1) How many pairs of unpaired electrons are there in one molecule of dinitrogen
monoxide?
A) 4
B) 3
C) 5
D) 2
E) 1
2) The following reaction is second order in [A] and the rate constant is 0.039 M-1s-1:
A –> B
The concentration of A was 0.26 M at 28 s. The initial concentration of A was ________
M.
A) 0.36
B) 2.8
C) -1.2
D) -1.5
E) -0.83
3) Thermodynamic Quantities for Selected Substances at 298.15 K (25 oC)
The value of S o for the decomposition of gaseous sulfur dioxide to solid elemental
sulfur and gaseous oxygen,
SO2 (g) –> S (s, rhombic) + O2 (g)
is ________ J/K mol.
A) +485.4
B) +248.5
C) -11.6
D) -248.5
E) +11.6
4) The value of ΔH° for the reaction below is -126 kJ. The amount of heat that is
released by the reaction of 10.0 g of Na2O2 with water is ________ kJ.
2Na2O2 (s) + 2H2O (l) → 4NaOH (s) + O2 (g)
A) 8.08
B) 16.2
C) 67.5
D) 32.3
E) -126
5) When the following equation is balanced, the coefficient of H2S is ________.
FeCl3 (aq) + H2S (g) → Fe2S3 (s) + HCl (aq)
A) 1
B) 2
C) 3
D) 5
E) 4
6) A meal containing a burger, fries, and a milkshake contains 53.0 grams of fat, 38.0
grams of protein, and 152 grams of carbohydrate. The respective fuel values for protein,
fat, and carbohydrate are 17, 38, and 17 kJ/g, respectively. If swimming typically burns
1100.0 kJ/hour, ________ minutes of swimming are required to completely burn off the
meal.
A) 4.78
B) 33.5
C) 62.5
D) 10.5
E) 286
7) Consider the following species when answering the following questions:
(i) PCl3(ii) CCl4(iii) TeCl4(iv) XeF4(v) SF6
In which of the molecules does the central atom utilize d orbitals to form hybrid
orbitals?
A) (i) and (ii)
B) (iii) only
C) (i) and (v)
D) (iii), (iv), and (v)
E) (v) only
8) What happens to the mass number and the atomic number of an element when it
undergoes beta decay?
A) Neither the mass number nor the atomic number changes.
B) The mass number decreases by 4 and the atomic number decreases by 2.
C) The mass number does not change and the atomic number increases by 1.
D) The mass number does not change and the atomic number decreases by 2.
E) The mass number increases by 2 and the atomic number increases by 1.
9) Only the most active metals react with oxygen to form ________.
A) oxides
B) superoxides
C) peroxides
D) ozonides
E) water
10) The element ________ is the most similar to sodium in chemical and physical
properties.
A) Mg
B) Br
C) N
D) K
E) Sr
11) Which structure below represents a ketone?
A)
B)
C)
D)
E)
12) The Keq for the equilibrium below is 5.4 x 1013 at 480.0 oC.
2NO (g) + O2 (g) 2NO2 (g)
What is the value of Keq at this temperature for the following reaction?
4NO (g) + 2O2 (g) 4NO2 (g)
A) 2.9 x 1027
B) 8.5 x 1054
C) 3.4 x 10-28
D) -1.1 x 1014
E) 5.4 x 1013
13) How many grams of sodium carbonate contain 1.773 x 1017 carbon atoms?
A) 3.121 x 10-5
B) 1.011 x 10-5
C) 1.517 x 10-5
D) 9.100 x 10-5
E) 6.066 x 10-5
14) For a molecule with the formula AB3, the molecular shape is ________.
A) linear, octahedral, or bent
B) linear, bent, or trigonal planar
C) linear, bent, or T-shaped
D) tetrahedral
E) trigonal planar, trigonal pyramidal, or T-shaped
15) Astatine has a(n) ________ density and a(n) ________ atomic radius compared to
iodine.
A) greater; greater
B) smaller; greater
C) smaller; smaller
D) greater; smaller
E) equal; equal
16) The mole fraction of nitrous oxide in dry air near sea level is 0.00000050. The
concentration of nitrous oxide is ________ molecules per liter, assuming an
atmospheric pressure of 739 torr and a temperature of 29.5 oC.
A) 1.5 10-5
B) 2.0 10-8
C) 1.2 1016
D) 8.9 1018
E) 1.2 1017