IB Chem Topic 9

What is the definition of a redox reaction?

• A redox reaction is a reaction that occurs only in acidic solutions.

• A redox reaction is a transfer of electrons between two species.

• A redox reaction is a reaction that involves the transfer of protons between two species.

• A redox reaction is a chemical reaction that involves the formation of a new substance.

What is the difference between oxidation and reduction?

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

• Oxidation and reduction have no relation to electron transfer.

• Oxidation and reduction are the same process.

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

What is the purpose of a salt bridge in an electrochemical cell?

• To maintain electrical neutrality

• To increase the voltage of the cell

• To prevent the flow of electrons

• To generate heat in the cell

What is the standard electrode potential?

• The standard electrode potential is the measure of the tendency of an electrode to gain or lose electrons compared to a standard oxygen electrode.

• The standard electrode potential is the measure of the tendency of an electrode to gain or lose protons compared to a standard hydrogen electrode.

• The standard electrode potential is the measure of the tendency of an electrode to gain or lose neutrons compared to a standard hydrogen electrode.

• The standard electrode potential is the measure of the tendency of an electrode to lose or gain electrons compared to a standard hydrogen electrode.

What is the Nernst equation used for?

• The Nernst equation is used to measure the pH of a solution.

• The Nernst equation is used to determine the concentration of a solute in a solution.

• The Nernst equation is used to calculate the rate of a chemical reaction.

• The Nernst equation is used to calculate the equilibrium potential of an ion across a membrane.

What is the half-cell reaction for the reduction of hydrogen ions to hydrogen gas?

• H+ + e- -> H

• 2H+ + 2e- -> H2

• H+ + 2e- -> H2

• H+ + 2e- -> 2H

What is the oxidation state of an element in its elemental form?

• -1

• 2

• 0

• +1

What is the relationship between the standard electrode potential and the spontaneity of a redox reaction?

• The standard electrode potential determines the rate of a redox reaction.

• The more positive the standard electrode potential, the more spontaneous the redox reaction.

• The standard electrode potential has no effect on the spontaneity of a redox reaction.

• The more negative the standard electrode potential, the more spontaneous the redox reaction.

What is the purpose of a reference electrode in electrochemistry?

• To provide a source of electrical current for the electrochemical reaction.

• To measure the concentration of ions in the solution.

• To prevent the working electrode from corroding.

• To provide a stable and known potential against which the potential of the working electrode can be measured.

What is the difference between a galvanic cell and an electrolytic cell?

• A galvanic cell and an electrolytic cell are the same thing.

• A galvanic cell and an electrolytic cell both convert chemical energy into electrical energy.

• A galvanic cell converts chemical energy into electrical energy, while an electrolytic cell uses electrical energy to drive a non-spontaneous redox reaction.

• A galvanic cell uses electrical energy to drive a spontaneous redox reaction, while an electrolytic cell converts chemical energy into electrical energy.