Exploring Electrochemistry Concepts

What is an electrochemical cell?

• An electrochemical cell is a device that converts chemical energy into electrical energy or vice versa.

• A device that only stores electrical energy.

• A type of battery that cannot be recharged.

• A machine that generates heat from chemical reactions.

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

• To prevent the flow of electrons

• To act as a catalyst for the reaction

• To increase the voltage of the cell

• The function of a salt bridge in a galvanic cell is to maintain electrical neutrality and allow ion flow between the half-cells.

What is the Nernst equation used for?

• To measure the pH of a solution.

• To determine the temperature of a chemical reaction.

• To calculate the mass of reactants in a reaction.

• The Nernst equation is used to calculate the electric potential of an electrochemical cell based on ion concentrations.

How does temperature affect the cell potential in electrochemical cells?

• Higher temperatures always decrease cell potential.

• Temperature has no effect on cell potential.

• Temperature affects cell potential by altering reaction rates and equilibrium constants, influencing the overall voltage output.

• Temperature only affects the physical size of the cell.

Define electrolysis and its applications.

• Electrolysis is primarily used for cooking food.

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

• Electrolysis is only applicable in the textile industry.

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

What is the role of the anode in an electrochemical cell?

• The anode is the electrode that generates heat during the reaction.

• The anode is the electrode where oxidation occurs and electrons are released.

• The anode is the part of the cell that stores energy for later use.

• The anode is where reduction occurs and electrons are absorbed.

Describe the process of corrosion and its effects.

• Corrosion only affects non-metal materials like plastics.

• Corrosion is the deterioration of materials, especially metals, due to chemical reactions with their environment, leading to structural damage and material loss.

• Corrosion is a method of enhancing the durability of metals.

• Corrosion is a process that strengthens metals against wear.

List two methods to prevent corrosion.

• Use regular steel materials

• Expose metals to moisture

• Apply heat to metal surfaces

• 1. Apply protective coatings, 2. Use corrosion-resistant materials

What is the difference between galvanic and electrolytic cells?

• Galvanic cells require electricity to operate; electrolytic cells generate electricity from spontaneous reactions.

• Galvanic cells generate electricity from spontaneous reactions; electrolytic cells require electricity to drive non-spontaneous reactions.

• Galvanic cells are used in batteries; electrolytic cells are used in light bulbs.

• Galvanic cells can only operate in acidic solutions; electrolytic cells can only operate in basic solutions.

How is the standard electrode potential measured?

• The standard electrode potential is measured using a galvanic cell with a standard hydrogen electrode.

• By measuring the temperature of the solution

• Using a voltmeter directly on the electrode

• Through a spectroscopic analysis of the electrode