Inorganic Chemistry (30 questions on
test)
6.
Supercooled water at –10°C can
spontaneously warm to 0°C in a perfectly
insulated container. This is possible
because
A. supercooled materials do not obey energy
conservation laws.
B. supercooled water needs less energy for
change of temperature than ordi-
nary water.
C. a small amount of energy is given to the
surroundings.
D. some of the water freezes and this provides
energy.
E. ice is unusual in that it is less dense than
liquid water.
7.
How many grams of NaOH (40.0 g/mol) are
required to make 250 ml of a
0.500 M solution?
A. (250)(0.500)
B. (250)(500)
1000
C. (250)(0.500)(40.0)
1000
D.
1000
0
(250)(0.500)(40.0)
E. (250)(0.500)(40.0)
8.
What is the percentage of oxygen by weight in
Zn(H2PO4)2 (259g/mol)?
A. 53.3%
B. 24.7%
C. 39.5%
D. 6.18%
E. 49.4%
9.
At 0°C and 1.0 atmosphere pressure (STP)
22.0 grams of gas occupies 11.2
liters. The gas could be which of the
following?
A. CO2
= 44g/mol
B. CO = 28g/mol
C. NH3
= 17g/mol
D. CH4
= 16g/mol
E. C4H10
= 58g/mol
10.
When the following equation is properly
balanced, the coefficient of H2O is
Mg3N2 +
H2O
Mg(OH)2
+ NH3
A. 9
B. 6
C. 4
D. 3
E. 2
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