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1) On a phase diagram, the critical pressure is ________.
A) the pressure required to melt a solid
B) the pressure below which a substance is a solid at all temperatures
C) the pressure above which a substance is a liquid at all temperatures
D) the pressure at which a liquid changes to a gas
E) the pressure required to liquefy a gas at its critical temperature
2) The isomerization of methylisonitrile to acetonitrile
CH3NC (g) --> CH3CN (g)
is first order in CH3NC. The rate constant for the reaction is 9.45 x 10-5 s-1 at 478 K.
The half-life of the reaction when the initial [CH3NC] is 0.030 M is ________ s.
A) 1.06 x 104
B) 5.29 x 103
C) 3.53 x 105
D) 7.33 x 103
E) 1.36 x 10-4
3) There are ________ valence electrons in the Lewis structure of CH3OCH3.
A) 20
B) 16
C) 18
D) 24
E) 22
4) The formula weight of magnesium fluoride (MgF2), rounded to one decimal place, is
________ amu.
A) 86.6
B) 43.3
C) 62.3
D) 67.6
E) 92.9
5) Which one of the following is a pure substance?
A) tap water
B) rock
C) air
D) elemental oxygen
E) apple
6) Which one of the following exhibits dipole-dipole attraction between molecules?
A) AsH3
B) CBr4
C) SiO2
D) Cl2
E) BH3
7) Which of the following liquids will have the highest freezing point?
A) pure H2O
B) aqueous glucose (0.050 m)
C) aqueous CoI2 (0.030 m)
D) aqueous FeI3 (0.030 m)
E) aqueous NaI (0.030 m)
8) Molecular compounds of low molecular weight tend to be gases at room
temperature. Which of the following is most likely not a gas at room temperature?
A) KBr
B) F2
C) HCN
D) SO2
E) CH4
9) The prefix thio- denotes
A) replacement of an oxygen atom by a sulfur atom.
B) a sulfur€sulfur double bond.
C) sulfur in a negative oxidation state.
D) a sulfur€oxygen double bond.
E) an allotropic form of sulfur.
10) How many different types of resonance structures can be drawn for the ion SO3
2-
where all atoms satisfy the octet rule?
A) 1
B) 2
C) 3
D) 4
E) 5
11) What volume (mL) of 0.102 M NaOH is required to neutralize 17.1 mL of 0.443 M
HCl?
A) 74.3
B) 3.94
C) 0.773
D) 0.0135
E) 0.000773
12) What is the major commercial source of elemental sulfur?
A) sulfide minerals
B) sulfate minerals
C) underground deposits of elemental sulfur
D) seawater
E) coal and petroleum
13) The reaction shown below is responsible for creating 14C in the atmosphere. What
is the bombarding particle?
N + _____ --> C + H
A) alpha particle
B) electron
C) neutron
D) positron
E) proton
14) A sample of a gas originally at 29 °C and 1.25 atm pressure in a 3.0 L container is
allowed to contract until the volume is 2.2 L and the temperature is 11 °C. The final
pressure of the gas is ________ atm.
A) 2.9
B) 2.8
C) 1.6
D) 2.1
E) 0.38
15) The basis for the carbon-14 dating method is that ________.
A) the amount of carbon-14 in all objects is the same
B) carbon-14 is very unstable and is readily lost from the atmosphere
C) the ratio of carbon-14 to carbon-12 in the atmosphere is a constant
D) living tissue will not absorb carbon-14 but will absorb carbon-12
E) All of the above are correct.
