Transcription of Electrochemistry
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Electrochemistry
ElectrochemistryChemical reactions at an electrode, galvanic and electrolytic cellsA Chem1 Reference TextStephen K. Lower Simon Fraser University1 Table of contents1:Chemistry and electricity .. 3 Electroneutrality .. 3 Potential differences at interfaces .. 52:Electrochemical cells .. 6 Transport of charge within the cell .. 7 Cell description conventions .. 8 Electrodes and electrode reactions .. 8 Standard half-cell potentials .. 9 Reference electrodes .. 113:Prediction and significance of cell potentials .. 12 Cell potentials and the electromotive series.
1.1 Electroneutrality Nature seems to strongly discourage any process that would lead to an excess of positive or negative charge in matter. Suppose, for example, that we immerse a piece of zinc metal in pure water. A small number of zinc atoms go into solution as Zn ions, leaving their electrons behind in the metal: Zn(s) → Zn 2+ + 2 e–
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