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Comparison of a Button Cell to a Dry Cell

Comparison of a Button Cell to a Dry Cell. By Elisha, Jeremy and Tom. Button Cell. Chemistry of the Button Cell. Half Equations Cathode reaction Ag 2 O  (s)  + H 2 O  (l)  + 2e -  → 2Ag  (s)  + 2OH - Anode Reaction Zn  (s)  + 2OH -  → ZnO  (s)  + H 2 O + 2e - Full Equation

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Comparison of a Button Cell to a Dry Cell

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  1. Comparison of a Button Cell to a Dry Cell By Elisha, Jeremy and Tom

  2. Button Cell

  3. Chemistry of the Button Cell • Half Equations • Cathode reaction Ag2O (s) + H2O (l) + 2e- → 2Ag (s) + 2OH- • Anode Reaction Zn (s) + 2OH- → ZnO (s) + H2O + 2e- • Full Equation Zn (s) + Ag2O (s) → 2Ag (s) + ZnO (s)

  4. Cost and Practicality • Silver is an expensive metal • The production of the cell is therefore expensive • Non rechargeable • Small and light • Has a relatively long life span

  5. Impact on Society • Due to its small size it has allowed the production of small electrical appliances • Due to its non toxic nature it has allowed for it to be used inside the body

  6. Environmental Impacts • Due to its unrechargeable nature, it has to be discarded or recycled after only one use • Potassium hydroxide that is found within the cell is caustic (causing corrosion) • No highly toxic materials that will harm the environment

  7. Dry Cell/ Alkaline Cell

  8. Chemistry • Half Equations • Cathode reaction • MnO2(s) + 2H20(l) +2e  Mn(OH)2 (s)+2OH (aq) • Anode Reaction Zn(s)+2OH (aq)  Zn (OH)2 (s) + 2e • Overall Reaction • MnO2(s) + 2H20(l) + Zn(s)+2OH(aq)Mn(OH)2 (s)+2OH (aq)+Zn (OH)2 (s) - - - -

  9. Cost and Practicality • Very cheap • Form of paste it is very convenient , being very transportable. • Small and easy to store and use • Maintains a steady voltage, therefore they are good for a range of electronic such as torches, walkman and toys. • Cannot be recharged • Short life • Cannot deliver a high current • Battery may leak

  10. Impact on Society • Due to its low constant voltage it is used for common appliances such as torches, toys and portable radios/cds • Due to its mobility , portable items like flashlights could be used , therefore increasing the development of electrialequipments/ devices. • The popularity of batteries have increased

  11. Environmental Impact • Small amounts of zinc are not problematic, however large amounts of zinc is a threat. • Manganese is also a heavy metal, dispose in large quantities are not beneficial for the environment.

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