1) Which one of the following is not true concerning radon?
A) It decays by alpha emission.
B) It decays to polonium-218, an alpha emitter.
C) It is chemically active in human lungs.
D) It has been implicated in lung cancer.
E) It is generated as uranium decays.
2) The combustion of propane (C3H8) in the presence of excess oxygen yields CO2 and
H2O:
C3H8 (g) + 5O2 (g) → 3CO2 (g) + 4H2O (g)
When 2.5 mol of O2 are consumed in their reaction, ________ mol of CO2 are
produced.
A) 1.5
B) 3.0
C) 5.0
D) 6.0
E) 2.5
3) According to MO theory, overlap of two p atomic orbitals produces ________.
A) two bonding molecular orbitals
B) one bonding molecular orbital and one antibonding molecular orbital
C) two bonding molecular orbitals and two antibonding molecular orbitals
D) two bonding molecular orbitals and one antibonding molecular orbital
E) three bonding molecular orbitals and three antibonding molecular orbitals
4) The rate law of the overall reaction
A + B –> C
is rate = k[A]2. Which of the following will not increase the rate of the reaction?
A) increasing the concentration of reactant A
B) increasing the concentration of reactant B
C) increasing the temperature of the reaction
D) adding a catalyst for the reaction
E) All of these will increase the rate.
5) What is the pOH of a 0.030 M solution of barium hydro xide?
A) 12.78
B) 12.48
C) 1.52
D) 1.22
E) 10.41
6) The reaction between nitrogen dioxide and water is a ________.
A) decomposition
B) combustion
C) disproportionation
D) neutralization
E) replacement
7) Of the following, the entropy of ________ is the largest.
A) HI (g)
B) HBr (g)
C) HCl (g)
D) HCl (s)
E) HCl (l)
8) What is the missing product from this reaction?
Cm –> _____ + He
A) Pu
B) U
C) Cf
D) Fm
E) Cm
9) Which group 6A element is not commonly found in a positive oxidation state?
A) sulfur
B) selenium
C) oxygen
D) tellurium
E) polonium
10) The value of ΔH° for the reaction below is -1107 kJ:
2Ba (s) + O2 (g) → 2BaO (s)
How many kJ of heat are released when 5.75 g of BaO (s) is produced?
A) 56.9 kJ
B) 23.2 kJ
C) 20.8 kJ
D) 193 kJ
E) 96.3 kJ
11) The formula of palladium (IV) sulfide is ________.
A) Pd2S4
B) PdS4
C) Pd4S
D) PdS2
E) Pd2S2
12) The density of ________ is 1.70 g/L at STP.
A) F2
B) NO
C) CH4
D) Ne
E) CO
13) The energy of a photon that has a wavelength of 9.0 m is ________ J.
A) 2.2 X 10-26
B) 4.5 X 1025
C) 6.0 X 10-23
D) 2.7 X 109
E) 4.5 X 10-25
14) Alcohols are hydrocarbon derivatives in which one or more hydrogens have been
replaced by a hydroxyl functional group. ________ is the general formula of an alcohol.
A) R-O-R
B) R-CO-R
C) R-CO-OH
D) R-OH
E) R-CO-H
15) Lithium and nitrogen react in a combination reaction to produce lithium nitride:
6Li (s) + N2 (g) → 2Li3N (s)
In a particular experiment, 2.50-g samples of each reagent are reacted. The theoretical
yield of lithium nitride is ________ g.
A) 2.51
B) 2.09
C) 12.5
D) 4.18
E) 6.2
16) For which one of the following reactions is the value of ΔH°rxn equal to ΔH°f for
the product?
A) 2C (s, graphite) + 2H2 (g) → C2H4 (g)
B) N2 (g) + O2 (g) → 2NO (g)
C) 2H2 (g) + O2 (g) → 2H2O (l)
D) 2H2 (g) + O2 (g) → 2H2O (g)
E) H2O (l) + 1/2 O2 (g) → H2O2 (l)
17) Which one of the following substances is more likely to dissolve in benzene
(C6H6)?
A) CH3CH2OH
B) NH3
C) NaCl
D) CCl4
E) HBr