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1) Calculate the molarity of hydro xide ion in an aqueous solution that has a pOH of
3.00.
A) 1.0 x 10-3
B) 11.00
C) 1.0 x 10-11
D) 3.0 x 10-14
E) 1.1 x 10-13
2) A substance that expands to fill its container yet has a density approaching that of a
liquid, and that can behave as a solvent is called a(n) ________.
A) plasma
B) gas
C) liquid
D) amorphous solid
E) supercritical fluid and gas
3) The van der Waals equation for real gases recognizes that ________.
A) gas particles have non-zero volumes and interact with each other
B) molar volumes of gases of different types are different
C) the non-zero volumes of gas particles effectively decrease the amount of "empty
space" between them
D) the molecular attractions between particles of gas decreases the pressure exerted by
the gas
E) all of the above statements are true
4) How many electrons does the As3- ion possess?
A) 30
B) 36
C) 2
D) 8
E) 33
5) For which one of the following reactions is the value of ΔH°rxn equal to ΔH°f for the
product?
A) 2Ca (s) + O2 (g) → 2CaO (s)
B) C2H2 (g) + H2 (g) → C2H4 (g)
C) 2C (graphite) + O2 (g) → 2CO (g)
D) 3Mg (s) + N2 (g) → Mg3N2 (s)
E) C (diamond) + O2 (g) → CO2 (g)
6) Arrange the following gases in order of increasing average molecular speed at 25 °C.
Cl2, O2, F2, N2
A) Cl2 < F2 < O2 < N2
B) Cl2 < O2 < F2 < N2
C) N2 < F2 < Cl2 < O2
D) Cl2 < F2 < N2 < O2
E) F2 < O2 < N2 < Cl2
7) Thermodynamic Quantities for Selected Substances at 298.15 K (25 oC)
The value of S o for the oxidation of solid elemental sulfur to gaseous sulfur trioxide,
2S (s, rhombic) + 3O2(g) --> 2SO3 (g)
is ________ J/K mol.
A) +19.3
B) -19.3
C) +493.1
D) -166.4
E) -493.1
8) An unknown element is found to have three naturally occurring isotopes with atomic
masses of 35.9675 (0.337%), 37.9627 (0.063%), and 39.9624 (99.600%). Which of the
following is the unknown element?
A) Ar
B) K
C) Cl
D) Ca
E) None of the above could be the unknown element.
9) This reaction is an e x ample of ________.
Kr --> Rb + _____
A) alpha decay
B) beta decay
C) positron decay
D) electron capture
E) gamma emission
10) Of the following, the central atom is sp3d2 hybridized only in ________.
A) PCl5
B) XeF4
C) PH3
D) Br3
-
E) BeF2
11) The value of G o at 373 K for the oxidation of solid elemental sulfur to gaseous
sulfur dioxide,
S (s, rhombic) + O2 (g) --> SO2 (g)
is ________ kJ/mol. At 298 K, H o for this reaction is -269.9 kJ/mol, and S o is
+11.6 J/K.
A) -300.4
B) +300.4
C) -4,597
D) +4,597
E) -274.2
12) Natural, unpolluted rainwater is typically acidic. What is the source of this natural
acidity?
A) CO2
B) SO2
C) NO2
D) HCl
E) chlorofluorocarbons
13) The enzyme nitrogenase converts ________ into ________.
A) ammonia, urea
B) CO and unburned hydrocarbons, H2O and CO2
C) nitrogen, ammonia
D) nitrogen oxides, N2 and O2
E) nitroglycerine, nitric acid, and glycerine
