Chemistry Test Electrochemistry

Question 1

What is the standard reduction potential of the standard hydrogen electrode (SHE)?

Accepted Answer

0.00 V

Answer

The SHE is defined as having a standard reduction potential of exactly 0.00 V and serves as the reference point for all other electrode potentials.

Question 2

In a galvanic cell, oxidation occurs at which electrode?

Accepted Answer

Anode

Answer

In a galvanic (voltaic) cell, the anode is where oxidation (loss of electrons) occurs, while reduction occurs at the cathode.

Question 3

Which equation relates the Gibbs free energy change to cell potential?

Accepted Answer

ΔG = -nFE

Answer

The relationship ΔG = -nFE shows that a positive cell potential (E) corresponds to a negative ΔG, indicating a spontaneous reaction.

Question 4

Faraday's constant (F) represents which quantity?

Accepted Answer

Charge of one mole of electrons

Answer

Faraday's constant (~96,485 C/mol) is the total electric charge carried by one mole of electrons.

Question 5

The Nernst equation is used to calculate cell potential under which conditions?

Accepted Answer

Non-standard conditions

Answer

The Nernst equation (E = E° - (RT/nF)ln Q) adjusts the standard cell potential for non-standard concentrations and conditions.

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