Electrochemistry and Kinetics Quiz

Which statement correctly describes a galvanic cell?

• It requires external electricity to operate

• It converts electrical energy to chemical energy

• It generates electricity from a spontaneous redox reaction

• It uses identical electrodes in both half-cells

What is the main function of the salt bridge in a voltaic cell?

• To increase voltage

• To prevent electron flow

• To maintain electrical neutrality

• To supply ions for redox reactions

Which of the following is reduced in the electrolysis of aqueous CuSO₄ using carbon electrodes?

• SO₄²⁻

• Cu²⁺

• OH⁻

• H⁺

How is the spontaneity of a redox reaction predicted?

• By the type of electrodes

• By salt bridge movement

• By comparing reduction potentials

• By measuring current flow

Which condition favors the discharge of H⁺ over Na⁺ in electrolysis?

• H⁺ has a lower concentration

• Na⁺ is more reactive

• Cathode is inert

• Temperature is high

Why is Cu a better electrode for redox reactions than Zn?

• It is heavier

• It has a higher melting point

• It has a higher standard reduction potential

• It is more reactive

What is the role of an inert electrode?

• It participates in redox reactions

• It transfers ions

• It provides surface for redox without reacting

• It conducts electrons and ions

Which feature is common to both electrolytic and galvanic cells?

• Anode is positive

• Redox reactions occur

• Energy is absorbed

• No electron flow

What causes the potential difference in a voltaic cell?

• Size of electrodes

• Difference in reactivity of electrodes

• Length of salt bridge

• Distance between electrodes

What is indicated by a negative E°cell value?

• Reaction is spontaneous

• Reaction is non-spontaneous

• Redox cannot occur

• Cell has no potential