Voltaic Cells

What is a cathode?

• It is the electrode where oxidation takes place.

• It is the electrode where reduction takes place.

• It is an aqueous solution containing an electrode.

• It is the salt bridge that connects half-cells.

Which of the following reactions would be spontaneous?

• 3Ag + Al³⁺ --> 3Ag⁺ + Al

• Pb + Mg²⁺ --> Pb²⁺ + Mg

• 2Ag⁺ + Zn --> Zn²⁺ + 2Ag

• Ag + Na⁺ --> Na + Ag⁺

Which of the following reactions is spontaneous?

• Cu + Ca²⁺ --> Cu²⁺ + Ca

• Fe²⁺ + Mg --> Mg²⁺ + Fe

• Ni + Mg²⁺ --> Mg + Ni²⁺

• Al + 3Na⁺ --> 3Na + Al³⁺

Which of the following correctly describes the processes that occur at the anode and cathode in a voltaic cell?

• oxidation at both the anode and the cathode

• oxidation at the cathode, reduction at the anode

• oxidation at the anode, reduction at the cathode

• reduction at both the anode and the cathode

Which answer choice correctly describes the flow of electrons in a voltaic cell?

• electrons flow from the anode to the cathode through the salt bridge

• electrons flow from the cathode to the anode through the salt bridge

• electrons flow from the anode to the cathode through the wire

• electrons flow from the cathode to the anode through the wire

What is the purpose of the salt bridge in a voltaic cell?

• Permits the exchange of water between the two half cells

• Permits the exchange of atoms between the two half cells

• Permits the exchange of electrons between the two half cells

• Permits the exchange of ions between the two half cells

Which of the following energy conversions occurs in a voltaic cell?

• electrical to nuclear

• electrical to chemical

• chemical to electrical

• nuclear to electrical

Which of the following describes the redox reaction that occurs in a voltaic cell?

• spontaneous

• nonspontaneous

• could be either spontaneous or nonspontaneous

If the two electrodes in a voltaic cell are Mg and Zn, which will be oxidized?

• Zn

• Mg

This electrode in a voltaic cell gains mass

• Anode

• Cathode