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Lesson 2: Commercial Batteries, Fuel Cells and Metal Corrosion — Picture questions (exam style)

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  • Questions count: 10
  • Passing grade: 60%
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1.
The table gives oxidation potentials of three elements. When W is coated once with Y and once with X, which option gives the correct type of protection?
The table gives oxidation potentials of three elements. When W is coated once with Y and once with X, which option gives the correct type of protection?
Y: anodic (barrier-only) protection, X: anodic (barrier-only) protection
Y: cathodic (sacrificial) protection, X: cathodic (sacrificial) protection
Y: anodic (barrier-only) protection, X: cathodic (sacrificial) protection
Y: cathodic (sacrificial) protection, X: anodic (barrier-only) protection
2.
Which statement about the cells shown is NOT correct?
Which statement about the cells shown is NOT correct?
the H₂/O₂ fuel cell produces CO₂
in the lead–acid cell the acid concentration falls on discharge
a fuel cell converts chemical to electrical energy without combustion
zinc is the anode of the dry cell
3.
An iron sheet coated with Cu is scratched so the iron is exposed (see diagram) is left in moist air. What happens?
An iron sheet coated with Cu is scratched so the iron is exposed (see diagram) is left in moist air. What happens?
iron and Cu corrode at the same rate
iron does not rust; the coating keeps out water and oxygen
iron rusts faster because it becomes the anode relative to Cu
iron does not rust because Cu is oxidised instead (sacrificial protection)
4.
A dry cell delivers 1 A for 2 h. What mass of Zn is used at the anode? (Zn = 65, F = 96 500 C)
A dry cell delivers 1 A for 2 h. What mass of Zn is used at the anode? (Zn = 65, F = 96 500 C)
0.0404 g
6.74×10−4 g
4.85 g
2.42 g
5.
Which statement about the cells shown is NOT correct?
Which statement about the cells shown is NOT correct?
in the lead–acid cell the acid concentration falls on discharge
the dry cell is rechargeable
the lithium-ion cell is rechargeable
zinc is the anode of the dry cell
6.
Which statement about the cells shown is NOT correct?
Which statement about the cells shown is NOT correct?
zinc is the anode of the dry cell
a fuel cell converts chemical to electrical energy without combustion
acid concentration rises during discharge
the lithium-ion cell is rechargeable
7.
Which statement about the cells shown is correct?
Which statement about the cells shown is correct?
the lithium-ion cell is rechargeable
the dry cell is rechargeable
the H₂/O₂ fuel cell produces CO₂
PbO₂ is the anode during discharge
8.
A lead–acid cell delivers 2 A for 5 h. What mass of Pb is used at the anode? (Pb = 207, F = 96 500 C)
A lead–acid cell delivers 2 A for 5 h. What mass of Pb is used at the anode? (Pb = 207, F = 96 500 C)
0.644 g
38.6 g
77.2 g
0.0107 g
9.
Which statement about the cells shown is NOT correct?
Which statement about the cells shown is NOT correct?
the lithium-ion cell is rechargeable
in the lead–acid cell the acid concentration falls on discharge
PbO₂ is the anode during discharge
zinc is the anode of the dry cell
10.
Which statement about the cells shown is correct?
Which statement about the cells shown is correct?
acid concentration rises during discharge
zinc is the anode of the dry cell
the dry cell is rechargeable
the H₂/O₂ fuel cell produces CO₂
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