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WorksheetsRechargeable Cells
Total questions: 12
Worksheet time: 8mins
A primary cell is a cell that...
can only be used once
can be recharged and used again
is reusable
is used again and again
What is the equation at the anode for the discharge of a nickel cadmium cell?
2NiO(OH) (s) + 2H2O (l) + 2e- → 2NiOH2 (s) + 2OH-
Cd(s) + 2OH-(aq) → Cd(OH)2 + 2e-
Cd(s) + 2H2O (l) → Cd(OH)(aq) + H2 (g)
NiO(OH) (s) + 2OH-(aq) → Ni(OH)2 + 2e- + H2O (l)
Which of the following is an advantage of lithium ion cells?
High energy density and high discharge rates
Charge quickly and have a high number of cycles
High energy density and low discharge rate
Cheap to make
What is the equation at the cathode for the discharging of a methanol fuel cell?
CH3OH + H2O → CO2 + 6H+ + 6e-
6H+ + 3/2O2 + 6e- → 3H2O
CH3OH + 3/2O2 → CO2 + 2H2O
CH3OH + O2 → CO2 + 2H2O
What is a disadvantage of a lead acid battery?
They are expensive to manufacture.
They have a high self discharge rate.
They pose an explosion risk when overcharged.
Lead is a plastic that is harmful for the environment.
Lithium ions react with compounds of which of the following metal in a lithium ion cell...
Copper
Chromium
Zinc
Cobalt
What is the equation at the cathode for the discharge of an alkali fuel cell?
4OH- → 2H2O + O2 + 4e-
2H2O + O2 + 4e- → 4OH-
2H2O + O2 + 2e- → 4OH-
4OH- + 4H+ → 4H2O
The Ecell of a Daniell cell at 298K is 1.1V. The concentration of copper ions is 0.1M, and zinc ions is 0.2M. What is the E cell (to 4 significant figures)?
1.109 V
1.112 V
1.091 V
1.110 V
In an electrolytic cell between magnesium and zinc, which of the following will increase the Ecell?
Increasing concentration of solid magnesium (whilst keeping all other concentrations the same).
Increasing concentration of zinc ions getting oxidised (whilst keeping all other concentrations the same).
Increasing concentration of magnesium ions (whilst keeping all other concentrations the same).
Decreasing the temperature.
Which of the following is a disadvantage of a hydrogen fuel cell?
Toxic waste is produced.
Fuel cells are less efficient.
Fuel cells make countries more dependent on crude oil.
There is a lack of infrastructure to facilitate their use.
The enthalpy change of formation of water is -286 kJ mol-1 and has an energy change of -237 kJ mol-1. What is the thermodynamic efficiency of water?
82.9%
12.1%
67.7%
120.7%
What is a disadvantage of using a nickel cadmium battery?
Expensive to produce.
Known to cause electrical fires.
Harmful to the environment after it is disposed.
Overcharging leads to production of hydrogen gas, which can explode.
