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Redox : Electrochemical Cells

Redox : Electrochemical Cells. Summary. 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. 1. A half cell consists of…..

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Redox : Electrochemical Cells

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  1. Redox: Electrochemical Cells Summary

  2. 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

  3. 1 A half cell consists of….. A metal in contact with a solution of its own ions

  4. 2 The salt bridge connects…… The ions in the two half cells

  5. 3 The wire connects the two different half cells allowing….. The flow of electrons

  6. 4 Half cells develop electrical potential because of….. The tendency of all metals to give away electrons

  7. 5 If two half cells are connected by a votmeter and salt bridge…. Their potential difference(e.m.f) can be measured

  8. 6 If the other half cell is a standard hydrogen elctrode, the measured emf is called… Eo(E standard)

  9. 7 Eovalues are measured at standard conditions which are ….. 1mol/dm3 solutions, 100 Kpa pressure and 298K temperature

  10. 8 Eovalues for half cells are listed in order, with the most negative(the best electron releasers) at the top, to give….. The electrochemical series

  11. 9 The electrochemical series can be extended to systems other than metal/metal ion by….. Making electrical contact with a platinum electrode

  12. 10 Half cells high in the electrochemical series can transfer electrons to ….. Half cells lower in the list

  13. 11 The feasibility of reactions can be predicted by ….. The anticlockwise rule

  14. 12 The feasibility of reactions can also be predicted by…. Calculating Eoreaction

  15. 13 This is done by ….. Adding together two half reactions and their Eo values

  16. 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 itsEo value changed )

  17. 15 If the reaction is feasible…. Eoreaction is positive usually greater than 0.4V.

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