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1) The formula weight of ammonium sulfate ((NH4)2SO4), rounded to the nearest
integer, is ________ amu.
A) 100
B) 118
C) 116
D) 132
E) 264
2) How many moles of Co2+ are present in 0.200 L of a 0.400 M solution of CoI2?
A) 2.00
B) 0.500
C) 0.160
D) 0.0800
E) 0.0400
3) The density of NO2 in a 4.50 L tank at 760.0 torr and 25.0 °C is ________ g/L.
A) 1.64
B) 9.30
C) 1.68
D) 1.88
E) 3.27
4) A sample of N2 gas (2.0 mmol) effused through a pinhole in 5.5 s. It will take
________ s for the same amount of CH4 to effuse under the same conditions.
A) 7.3
B) 5.5
C) 3.1
D) 4.2
E) 9.6
5) Using the table of average bond energies below, the H for the reaction is ________
kJ.
→
A) +506
B) -931
C) -506
D) -129
E) +129
6) The element hydrogen has the symbol ________.
A) H
B) He
C) K
D) B
E) Ar
7) Which statements about viscosity are true?
(i)Viscosity increases as temperature decreases.
(ii)Viscosity increases as molecular weight increases.
(iii)Viscosity increases as intermolecular forces increase.
A) (i) only
B) (ii) and (iii)
C) (i) and (iii)
D) none
E) all
8) As one gains altitude in the atmosphere, based on the ionization energies shown
below, which sequence of mole fractions is the correct one?
ProcessIonization Energy (kJ/mol)
N2 + h½ --> N2
+ + e- 1495
O2 + h½ --> O2
+ + e- 1205
O + h½ --> O+ + e- 1313
NO + h½ --> NO+ + e- 890
A) N2 > N > NO > O2
B) N2 > O > O2 > NO
C) N2 > O2 > O > NO
D) NO > O2 > O > N2
E) All will be equal.
9) 1 nanometer = ________ picometers
A) 1000
B) 0.1
C) 0.01
D) 1
E) 10
10) The spectator ions in the reaction between aqueous perchloric acid and aqueous
barium hydroxide are ________.
A) OH- and ClO4
-
B) H+, OH- , ClO4
-, and Ba2+
C) H+ and OH-
D) H+ and Ba2+
E) ClO4
- and Ba2+
11) The heat of fusion of water is 6.01 kJ/mol. The heat capacity of liquid water is 75.3
J/mol K. The conversion of 50.0 g of ice at 0.00 oC to liquid water at 0.00oC requires
________ kJ of heat.
A) 6.01
B) 16.7
C) 75.3
D) 17.2
E) Insufficient data are given.
