[Introduction Electrochemistry is the study of interchange of chemical and electrical energy.
Oxidation/Reduction involves the exchange of electrons from one chemical species to another. Normally, this is done when the two chemicals contact each other in the activated complex (when two species bump into each other in solution for example).
We are interested in separating the chemical species such that the electrons transfer via an external circuit. That way, we can measure the electrochemical effects.
To properly understand the connection between the redox reaction and the electricity, we should balance the overall redox reaction using a half-reaction method such as the one described in the previous section of these notes. We can set up the physical reaction vessel such that the chemicals from one half reaction are separated from those of the second half reaction. For reaction to occur, we still need to connect the solutions to complete the circuit. This is done by attaching wires between electrodes in the two half cells and by connecting the solutions of the two half cells via a salt bridge or by some other device such as a semi-permeable membrane.
In general, such a cell is called an electrochemical cell. These cells could be used in one of two types of situations:
Oxidation/Reduction involves the exchange of electrons from one chemical species to another. Normally, this is done when the two chemicals contact each other in the activated complex (when two species bump into each other in solution for example).
We are interested in separating the chemical species such that the electrons transfer via an external circuit. That way, we can measure the electrochemical effects.
To properly understand the connection between the redox reaction and the electricity, we should balance the overall redox reaction using a half-reaction method such as the one described in the previous section of these notes. We can set up the physical reaction vessel such that the chemicals from one half reaction are separated from those of the second half reaction. For reaction to occur, we still need to connect the solutions to complete the circuit. This is done by attaching wires between electrodes in the two half cells and by connecting the solutions of the two half cells via a salt bridge or by some other device such as a semi-permeable membrane.
In general, such a cell is called an electrochemical cell. These cells could be used in one of two types of situations:
- The chemical reaction is spontaneous and produces electricity.
This is called a voltaic cell or a galvanic cell. - The chemical reaction is non-spontaneous and is forced by electricity from an external source.
This kind of cell is called an electrolysis cell.
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