WorksheetsThermochemistry and Electrochemistry
Total questions: 12
Worksheet time: 36mins
Name
Class
Date
1.
When the equation for the following reaction in basic solution is balanced, what is the sum of the coefficients?
MnO2 + HO2- -> MnO4-
MnO2 + HO2- -> MnO4-
a)
18
b)
9
c)
14
d)
11
2.
The following reaction has a ΔGₒ value of 48.47 kJ/mol at 25ₒC.
HB(aq) + H2O(l) <-> H3O+(aq) + B-(aq)
Calculate Ka for the acid HB.
HB(aq) + H2O(l) <-> H3O+(aq) + B-(aq)
Calculate Ka for the acid HB.
a)
0.981
b)
-19.6
c)
4.85 x 10-5
d)
3.19 x 10-9
3.
Given the following in acidic media:
Fe2+ + Cr2O72- -> Fe3+ + Cr3+
answer the following question: The coefficient for water in the balanced reaction is:
Fe2+ + Cr2O72- -> Fe3+ + Cr3+
answer the following question: The coefficient for water in the balanced reaction is:
a)
5
b)
7
c)
3
d)
1
4.
How many electrons are transferred in the following reaction when it is balanced in acidic solution? SO32-(aq) + MnO4-(aq) -> SO42-(aq) + Mn2+(aq)
a)
10
b)
3
c)
2
d)
6
5.
Which energy conversion shown below takes place in a galvanic cell?
a)
electrical to chemical
b)
mechanical to chemical
c)
mechanical to electrical
d)
chemical to electrical
6.
The following reactions occurs in basic solution:
F2 + H2O -> O2 + F-
When the equation is balanced, the sum of the coefficients is:
F2 + H2O -> O2 + F-
When the equation is balanced, the sum of the coefficients is:
a)
11
b)
13
c)
12
d)
10
7.
Consider the following numbered processes:
1. A -> 2B
2. B -> C + D
3. E -> 2D
ΔH for the process A -> 2C + E is
1. A -> 2B
2. B -> C + D
3. E -> 2D
ΔH for the process A -> 2C + E is
a)
ΔH1 + ΔH2 + ΔH3
b)
ΔH1 + ΔH2
c)
ΔH1 + ΔH2 - ΔH3
d)
ΔH1 + 2ΔH2 - ΔH3
8.
Consider the following processes:
I. condensation of a liquid
II. increasing volume of an ideal gas at constant temp
III. dissolving sugar in water
IV. heating 1.0 mol of an ideal gas at constant volume
For how many of these is ΔS positive?
I. condensation of a liquid
II. increasing volume of an ideal gas at constant temp
III. dissolving sugar in water
IV. heating 1.0 mol of an ideal gas at constant volume
For how many of these is ΔS positive?
a)
0
b)
1
c)
2
d)
3
9.
For the reaction A + B 0> C + D, ΔHₒ = +40 kJ and ΔSₒ = +50 J/K. Therefore, the reaction under standard conditions is
a)
spontaneous at temps < 10K
b)
spontaneous at temps < 800K
c)
spontaneous at temps between 10K and 800K
d)
spontaneous at all temperatures
10.
Consider the reaction:
2SO2(g) <-> 2SO3(g)
for which ΔHₒ = -200. kJ and ΔSₒ =-187.1 J/K. Assuming that ΔHₒ and ΔSₒ are independent of temperature, calculate the temperature where Kp = 1.
2SO2(g) <-> 2SO3(g)
for which ΔHₒ = -200. kJ and ΔSₒ =-187.1 J/K. Assuming that ΔHₒ and ΔSₒ are independent of temperature, calculate the temperature where Kp = 1.
a)
969 K
b)
2069 K
c)
200. K
d)
1069 K
11.
The following questions refer to a galvanic cell that utilizes the following unbalanced reaction:
(AuCl4)-(aq) + Cu(s) -> Au(s) + Cl-(aq) + Cu2+(aq)
Determine the number of electrons transferred during the reaction.
(AuCl4)-(aq) + Cu(s) -> Au(s) + Cl-(aq) + Cu2+(aq)
Determine the number of electrons transferred during the reaction.
a)
2
b)
3
c)
4
d)
6
12.
Consider the reaction:
C2H5OH(l) + 3O2(g) -> 2CO2(g) + 3H2O(l), ΔH = -1.37 x 103kJ
When a 21.1g sample of ethyl alcohol (molar mass = 46.07 g/mol) is burned, how much energy is released as heat?
C2H5OH(l) + 3O2(g) -> 2CO2(g) + 3H2O(l), ΔH = -1.37 x 103kJ
When a 21.1g sample of ethyl alcohol (molar mass = 46.07 g/mol) is burned, how much energy is released as heat?
a)
0.627 kJ
b)
6.27 x 102 kJ
c)
2.89 x 104 kJ
d)
2.18 kJ
100 %
