Electrochemical Reactions and Batteries Quiz

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Questions and Answers

What is the purpose of connecting the Alaskan pipeline to zinc wires?

To prevent corrosion by sacrificing the zinc instead of the steel.

What are the two half-reactions involved in electrochemical cell reactions?

One on the anode electrode and one on the cathode electrode.

How is electrode cell potential measured?

In volts.

How can the voltage of an electrochemical cell be determined?

By subtracting the electrode potential of the anode from that of the cathode. Signup and view all the answers

How can corrosion be prevented using chemical reactions?

By introducing a different metal that is more easily oxidized than the metal to be protected. Signup and view all the answers

What is the purpose of a zinc-carbon dry cell?

To capture electricity and produce power. Signup and view all the answers

What is the anode in a zinc-carbon dry cell?

The zinc container. Signup and view all the answers

What is the cathode in a zinc-carbon dry cell?

The carbon rod. Signup and view all the answers

What are the half-reactions at the anode and cathode in a zinc-carbon dry cell?

Anode: Zn(s) = Zn2+ (aq) + 2e-, Cathode: 2MnO2 (s) + H2 O (l) + 2e- = Mn2 O3 (s) + 2OH- (aq). Signup and view all the answers

How can corrosion of metal be prevented?

By coating the metal with a more easily oxidized metal, such as zinc, through a process called galvanization. Signup and view all the answers

What are the two half-reactions in an electrochemical cell?

The two half-reactions in an electrochemical cell are the anode electrode and the cathode electrode. Signup and view all the answers

What happens at the anode electrode?

Oxidation occurs at the anode electrode, causing the loss of electrons. Signup and view all the answers

What happens at the cathode electrode?

Reduction occurs at the cathode electrode, causing the gain of electrons. Signup and view all the answers

How can the full cell reaction be written using half-reactions?

The full cell reaction can be written by combining both half-reactions. For example, in the case of zinc and copper electrodes, the reaction is written as: $Zn(s) + Cu^{2+}(aq) = Zn^{2+}(aq) + Cu(s)$. Signup and view all the answers

How is an electrochemical cell diagram typically shown?

An electrochemical cell diagram is typically shown as: Anode electrode - anode solution - cathode solution - cathode electrode. For example, in the case of zinc and copper electrodes, the diagram is shown as: $Zn(s) - Zn^{2+}(aq) - Cu^{2+}(aq) - Cu(s)$. Signup and view all the answers

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