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Graded Quiz 3
Penelope Codding
Started: January 5, 2010 14:39
Questions: 10
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Instructions
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1. 05.01-027
(Points: 1)
The value of
H° for the reaction below is +128.1 kJ:
How many kJ of heat are consumed when 5.75 g of CO (g) is formed as shown in the equation?
a.
23.3
e.
8.3
b.
62.0
c.
26.3
d.
162
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2. 05.01-033
(Points: 1)
The specific heat capacity of lead is 0.13 J/g-K. How much heat (in J) is required to raise the
temperature of
of lead from 22°C to 37°C?
a.
2.0
e.
0.13
b.
-0.13
c.
5.8 x 10-4
d.
29
b.
-1135
c.
+1135
d.
+35
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3. 05.01-038
(Points: 1)
H for the reaction
a.
+355
e.
-35
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4. 05.02-008
(Points: 1)
When a system __________,
E is always negative.
a.
absorbs heat and does work
b.
gives off heat and does work
c.
absorbs heat and has work done on it
d.
gives off heat and has work done on it
e.
none of these is always negative.
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5. 05.02-018
(Points: 1)
Which one of the following statements is true?
a.
Enthalpy is an intensive property.
b.
The enthalpy change for a reaction is independent of the state of the reactants and products.
c.
Enthalpy is a state function.
d.
H is the value of q measured under conditions of constant volume.
e.
The enthalpy change of a reaction is the reciprocal of the
H of the reverse reaction.
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6. 05.02-022
(Points: 1)
Under what condition(s) is the enthalpy change of a process equal to the amount of heat transferred
into or out of the system?
a.
a only
e.
b and c
b.
b only
c.
c only
d.
a and b
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7. 05.02-033
(Points: 1)
Consider the following two reactions:
Determine the enthalpy change for the process:
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a.
-478.8 kJ/mol
b.
-434.6 kJ/mol
c.
434.6 kJ/mol
d.
478.8 kJ/mol
e.
More information is needed to solve the problem.
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8. 05.02-036
(Points: 1)
For which one of the following equations is
a.
Xe (g) + 2F2 (g)
b.
CH4 (g) + 2Cl 2 (g)
c.
N2 (g) + O3 (g)
d.
2CO (g) + O2 (g)
e.
C (diamond) + O2 (g)
H°rxn equal to
Hf° for the product?
XeF4 (g)
CH2Cl 2 (l) + 2HCl (g)
N2O3 (g)
2CO2 (g)
CO2 (g)
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9. 05.01-013
(Points: 1)
The change in the internal energy of a system that absorbs 2,500 J of heat and that does 7,655 J of
work on the surroundings is __________ J.
a.
10,155
b.
5,155
c.
-5,155
d.
-10,155
e.
1.91 x 107
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10. 05.01-051
(Points: 1)
Given the data in the table below,
H°rxn for the reaction
is __________ kJ.
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b.
-150
c.
-1540
d.
-1892
e.
The
Hf° of
O2 (g) is needed for
the calculation.
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05/01/2010 2:42 PM