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1) In metallic hydrides, the oxidation number of hydrogen is considered to be
________.
A) -2
B) -1
C) 0
D) +1
E) +2
2) A gas at a pressure of 10.0 Pa exerts a force of ________ N on an area of 5.5 m2.
A) 55
B) 0.55
C) 5.5
D) 1.8
E) 18
3) Given the data in the table below, ΔH°rxn for the reaction
2Ag2S (s) + O2 (g) → 2Ag2O (s) + 2S (s)
is ________ kJ.
A) -1.6
B) +1.6
C) -3.2
D) +3.2
E) The ΔH°f of S (s) and of O2 (g) are needed for the calculation.
4) The Keq for the equilibrium below is 7.52 x 10-2 at 480.0 oC.
2Cl2 (g) + 2H2O (g) 4HCl (g) + O2 (g)
What is the value of Keq at this temperature for the following reaction?
8HCl (g) + 2O2 (g) 4Cl2 (g) + 4H2O (g)
A) 1.77 x 102
B) 5.66 x 10-3
C) 1.50 x 10-1
D) -7.52 x 10-2
E) 7.52 x 10-2
5) Thermodynamic Quantities for Selected Substances at 298.15 K (25 oC)
The value of S o for the formation of calcium chloride from its constituent elements,
Ca (s) + Cl2 (g) --> CaCl2 (s)
is ________ J/K mol.
A) -104.6
B) +104.6
C) +369.0
D) -159.8
E) +159.8
6) Which substance would be the most soluble in gasoline?
A) water
B) NaNO3
C) HCl
D) hexane
E) NaCl
7) A 25.0 mL sample of 0.723 M HClO4 is titrated with a 0.27 M KOH solution. The
H3O+ concentration after the addition of 80.0 mL of KOH is ________ M.
A) 0.4
B) 1 x 10-7
C) 0.7
D) 3 x 10-13
E) 4 x 10-2
8) A nitrogen oxide is 63.65% by mass nitrogen. The molecular formula could be
________.
A) NO
B) NO2
C) N2O
D) N2O4
E) either NO2 or N2O4
9) ________ is the abbreviation for the prefix mega-.
A) k
B) m
C) M
D) n
E) d
10) In a polyatomic molecule, "localized" bonding electrons are associated with
________.
A) one particular atom
B) two particular atoms
C) all of the atoms in the molecule
D) all of the € bonds in the molecule
E) two or more bonds in the molecule
11) The missing product from this reaction is ________.
Cl + _____ --> Ar + e
A) He
B) e
C) n
D) e
E)
12) Which process in the Global Water Cycle involves the phase transition H2O (l) -->
H2O (g)?
A) evaporation from fresh water
B) fog drip
C) plant uptake
D) freshwater storage
E) snowmelt runoff to streams
13) The wavelength of light that has a frequency of 1.66 X 109 s-1 is ________ m.
A) 0.181
B) 5.53
C) 2.00 X 10-9
D) 5.53 X 108
E) none of the above
14) Which of the following correctly represents the electron affinity of phosphorus?
A) P (g) → P+ (g) + e-
B) P (g) + e- → P- (g)
C) P4 (g) + e- → P- (g)
D) P4 (g) + 4e- → 4P- (g)
E) P+ (g) + e- → P (g)
15) What is the concentration (M) of 39.88 mL of an unknown NaOH solution if it
required 46.08 mL of 0.6592 M HCl to neutralize?
A) 0.7617
B) 2788
C) 1211
D) 1.313
E) 1.211
16) Aluminum forms an ion with a charge of ________.
A) 2+
B) 3-
C) 1+
D) 3+
E) 1-
17) The value of G o (kJ/mol) at 25 oC is -57.5. What is the equilibrium constant for
this reaction at this temperature expressed with 2 significant digits?
A) 1.2 x 1010
B) 10
C) 1.0
D) 8.4 x 10101
E) more information is needed
18) In the symbol below, X = ________.
X
A) Zr
B) K
C) Sc
D) Br
E) not enough information to determine
