Electrochemical Cells

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What is the maximum amount of electrical energy that can be obtained in a reversible chemical process?

Wmax
ΔG
nF
Welec (correct)

What is the primary function of an electrochemical cell?

To convert chemical energy into electrical energy or vice versa (correct)
To convert electrical energy into mechanical energy
To convert mechanical energy into thermal energy
To convert thermal energy into chemical energy

What is the relationship between the free energy change and the electrode potential?

ΔG = -nFE (correct)
ΔG = 1/-nFE
ΔG = 1/nFE
ΔG = nFE

What occurs at the anode in an electrochemical cell?

Oxidation of molecules, atoms, or ions (A) Signup and view all the answers

What is the unit of the Faraday constant?

C/mol (A) Signup and view all the answers

What is the charge of the cathode in an electrochemical cell?

Positive (+) (B) Signup and view all the answers

What is the energy available to do work in a spontaneous reaction?

-ΔG (B) Signup and view all the answers

What is the relationship between the maximum work available and the maximum amount of electrical energy that can be obtained?

Wmax = Welec (B) Signup and view all the answers

What type of reaction occurs at the cathode in an electrochemical cell?

Reduction reaction (A) Signup and view all the answers

What is the number of electrons involved in the reaction?

n (B) Signup and view all the answers

What is the term for the loss of electrons or an increase in oxidation state by a molecule, atom, or ion?

Oxidation (B) Signup and view all the answers

How many kinds of electrochemical cells are mentioned in the text?

Two (D) Signup and view all the answers

What is the formula for the EMF of a concentration cell?

Ecell = Ecell = 2.303RT log(C2) - log(C1) / nF (C) Signup and view all the answers

What is the reason for the absence of E0 in the Nernst equation of a concentration cell?

E0 gets cancelled out (B) Signup and view all the answers

What is the term for the potential of a single electrode?

Single electrode potential (C) Signup and view all the answers

What is the purpose of a calomel electrode in electrochemistry?

To measure the potential of an electrode (A) Signup and view all the answers

What is the characteristic of a galvanic cell?

The anode is negative and the cathode is positive (B) Signup and view all the answers

What is the purpose of an ion selective electrode?

To measure the concentration of a specific ion (B) Signup and view all the answers

What material is used in the positive electrode of a lithium-ion battery?

Lithium Manganese-oxide (D) Signup and view all the answers

What happens during the charging of a lithium-ion battery?

Lithium ions move from the positive to the negative electrode (A) Signup and view all the answers

What is the purpose of the separator in a lithium-ion battery?

To prevent the flow of lithium ions (B) Signup and view all the answers

What is the composition of the negative electrode in a lithium-ion battery?

Carbon (D) Signup and view all the answers

What is the function of the electrolyte in a lithium-ion battery?

To facilitate the flow of lithium ions (C) Signup and view all the answers

What is the advantage of lithium-ion batteries over pure lithium-based batteries?

They are more rechargeable (C) Signup and view all the answers

What is the rate at which a battery loses power over time called?

Shelf-discharge rate (C) Signup and view all the answers

What is a characteristic of modern batteries?

High energy density (D) Signup and view all the answers

What type of battery is more environmentally friendly than Ni-Cd batteries?

Nickel-metal hydride battery (B) Signup and view all the answers

What is a disadvantage of Ni-MH2 batteries?

They have a high self-discharge rate (A) Signup and view all the answers

What is a common feature of Nickel-metal hydride and Ni-Cd batteries?

Sealed assembly (A) Signup and view all the answers

What is the metal used in the assembly of Al-air batteries?

Aluminum (A) Signup and view all the answers