Metal Air Cell Concepts

The video tutorial explains metal air cells, a type of portable energy source with a metal anode, alkaline electrolyte paste, and a porous cathode membrane. It covers the reduction potentials and reactions occurring in the cell, focusing on zinc as the anode. The tutorial details the chemical reactions, including the formation of zinc oxide and electron flow, and explains how to calculate the cell potential. It also discusses the migration of hydroxide ions within the cell, emphasizing the energy production process.

What is the role of the metal anode in a metal air cell?

• It maintains the pH level.

• It absorbs oxygen from the air.

• It is the source of electrons.

• It acts as the positive terminal.

What is the significance of the porous cathode membrane?

• It allows oxygen to seep in.

• It prevents oxygen from entering.

• It maintains the cell's temperature.

• It blocks the flow of electrons.

What is the pH condition of the electrolyte paste in a metal air cell?

• Neutral

• Acidic

• Basic

• Variable

What does a positive reduction potential indicate about a reaction?

• The reaction has a high pH.

• The reaction is non-spontaneous.

• The reaction favors electron gain.

• The reaction releases energy.

In the zinc air cell, what is produced at the cathode?

• Electrons

• Zinc oxide

• Hydroxide ions

• Water

What happens to the hydroxide ions produced at the cathode?

• They are converted to water.

• They are used up at the anode.

• They remain at the cathode.

• They are released into the air.

What is formed when zinc reacts with hydroxide ions?

• Zinc hydroxide

• Zinc oxide

• Zinc chloride

• Zinc sulfate

How is the cell potential for a zinc air cell calculated?

• By multiplying the potentials of both reactions.

• By dividing the cathode potential by the anode potential.

• By adding the reduction potentials of both reactions.

• By subtracting the anode potential from the cathode potential.

Why is the voltage not affected by the number of reactions occurring?

• Voltage is only affected by temperature.

• Voltage is a measure of total energy.

• Voltage is independent of energy.

• Voltage is potential energy per unit charge.

What is the direction of hydroxide ion migration in a metal air cell?

• From air to electrolyte

• From electrolyte to air

• From cathode to anode

• From anode to cathode