1) Element X reacts with chlorine to form a compound with the formula XCl2. The
oxide of element X is basic. Element X is ________.
A) Rb
B) Ca
C) Al
D) P
E) H
2) Which of the following statements is true?
A) Q does not change with temperature.
B) Keq does not change with temperature, whereas Q is temperature dependent.
C) K does not depend on the concentrations or partial pressures of reaction components.
D) Q does not depend on the concentrations or partial pressures of reaction
components.
E) Q is the same as Keq when a reaction is at equilibrium.
3) The specific heat capacity of solid copper metal is 0.385 J/g-K. How many joules of
heat are needed to raise the temperature of a 2.12-kg block of copper from 25.0 °C to
99.9 °C?
A) 4.12 x 105 J
B) 61.1 J
C) 6.11 x 104 J
D) 2.42 x 10-6 J
E) 0.00242 J
4) Chlorine can have a positive oxidation state ________.
A) if it combines with bromine or iodine
B) if it combines with oxygen or fluorine
C) if it combines with hydrogen
D) if it combines with an alkali metal
E) in its elemental form
5) Silicones can be oils or rubber-like materials depending on ________.
A) the silicon-to-oxygen ratio
B) the length of the chain and degree of cross-linking
C) the percentage of carbon in the chain
D) the percentage of sulfur in the chain
E) the oxidation state of silicon in the chain
6) What is the pH of a 0.020 M aqueous solution of barium hydro xide?
A) 12.60
B) 12.30
C) 1.70
D) 10.41
E) 1.40
7) When three atomic orbitals are mixed to form hybrid orbitals, how many hybrid
orbitals are formed?
A) six
B) four
C) five
D) three
E) one
8) The initial or tentative explanation of an observation is called a(n) ________.
A) law
B) theory
C) hypothesis
D) experiment
E) test
9) What are the donor atoms in ferrichrome and how many of them are in one
molecule?
A) Cr, 5
B) N, 4
C) O, 6
D) Fe, 4
E) S, 6
10) Of the atoms below, ________ is the least electronegative.
A) B
B) F
C) C
D) N
E) O
11) In which reaction does the oxidation number of oxygen increase?
A) Ba(NO3)2 (aq) + K2SO4 (aq) → BaSO4 (s) + 2KNO3 (aq)
B) HCl (aq) + NaOH (aq) → NaCl (aq) + H2O (l)
C) MgO (s) + H2O (l) → Mg(OH)2 (s)
D) 2SO2 (g) + O2 (g) → 2SO3 (g)
E) 2H2O (l) → 2H2 (g) + O2 (g)
12) The hybridization of the oxygen atom labeled x in the structure below is ________.
A) sp
B) sp2
C) sp3
D) sp3d
E) sp3d2
13) The output of a plant is 4335 pounds of ball bearings per week (five days). If each
ball bearing weighs 0.0113 g, how many ball bearings does the plant make in a single
day? (Indicate the number in proper scientific notation with the appropriate number of
significant figures.)
A) 3.84 X 105
B) 7.67 X 104
C) 867
D) 3.48 X 107
E) 2.91 X 106
14) A solution contains 30 ppm of benzene. The density of the solution is 1.00 g/mL.
This means that ________.
A) there are 30 mg of benzene in 1.0 L of this solution
B) 100 g of the solution contains 30 g of benzene
C) 100 g of the solution contains 30 mg of benzene
D) the solution is 30% by mass of benzene
E) the molarity of the solution is 30 M
15) What is the frequency (s-1) of a photon that has an energy of 4.38 X 10-18 J?
A) 436 s-1
B) 6.61 X 1015 s-1
C) 1.45 X 10-16 s-1
D) 2.30 X107 s-1
E) 1.31 X 10-9 s-1
16) A molecular formula always indicates ________.
A) how many of each atom are in a molecule
B) the simplest whole-number ratio of different atoms in a compound
C) which atoms are attached to which in a molecule
D) the isotope of each element in a compound
E) the geometry of a molecule
17) What is the freezing point (oC) of a solution prepared by dissolving 11.3 g of
Ca(NO3)2
(formula weight = 164 g/mol) in 115 g of water? The molal freezing point depression
constant for water is 1.86 oC/m.
A) -3.34
B) -1.11
C) 3.34
D) 1.11
E) 0.00
18) The density of chlorine (Cl2) gas at 25 °C and 60. kPa is ________ g/L.
A) 20
B) 4.9
C) 1.7
D) 0.86
E) 0.58
19) Calculate the percentage by mass of lead in PbCO3.
A) 17.96
B) 22.46
C) 73.05
D) 77.54
E) 89.22
20) Classify the following compounds as weak bases (W) or strong bases (S):
methylamine
carbonate ion
potassium hydro xide
A) W W S
B) S S S
C) S W W
D) W S S
E) W S W
21) The largest principal quantum number in the ground state electron configuration of
francium is ________.
22) A solution contains 150.8 grams of NaCl in 678.3 grams of water. Calculate the
vapor pressure of water (in torr) over the solution at 25.0 oC. (Note: The vapor pressure
of pure water at 25.0 oC is 23.76 torr.)
23) What noble gas is radioactive?
24) What process replenishes O2?
25) Write the formula for 2-methyl-4-propylnonane.
26) How many moles of BaCl2 are formed in the neutralization of 393 mL of 0.171 M
Ba(OH)2 with aqueous HCl?
27) In the oxidation of ethanol the intermediate formed is ________.