Electrochemistry Energy Changes

What is an electrochemical cell?

• An electrochemical cell is used to store mechanical energy.

• An electrochemical cell is a type of solar panel.

• An electrochemical cell is a device that converts sound waves into electricity.

• An electrochemical cell is a device that generates electrical energy through chemical reactions.

Explain the difference between galvanic cells and electrolytic cells.

• Galvanic cells and electrolytic cells both produce electricity from chemical reactions.

• Galvanic cells and electrolytic cells both use electricity to drive chemical reactions.

• Galvanic cells produce electricity from chemical reactions, while electrolytic cells use electricity to drive chemical reactions.

• Galvanic cells use electricity to drive chemical reactions, while electrolytic cells produce electricity from chemical reactions.

Describe the role of anode and cathode in an electrochemical cell.

• The anode is where oxidation occurs, and the cathode is where reduction occurs in an electrochemical cell.

• Both the anode and cathode are where oxidation occurs in an electrochemical cell.

• The anode is where reduction occurs, and the cathode is where oxidation occurs in an electrochemical cell.

• The anode and cathode have no specific roles in an electrochemical cell.

What is the standard electrode potential?

• E*

• E^

• E°

• E

How is cell potential related to Gibbs free energy change?

• ΔG = -nFΔE

• ΔG = -nFΔE + RT

• ΔG = nFΔE

• ΔG = -nFΔE + PV

Discuss the concept of cell potential and its measurement.

• Cell potential can only be positive.

• Cell potential is measured using a voltmeter, and it represents the potential difference between two half-cells in an electrochemical cell.

• Cell potential is the same for all types of electrochemical cells.

• Cell potential is measured using a thermometer.

Explain the terms oxidation and reduction in electrochemistry.

• Oxidation is the gain of electrons, while reduction is the loss of electrons in electrochemistry.

• Oxidation is the process of reducing the oxidation state, while reduction is the process of increasing the oxidation state in electrochemistry.

• Oxidation is the loss of electrons or an increase in oxidation state, while reduction is the gain of electrons or a decrease in oxidation state in electrochemistry.

• Oxidation is the increase in oxidation state, while reduction is the decrease in oxidation state in electrochemistry.

What is the Nernst equation and how is it used in electrochemistry?

• The Nernst equation is used to measure the weight of ions in electrochemistry.

• The Nernst equation is used to calculate the equilibrium potential of an electrochemical cell by considering the standard electrode potential, temperature, and ion concentrations.

• The Nernst equation is used to calculate the speed of chemical reactions in electrochemistry.

• The Nernst equation is used to determine the color change of electrodes in electrochemistry.

Discuss the significance of salt bridge in an electrochemical cell.

• The salt bridge is used to store excess energy in the cell

• The salt bridge maintains electrical neutrality and allows the flow of ions between the two half-cells in an electrochemical cell.

• The salt bridge prevents the flow of electrons in the cell

• The salt bridge enhances the voltage output of the cell

How does the concentration of ions affect cell potential?

• The concentration of ions has no impact on cell potential

• Cell potential is solely determined by temperature, not ion concentration

• Higher ion concentration always leads to higher cell potential

• The concentration of ions can impact cell potential by altering the reaction equilibrium.