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Published byRonald Alexander Modified over 9 years ago
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SUMMARY Redox: Electrochemical Cells
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Introduction- Electricity on the Move Batteries are vital for a whole variety of portable electric and electrical gadgets: laptop computers, mobile phones, personal stereos and camcorders
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1 A half cell consists of….. A metal in contact with a solution of its own ions
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2 The salt bridge connects…… The ions in the two half cells
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3 The wire connects the two different half cells allowing….. The flow of electrons
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4 Half cells develop electrical potential because of….. The tendency of all metals to give away electrons
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5 If two half cells are connected by a votmeter and salt bridge…. Their potential difference(e.m.f) can be measured
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6 If the other half cell is a standard hydrogen elctrode, the measured emf is called… E o (E standard)
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7 E o values are measured at standard conditions which are ….. 1mol/dm3 solutions, 100 Kpa pressure and 298K temperature
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8 E o values for half cells are listed in order, with the most negative(the best electron releasers) at the top, to give….. The electrochemical series
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9 The electrochemical series can be extended to systems other than metal/metal ion by….. Making electrical contact with a platinum electrode
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10 Half cells high in the electrochemical series can transfer electrons to ….. Half cells lower in the list
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11 The feasibility of reactions can be predicted by ….. The anticlockwise rule
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12 The feasibility of reactions can also be predicted by…. Calculating E o reaction
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13 This is done by ….. Adding together two half reactions and their E o values
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14 In order for the electrons in the half reactions to cancel out …. one of the half reactions must be reversed (and thus the sign of its E o value changed )
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15 If the reaction is feasible…. E o reaction is positive usually greater than 0.4V.
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