Chemistry Test Electrochemistry 2

Question 1

What is electrolysis?

Accepted Answer

Using electrical energy to drive a non-spontaneous reaction

Answer

Electrolysis uses electrical energy to drive a non-spontaneous chemical reaction, the reverse of what occurs in a galvanic cell.

Question 2

In an electrolytic cell, which electrode is connected to the positive terminal of the power source?

Accepted Answer

Anode

Answer

The anode in an electrolytic cell is connected to the positive terminal, attracting anions and where oxidation occurs.

Question 3

How many grams of silver (Ag, molar mass = 108 g/mol) are deposited by 96,485 coulombs during electrolysis of AgNO₃?

Accepted Answer

108 g

Answer

One mole of electrons (96,485 C) reduces one mole of Ag⁺ (since Ag⁺ + e⁻ → Ag), depositing 108 g of silver.

Question 4

Which type of cell converts chemical energy directly into electrical energy?

Accepted Answer

Galvanic (voltaic) cell

Answer

A galvanic (voltaic) cell uses spontaneous redox reactions to convert chemical energy directly into electrical energy.

Question 5

What does a positive standard cell potential (E°cell > 0) indicate?

Accepted Answer

Spontaneous reaction

Answer

A positive E°cell means ΔG° is negative, indicating the redox reaction is spontaneous under standard conditions.

Chemistry Practice Test