Batteries and Fuel Cells
Chemistry ⇒ Redox Reactions and Electrochemistry
Batteries and Fuel Cells starts at 12 and continues till grade 12.
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A Daniell cell is constructed using Zn and Cu electrodes. If the concentration of Zn2+ is increased, what happens to the cell potential?
A fuel cell is operating with hydrogen and oxygen gases at 25°C. If the partial pressure of H2 is increased, what is the effect on the cell voltage?
Describe one advantage and one disadvantage of lithium-ion batteries.
Describe the main difference between a battery and a fuel cell.
Describe the role of the separator in a battery.
Explain the term 'memory effect' in the context of batteries.
A certain battery is constructed using the following half-cells at 25°C:
Half-cell 1: Fe2+(aq) + 2e− → Fe(s), E° = −0.44 V
Half-cell 2: Ag+(aq) + e− → Ag(s), E° = +0.80 V
Calculate the standard cell potential (E°cell) for this battery and identify which metal acts as the anode.
A nickel-metal hydride (NiMH) battery is being considered for use in a hybrid vehicle. Discuss two advantages and one disadvantage of using NiMH batteries in this application.
Which of the following batteries is commonly used in mobile phones? (1) Lead-acid battery (2) Nickel-cadmium battery (3) Lithium-ion battery (4) Mercury cell
Which of the following is a correct representation of a galvanic cell? (1) Anode | Electrolyte || Electrolyte | Cathode (2) Cathode | Electrolyte || Electrolyte | Anode (3) Anode | Cathode || Electrolyte | Electrolyte (4) Electrolyte | Anode || Cathode | Electrolyte
Which of the following is a correct statement about the function of the salt bridge in a galvanic cell? (1) It completes the circuit by allowing ion flow (2) It supplies electrons to the cell (3) It acts as the anode (4) It prevents oxidation
Which of the following is a correct statement about the operation of a lead-acid battery during discharge? (1) Both electrodes are converted to PbSO4 (2) The electrolyte becomes more concentrated (3) Water is consumed (4) Lead is oxidized to PbO2
Fill in the blank: In a galvanic cell, electrons flow from the _______ to the _______.
Fill in the blank: The electrolyte used in a typical alkaline battery is _______.
Fill in the blank: The main function of the salt bridge in a galvanic cell is to maintain _______ neutrality.
Fill in the blank: The main product formed at the cathode in a hydrogen-oxygen fuel cell is _______.
A hydrogen-oxygen fuel cell produces water as a product. True or False?
True or False: In a fuel cell, the electrodes are consumed during the operation of the cell.
True or False: In a fuel cell, the reactants are continuously supplied from an external source.
True or False: In a galvanic cell, oxidation occurs at the cathode.
