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Half-cell
-an electrode and an electrolyte forming half of a complete cell

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Galvanic cell
-an arrangement of 2 half-cells that can produce electricity spontaneously

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Fuel cell
-an electric cell that produces electricity by continually supplied fuel

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Secondary cell
-these cells can be recharged
-recharged by using electricity to reverse the chemical reaction

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Primary cell
-an electric cell that cannot be recharged

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-a solid electrical conductor
-an aqueous electrical conductor

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In an electric cell or battery, the cathode is the positive electrode and the anode is the negative electrode

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Electric cell
-a device that converts chemical energy into electrical energy
-must have 2 electrodes and an electrolyte
-electron flow from anode to cathode ( - to +)

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-atoms in elements = 0
-hydrogen in compounds = +1
-hydrogen in hydrides = -1
-oxygen in coumpounds = -2
-oxygen in peroxides = -1
-all non poly-atomic ions = charge on ion

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Oxidation Numbers
-a number assigned to an element that represents the amount of electrons lost or gained

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Total number of electrons gained in reduction equals the number of electrons lost in oxidation

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Electrochemical Cells

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Reduction
G.E.R (Gain of Electrons)
-decrease in oxidation number

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Oxidation
L.E.O (Loss of Electrons)
-increase in oxidation number

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Redox Reactions
-chemical reaction where electrons are transferred between particles