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Word Count: 397
Electrochemistry is the study of chemical changes produced by electric current and with the production of electricity by chemical reactions All electrochemical reactions are redox reactions which means that electrons are always transferred Most electrochemical reactions occur in cells Cells are contained places for reactions where electricity enters and exits through electrodes There are two main types of cells One type the electrolytic cells requires electricity to produce a non-spontaneous chemical reaction The other type the electrochemical cells produces electricity through a spontaneous chemical reaction The electricity required or produced by an electrochemical reaction can be conducted through either ionic solutions in fluids or metals Electricity is carried through ionic solutions by the movement of dislike charges toward each other In metals electricity moves through metallic bonds this allows electrons to move freely In addition to being entrances and exits for electricity electrodes serve as surfaces where redox half reactions can take place Electrodes can also take part in the reactions If the electrodes do not take part in the reactions they are called inert electrodes No matter the cell however there are only two types of electrodes The first is the cathode which is where reduction occurs and electrons are being gained The cathode is where the electricity enters the cell either from an outside source or from the anode The second is the anode which is where oxidation occurs and electrons are being lost The anode is where electricity exits the cell either to an outside source or to the cathode Electrolytic cells have many commercial applications such as copper plating and the production of solid sodium Electrochemical cells are used as batteries or power sources Most simple electrochemical cells are created in the same manner They are made by using two different half-cells A half-cell contains an element in more than one oxidation state Each half-cell would be constructed with one electrode and a salt solution of that metal
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