Chapter 4: 4.3 Electrolysis and Electrolytic Cells Flashcards

1
Q

Define:

Electrolysis

A

A nonspontaneous chemical reaction is forced to occur by the application of electrical energy

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2
Q

True or False:

A redox reaction that has a negative ΔG (positive E(cell)) will not occur spontaneously

A

False, it will occur spontaneously

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3
Q

True or False:

A redox reaction that has a positive ΔG (negative E(cell)) will not occur spontaneously

A

True

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4
Q

Where is electrolysis carried out in?

A

Electrolytic cell

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5
Q

What is the minimum standard voltage required to force a nonspontaneous redox reaction to occur?

A

E(electrolysis) = -E(cell)

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6
Q

Define:

Overpotential

A

The minimum aplied voltage necessary to force a nonspontaneous reaction has to be greater than the E(electrolysis)

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7
Q

True or False:

The overpotential is not negligible

A

True, it has a major significance in industrial application

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8
Q

What factors must be considered to determine the species that will be formed?

A
  • Overpotential
  • Non-standard concentrations
  • Temperature
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9
Q

True or False:

Most favourable species will be formed

A

True

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10
Q

What are the products of the Chloro-Alkali Process?

A
  • Chlorine gas
  • Hydrogen gas
  • Sodium hydroxide/lye
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11
Q

Define:

Faraday’s Law

A

The number of moles of products reduced or oxidized by the passage of an electric current through an electrolytic cell is stoichiometrically equivalent to the number of moles of electrons supplied

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12
Q

Using the Faraday constant, how can the absolute charge (Q) of n moles be calculated?

A

Q = n(e)F

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13
Q

How is the equation for electric charge usually written (in terms of current and time)?

A

Q = It

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