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1) You have to calculate the volume of a gas sample with mass of 1.000 X 103 g and
density of 1.027 g/L, but you have forgotten the formula. Which way of reasoning
would help you in finding the correct mass?
A) If 1.027 g of a gas takes up a volume of 1 L, then 1.000 X 103 g of the same gas
takes up a volume of __________.
B) If 1.027 L of gas has a mass of 1 g, then __________ L has the mass of 1.000 X 103
g.
2) Homogeneous mixtures are also known as ________.
A) solids
B) compounds
C) elements
D) substances
E) solutions
3) When ionizing radiation enters the body, what is the predominant free radical
produced?
A) H
B) H3O
C) protein
D) OH
E) H2O
4) Given the data in the table below and ΔH°rxn for the reaction
SO2Cl2 (g) + 2H2O (l) → H2SO4 (l) + 2HCl (g)H° = -62 kJ
H°f of HCl (g) is ________ kJ/mol.
A) -184
B) 60
C) -92
D) 30
E) Insufficient data are given.
5) What is the concentration (in M) of hydronium ions in a solution at 25.0 oC with pH
= 4.146?
A) 4.15
B) 9.85
C) 1.40 x 10-10
D) 7.15 x 10-5
E) none of the above
6) Thermodynamic Quantities for Selected Substances at 298.15 K (25 oC)
The value of G o at 25 oC for the formation of POCl3 from its constituent elements,
P2 (g) + O2 (g) + 3Cl2 (g) --> 2POCl3 (g)
is ________ kJ/mol.
A) -1108.7
B) +1108.7
C) -606.2
D) +606.2
E) -1,005
7) How many moles of K+ are present in 343 mL of a 1.27 M solution of K3PO4?
A) 0.436
B) 1.31
C) 0.145
D) 3.70
E) 11.1
8) A solution is prepared by dissolving 10.0 g of benzene (C6H6) in 282 g of carbon
tetrachloride (CCl4). The concentration of benzene in this solution is ________ molal.
The molar masses of C6H6 and CCl4 are 78.1 g/mol and 154 g/mol, respectively.
A) 4.54 x 10-4
B) 0.454
C) 0.0654
D) 0.0342
E) 3.42
9) The diagram below is the Born-Huber cycle for the formation of crystalline
potassium fluoride.
Which energy change corresponds to the electron affinity of fluorine?
A) 2
B) 5
C) 4
D) 1
E) 6
10) A reaction was found to be third order in A. Increasing the concentration of A by a
factor of 3 will cause the reaction rate to ________.
A) remain constant
B) increase by a factor of 27
C) increase by a factor of 9
D) triple
E) decrease by a factor of the cube root of 3
11) In the Rutherford nuclear-atom model, ________.
A) the heavy subatomic particles, protons and neutrons, reside in the nucleus
B) the three principal subatomic particles (protons, neutrons, and electrons) all have
essentially the same mass
C) the light subatomic particles, protons and neutrons, reside in the nucleus
D) mass is spread essentially uniformly throughout the atom
E) the three principal subatomic particles (protons, neutrons, and electrons) all have
essentially the same mass and mass is spread essentially uniformly throughout the atom
12) Which of the following statements is false?
A) The change in entropy in a system depends on the initial and final states of the
system and the path taken from one state to the other.
B) Any irreversible process results in an overall increase in entropy.
C) The total entropy of the universe increases in any spontaneous process.
D) Entropy increases with the number of microstates of the system.
13) The total number of orbitals in a shell is given by ________.
A) I2
B) n2
C) 2n
D) 2n + 1
E) 2l + 1
