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Electrochemistry
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Active nonmetals:

Gain electrons easily

Are easily reduced

Are strong oxidizing agents

Slide 12

Electrochemical Terminology

Electrochemical Terminology

Half-cell: a metal electrode in contact with a solution of its own ions

Electrode: A conductor used to establish contact with a nonmetallic part of a circuit, such as an electrolyte

Anode: The electrode where oxidation takes place

Cathode: The electrode where reduction takes place

Slide 13

Voltaic Cells

Voltaic Cells

Voltaic cells: Electrochemical cells in which a spontaneous redox reaction can be harnessed to produce an electric current.

Anode:

negative

Cathode:

positive

Slide 14

Zinc  Copper Battery

Zinc Copper Battery

Slide 15

Zinc-Carbon Dry Cell Battery

Zinc-Carbon Dry Cell Battery

Slide 16

Mercury Dry Cell Battery

Mercury Dry Cell Battery

Slide 17

Lead Storage Automotive Battery

Lead Storage Automotive Battery

Slide 18

Electrolytic Cells

Electrolytic Cells

Electrolytic cells: Electrochemical cell in which an electric current is used to drive a non-spontaneous process

Cathode:

negative

Anode:

positive

Slide 19

Electrolysis of H2O

Electrolysis of H2O

2H2O  2H2 + O2

Electrolyte is usually dilute sulfuric acid

Slide 20

Electroplating of Silver

Electroplating of Silver

Cathode is the object to be plated

Anode is a piece of the plating metal

Solution contains ions of the plating metal

Slide 21

Standard Reduction Potentials

Standard Reduction Potentials

Slide 22

Measuring Electrode Potential

Measuring Electrode Potential

1. H2 Electrode is assigned a potential of zero volts

2. Second electrode is placed in a solution of its own ions

3. Reduction potential of second electrode is measured.

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