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Electrochemistry: Cell Potential Prediction Quiz

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Electrochemistry: Cell Potential Prediction Quiz

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Questions and Answers

In the context of electrolysis, according to Faraday's first law, what is the relationship between the mass of substance deposited or liberated and the amount of charge passed?

Inversely proportional

No relationship

Exponential relationship

Directly proportional (correct)

What does the term 'electrochemical equivalent' refer to in the context of electrolysis?

Time taken for deposition

Molar mass of the substance

Mass of substance deposited per unit charge passed (correct)

Amount of charge passed

When a solution of Ag is electrolyzed with a current of 1.5 amperes, what is the equivalent weight of Ag if 10g of copper is deposited at the cathode in 20 minutes?

$0.5 \text{ g}$

$0.2938 \text{ g}$ (correct)

$0.15 \text{ g}$

$0.1 \text{ g}$

What is the mass of nickel that will be deposited at the cathode if a current of 5.0 amperes is passed through a Ni solution for 20 minutes?

$63.15 \text{ g}$ Signup and view all the answers

What does Gibbs free energy represent in the context of electrochemical reactions?

Energy available to do non-expansion work Signup and view all the answers

How is Gibbs free energy related to the spontaneity of a chemical reaction?

Zero Gibbs free energy indicates an equilibrium reaction. Signup and view all the answers

What is the significance of Faraday's second law of electrolysis?

It establishes the concept of equivalent weight. Signup and view all the answers

How can one calculate the electrochemical equivalent of a substance?

$\text{Equivalent weight} \div \text{Molar mass}$ Signup and view all the answers

What is the role of Faraday's constant in electrolysis calculations?

$\text{Amount of charge passed} = \text{Current} \times \text{Time} \times \text{Faraday's constant}$ Signup and view all the answers