1) Under ordinary conditions, a substance will sublime rather than melt if its triple point
occurs at a pressure above atmospheric pressure.
2) Ammonia is a strong base.
3) Xenon can have oxidation states of 2, 4, 6, and 8.
4) HNO2 is a strong acid.
5) The atomic radius of iodine is one-half the distance separating the iodine nuclei.
6) An acid containing the COOH group is called a carbo-o xy acid.
7) If a hydrogen atom electron jumps from the n=6 orbit to the n=2 orbit, energy is
released.
8) The entropy of a pure crystalline substance at 0 oC is zero.
9) Heterogeneous catalysts have different phases from reactants.
10) Renewable energy sources are essentially inexhaustible.
11) Most fresh water in the U.S. is used for agriculture.
12) Electron affinity is a measure of how strongly an atom can attract additional
electrons.
13) For any buffer system, the buffer capacity depends on the amount of acid and base
from which the buffer is made.
14) Elements that readily conduct electricity are elements with low ionization energies.
15) A strong electrolyte is one that ________ completely in solution.
A) reacts
B) associates
C) disappears
D) ionizes
16) The British thermal unit (Btu) is commonly used in engineering applications. A Btu
is defined as the amount of heat required to raise the temperature of 1 lb of water by 1
°F. There are ________ Btu in one Joule. 1 lb = 453.59 g; °C = (5/9)(°F – 32°); specific
heat of H2O (l) = 4.184 J/g-K.
A) 1056 Btu
B) 1.896 x 10-3 Btu
C) 9.278 x 10-4 Btu
D) 5.120 x 10-3 Btu
E) Additional information is needed to complete the calculation.
17) The correct name for N2O5 is ________.
A) nitrous oxide
B) nitrogen pentoxide
C) dinitrogen pentoxide
D) nitric oxide
E) nitrogen oxide
18) The law of constant composition applies to ________.
A) solutions
B) heterogeneous mixtures
C) compounds
D) homogeneous mixtures
E) solids
19) Hydration is a specific example of the phenomenon known generally as ________.
A) salutation
B) disordering
C) solvation
D) condensation
E) dilution
20) What is the de Broglie wavelength (m) of a 2.0-kg object moving at a speed of 50
m/s?
A) 6.6 X 10-36 m
B) 1.5 X 1035 m
C) 5.3 X 10-33 m
D) 2.6 X 10-35 m
E) 3.8 X 1034 m
21) Which one of the following substances is more likely to dissolve in CCl4?
A) CBr4
B) HBr
C) HCl
D) CH3CH2OH
E) NaCl
22) Which of the following statements is false?
A) The absolute value of the heat of sublimation is equal to the absolute value of the
heat of deposition.
B) The heat of sublimation is equal to the sum of the heat of vaporization and the heat
of melting.
C) The heat of sublimation is equal to the sum of the heat of vaporization and the heat
of freezing.
D) The absolute value of the heat of sublimation is equal to the absolute value of the
sum of the heat of condensation and the heat of freezing.
E) The absolute value of the heat of deposition is equal to sum of the absolute value of
the heat of vaporization and the absolute value of the heat of freezing.
23) The oxidation number of N in HNO3 is ________.
A) +1
B) +2
C) +3
D) +4
E) +5
24) Of the following, only ________ is not a state function.
A) S
B) H
C) q
D) E
E) T
25) The molarity of a solution prepared by diluting 43.72 mL of 5.005 M aqueous
K2Cr2O7 to 500. mL is ________.
A) 57.2
B) 0.0044
C) 0.438
D) 0.0879
E) 0.870
26) The correct name for NaHCO3 is ________.
A) sodium hydride
B) persodium carbonate
C) persodium hydroxide
D) sodium bicarbonate
E) carbonic acid
27) SiO4
4- is the ________ ion.
A) orthosilicate ion
B) silicide ion
C) thiosilicate ion
D) silicon tetroxide ion
E) siliconate ion
28) In the world’s oceans, the average salinity is about ________ g/kg.
A) 0.03
B) 0.1
C) 35
D) 17
E) 3.5
29) What is the primary commercial source of elemental nitrogen?
30) For an exothermic reaction, increasing the reaction temperature results in a(n)
________ in K.
31) Given the equation:
CH4 (g) + 2 O2 (g) → CO2 (g) + H2O (l) ΔH = -890.0 kJ
The heat liberated when 34.78 grams of methane (CH4) are burned in an excess amount
of oxygen is ________ kJ.
32) If a reaction is endothermic, ________ the reaction temperature results in an
increase in K.
33) Transition metal ions with empty valence orbitals act as ________.
34) Write the balanced reaction between zinc oxide and sulfuric acid.