Electrochemistry Essentials

What is electrochemistry?

• Electrochemistry is the study of the relationship between electricity and chemical reactions.

• Electrochemistry is the analysis of light and its interaction with matter.

• Electrochemistry focuses on the behavior of gases in chemical reactions.

• Electrochemistry is the study of sound waves and their effects on materials.

Define oxidation and reduction in electrochemical terms.

• Oxidation is the loss of electrons; reduction is the gain of electrons.

• Oxidation and reduction are both processes that involve the transfer of heat.

• Oxidation is the loss of neutrons; reduction is the gain of neutrons.

• Oxidation is the gain of protons; reduction is the loss of protons.

What is a galvanic cell and how does it work?

• A galvanic cell is a device that only stores energy without any chemical reactions.

• A galvanic cell converts electrical energy into chemical energy through non-spontaneous reactions.

• A galvanic cell is an electrochemical cell that generates electrical energy from spontaneous chemical reactions.

• A galvanic cell is a type of battery that requires an external power source to operate.

Explain the role of the salt bridge in a galvanic cell.

• The salt bridge maintains electrical neutrality and allows ion flow between half-cells in a galvanic cell.

• The salt bridge acts as a barrier to stop electron movement.

• The salt bridge prevents ion flow between half-cells.

• The salt bridge generates electricity in the galvanic cell.

What is the Nernst equation used for?

• To measure the concentration of a gas in a solution.

• To calculate the temperature of a chemical reaction.

• The Nernst equation is used to determine the cell potential of electrochemical cells under non-standard conditions.

• To determine the mass of a solid in a reaction.

Describe the difference between anode and cathode in electrochemical cells.

• The anode is where reduction occurs and the cathode is where oxidation occurs.

• The anode is always positive and the cathode is always negative.

• The anode is where oxidation occurs (loses electrons), and the cathode is where reduction occurs (gains electrons).

• Both anode and cathode are the same and perform identical functions.

What is the significance of standard electrode potential?

• It determines the temperature of a reaction.

• It measures the concentration of reactants in a solution.

• It indicates the color change during a reaction.

• It helps predict redox reaction feasibility and compare oxidizing/reducing agents.

How do concentration cells operate?

• Concentration cells generate voltage from the difference in ion concentration between two half-cells.

• Concentration cells function by mixing different solutions to create a reaction.

• Concentration cells require a physical barrier to separate the half-cells.

• Concentration cells operate by using a constant voltage source.

What is electrolysis and its applications?

• Electrolysis is primarily used for cooking food.

• Electrolysis is a method for generating electricity from solar power.

• Electrolysis is only applicable in the textile industry.

• Electrolysis is used in various applications including electroplating, water splitting for hydrogen production, purification of metals, and the production of chemical compounds like chlorine and sodium hydroxide.

Explain Faraday's laws of electrolysis.

• The mass of a substance is independent of the quantity of electricity passed.

• Faraday's laws of electrolysis consist of two laws: 1) The mass of a substance altered at an electrode is proportional to the quantity of electricity passed. 2) The mass of different substances altered by the same quantity of electricity is proportional to their equivalent weights.

• The laws of electrolysis only apply to metals and not to non-metals.

• The mass of a substance altered is inversely proportional to its equivalent weight.