr
C) CuCl, HCl
D) CsI, HI
E) none of the above
14) The molar volume of a gas at STP is ________ L.
A) 0.08206
B) 62.36
C) 1.00
D) 22.4
E) 14.7
15) Using the data in the table, which of the conjugate bases below is the weakest base?
A) OAc–
B) CHO2
–
C) ClO–
D) F–
E) OAc– and CHO2
–
16) Which of the following statements is false?
A) Nonpolar liquids tend to be insoluble in polar liquids.
B) The weaker the attraction between the solute and solvent molecules, the greater the
solubility.
C) Substances with similar intermolecular attractive forces tend to be soluble in one
another.
D) The solubility of a gas increases in direct proportion to its partial pressure above the
solution.
E) The solubility of gases in water decreases with increasing temperature.
17) ( 2SO3 (g) 2SO2 (g) + O2 (g)
A) K2
B) 2K
C) 1/2K
D) 1/K2
E) -K2
18) The name of CH3-CH C CH-CH-CH CH-CH3 is ________.
A) 2, 3, 5 – octatriene
B) 2, 5, 6 – octatriene
C) 2, 3, 6 – octatriene
D) 3, 5, 6 – octatriene
E) 3, 4, 7 – octatriene
19) What are the spectator ions in the reaction between KOH (aq) and HNO3 (aq)?
A) K+ and H+
B) H+ and OH–
C) K+ and NO3
–
D) H+ and NO3
–
E) OH– only
20) In the Bohr model of the atom, ________.
A) electrons travel in circular paths called orbitals
B) electrons can have any energy
C) electron energies are quantized
D) electron paths are controlled by probability
E) both A and C
21) In their compounds, the charges on the alkali metals and the alkaline earth metals
are ________ and ________, respectively.
22) A substance is ________ if its ions or atoms have one or more unpaired electrons.
23) The anaerobic conversion of carbohydrates to ethanol is driven by the presence of
________.
24) An assembly of a metal ion and the Lewis bases bonded to it is called a(n)
________.
25) When 0.800 grams of NaOH is dissolved in 100.0 grams of water, the temperature
of the solution increases from 25.00 °C to 27.06 °C. The amount of heat absorbed by
the water is ________ J. (The specific heat of water is 4.18 J/g-°C.)
26) If a metal forms more than one oxide, the acidic character of the oxide increases as
the oxidation state of the metal ________.
27) What group in the periodic table would the fictitious element : : be found?