Lesson 3.1.11.2
3.1.11.2 Commercial applications of electrochemical cells Quiz: AQA Chemistry, Unit 1
20 questions
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Lesson 3.1.11.2, Commercial applications of electrochemical cells: 20 multiple choice questions for the AQA Chemistry (7405), Unit 1: Physical chemistry, written with Revision Ninja.
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The 20 questions
-
In a lithium cell, what is the negative electrode reaction?
- Li+ + CoO2 + e- -> Li+[CoO2]-
- CoO2 -> Co + O2
- Li+ + e- -> Li
- Li -> Li+ + e-
-
In a lithium cell, what is the positive electrode reaction?
- Li -> Li+ + e-
- Li+ + CoO2 + e- -> Li+[CoO2]-
- Li+[CoO2]- -> Li+ + CoO2 + e-
- 2Li+ + 2e- -> 2Li
-
What is the overall reaction in a lithium cell from the two electrode reactions?
- Li -> Li+ + CoO2
- Li + CoO2 -> Li+[CoO2]-
- Li+ + CoO2 -> Li+[CoO2]-
- Li + 2CoO2 -> Li+[CoO2]-
-
Which electrochemical device generates electricity continuously without needing electrical recharging?
- Fuel cell
- Lithium-ion cell
- Primary cell
- Dry cell
-
In an alkaline hydrogen-oxygen fuel cell, what is the electrode reaction at the negative electrode?
- O2 + 2H2O + 4e- -> 4OH-
- H2 + 2OH- -> 2H2O + 2e-
- H2 + 2e- -> 2H-
- 2H2O + 2e- -> H2 + 2OH-
-
What product is formed at the positive electrode of an alkaline hydrogen-oxygen fuel cell?
- Hydroxide ions
- Water molecules
- Hydrogen gas
- Oxygen gas
-
What is the overall reaction of the alkaline hydrogen-oxygen fuel cell?
- 2H2 + 2O2 -> 2H2O2
- H2 + O2 -> H2O2
- H2 + O2 -> 2OH-
- 2H2 + O2 -> 2H2O
-
Which product is the only one formed in the overall reaction of a hydrogen-oxygen fuel cell?
- Water
- Hydrogen peroxide
- Carbon dioxide
- Hydrogen chloride
-
Why can non-rechargeable primary cells not be recharged using electrical current?
- High resistance
- Reversible reactions
- Volatile electrolyte
- Irreversible reactions
-
How are rechargeable cells restored to their original chemical state?
- Replacing electrolyte
- Applying external current
- Adding fresh fuel
- Heating the cell
-
Using data given for an alkaline hydrogen-oxygen fuel cell, E(O2/OH-) = +0.40 V and E(H2O/H2, alkaline) = -0.83 V, what is the EMF of the cell?
- +1.23 V
- +0.83 V
- -1.23 V
- +0.43 V
-
What is a major benefit of using hydrogen fuel cells in vehicles?
- Zero cost fuel
- Infinite lifespan
- No safety risks
- No carbon emissions
-
Which environmental hazard is associated with improper disposal of commercial lithium cells?
- Radioactive waste
- Toxic metal pollution
- Acid rain
- Ozone depletion
-
In a lithium cell, what is the oxidation state change of lithium at the negative electrode?
- From +2 to +1
- From 0 to -1
- From +1 to 0
- From 0 to +1
-
What is the function of the electrolyte inside an electrochemical cell?
- Allows ion transport
- Conducts external current
- Prevents ion movement
- Allows electron transport
-
Where do electrons travel to create a current when a cell operates?
- Through external circuit
- Through electrolyte solution
- Between internal ions
- Across salt bridge
-
What is the only waste product formed during the operation of a hydrogen fuel cell?
- Carbon dioxide
- Nitrogen monoxide
- Hydrogen peroxide
- Water
-
Which process occurs at the negative electrode in an alkaline hydrogen-oxygen fuel cell?
- Oxygen oxidation
- Hydrogen reduction
- Hydrogen oxidation
- Oxygen reduction
-
What allows a rechargeable cell to be reused multiple times?
- Reversible electrode reactions
- Zero internal resistance
- Infinite electron capacity
- Irreversible electrode reactions
-
Which process occurs at the positive electrode of an alkaline hydrogen-oxygen fuel cell?
- Oxygen oxidation
- Hydrogen oxidation
- Hydrogen reduction
- Oxygen reduction
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