WorksheetsChemistry Unit 9 Review
Total questions: 40
Worksheet time: 2hrs 44mins
What is the oxidation number for Br in the compound KBr?
+5
+3
+1
-1
What is the oxidation number for Br in the compound KBrO3?
+5
+3
+1
-1
What is the oxidation number for Br in the compound KBrO?
+5
+3
+1
-1
What is the oxidation number for Br in the compound KBrO2?
+5
+3
+1
-1
What is the oxidation number for S in the compound K2SO4?
+6
+4
+2
-2
What is the oxidation number for S in the compound SO3?
+6
+4
+2
-2
What is the oxidation number for S in the compound K2S2O3?
+6
+4
+2
-2
What is the oxidation number for S in the compound CS2?
+6
+4
+2
-2
What is the oxidation number for C in the compound C3H8?
-4
-2.67
-1.33
0
What is the oxidation number for C in the compound C10H8?
-2.67
-1.25
-0.80
0
Ca(s) + H2O(l) --> H2(g) + Ca(OH)2(aq)
In this chemical equation, the oxidized substance is _____ and the reduced substance is _____.
Ca(s); O in H2O(l)
O in H2O(l); Ca(s)
Ca(s); H in H2O(l)
H in H2O(l); Ca(s)
Chose the correct set of balancing coefficients for the chemical equation in question #11 (Ca(s) + H2O(l) --> H2(g) + Ca(OH)2(aq))
2, 1, 1, 2
1, 2, 2, 1
1, 2, 1, 1
1, 1, 2, 2
In this chemical equation, the oxidized substance is _____ and the reduced substance is _____.
CaC2(s) + H2O(l) --> C2H2(g) + Ca(OH)2(aq)
Ca(s); O in H2O(l)
C; Ca(s)
Ca(s); C
There is no oxidation & reduction here
Chose the correct set of balancing coefficients for the chemical equation in question #13 (CaC2(s) + H2O(l) --> C2H2(g) + Ca(OH)2(aq))
2, 1, 1, 2
1, 2, 2, 1
1, 2, 1, 1
1, 1, 2, 2
In this chemical equation, the oxidized substance is _____ and the reduced substance is _____.
Na2S(aq) + Mg(NO3)2(aq) --> MgS(s) + NaNO3(aq)
Na+ ; Mg2+
N ; Mg2+
S2- ; N
There is no oxidation & reduction here
Chose the correct set of balancing coefficients for the chemical equation in question #15 (Na2S(aq) + Mg(NO3)2(aq) --> MgS(s) + NaNO3(aq))
2, 1, 1, 1
1, 2, 1, 1
1, 1, 2, 1
1, 1, 1, 2
Choose the pair below that will react with each other
Cu2+ and Mg2+
Pb2+ and Mg
Zn and Sn
Fe and Zn2+
Choose the pair below that will react with each other
Cu2+ and Sn
Pb2+ and Ag
Ni and Al3+
Fe and Zn2+
Choose the pair below that will react with each other
H2 and Zn
Au and Ag+
Mg and H+
Pb and Zn2+
One of the chemical equations below is a correct representation of an oxidation-reduction reaction. The other two are not. Choose the correct one.
Zn2+(aq) + Pb(s) --> Pb2+(aq) + Zn(s)
Zn2+(aq) + Pb2+(aq) --> Pb2+(aq) + Zn2+(aq)
Pb2+(aq) + Zn(s) --> Zn2+(aq) + Pb(s)
None of these are correct
One of the chemical equations below is a correct representation of an oxidation-reduction reaction. The other two are not. Choose the correct one.
2Ag+(aq) + Pb(s) --> Pb2+(aq) + 2Ag(s)
2Ag+(aq) + Pb2+(aq) --> Pb2+(aq) + 2Ag+(aq)
Pb2+(aq) + 2Ag(s) --> 2Ag+(aq) + Pb(s)
None of these are correct
One of the chemical equations below is a correct representation of an oxidation-reduction reaction. The other two are not. Choose the correct one.
Ni2+(aq) + Sn(s) --> Sn2+(aq) + Ni(s)
Ni2+(aq) + Sn2+(aq) --> Ni(s) + Sn4+(aq)
Ni2+(aq) + Sn(s) --> Sn2+(aq) + Ni(s)
None of these are correct
Choose the correct value of the cell potential (voltage), in volts, for a copper/zinc cell.
-0.42 V
+0.42 V
-1.10 V
+1.10 V
Choose the correct value of the cell potential (voltage), in volts, for a silver/lithium cell.
+3.85 V
-3.85 V
+2.25 V
-2.25 V
Choose the correct value of the cell potential (voltage), in volts, for a magnesium/H2SO4 cell.
-3.37 V
-2.37 V
+2.27 V
+3.37 V
If a small lamp is illuminated with a 9.00 V battery and the lamp draws 250. mA of current, the power of the circuit is (a) watts.
If the circuit in question 25 (9.00 V battery and the lamp draws 250. mA of current) runs for 5.00 minutes, the energy consumed by the circuit is (a) joules.
The light bulb in question 25 was an incandescent bulb. Most of the energy released by the bulb was in the form of
heat
heat and light
light
heat, light, and voltage
If a LED was wired to a 9.00 V battery and a 500-ohm resistor, and if the LED operated for 5.00 minutes, the power of this circuit would be _________ the power of the circuit in question 26.
higher than
lower than
the same as
first higher than, then lower than
The energy consumed by the circuit in question 29 (LED was wired to a 9.00 V battery and a 500-ohm resistor, and if the LED operated for 5.00 minutes) will be _________ the energy consumed by the circuit in question 26
higher than
lower than
the same as
first higher than, then lower then
The LED in question 29 released most of the energy in the form of
heat
heat and light
light
heat, light, and voltage
The heat of combustion of methane (natural gas) is 891 kJ/mole. The burning of 10.0 g of methane will release (a) kJ.
If we used the amount of energy from question 32 (557 kJ) to power a 75 watt circuit (like a group of light bulbs), the circuit would run for ____________ .
roughly 30 minutes
roughly 1 hour
roughly 2 hours
roughly 4 hours
Electric utilities charge their customers by the kilowatt-hour. (a) kJ is the equivalent of one kilowatt-hour.
The heat of combustion of methane (CH4) is 891 kJ/mole. (a) grams of methane must be burned to release an amount of energy that is equivalent to one kilowatt-hour.
The four principal parts of an electrochemical cell are these:
Anode, cathode, electrolyte, container
Anode, cathode, container, external wire
Anode, cathode, electrolyte, external wire
Anode, cathode, external wire, voltmeter
The electrolyte does what job in an electrochemical cell?
Keeps the overall cell electrically neutral
Provides a path for the electron transfer
Provides a location for the oxidation and reduction to occur
All of the above
What happens at the cathode in an electrochemical cell?
Oxidation
Reduction
Both oxidation and reduction
Neither oxidation nor reduction
Choose the statement that is the best comparison of electrochemical cells and batteries
Electrochemical cells involve only oxidation or reduction; batteries involve both.
Batteries can provide power to circuits; electrochemical cells can't.
Electrochemical cells are made of liquids; batteries are made of solids.
A battery is made of one or more electrochemical cells.
Choose the most accurate statement about batteries.
A battery's voltage is fixed until it dies, but the current it produces will vary.
A battery will produce a constant current until it dies, but its voltage will vary.
A battery will produce a constant level of power but not a constant level of voltage.
Any battery is rechargeable.
