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GALVANIC CELL (DRY CELL (Chemistry (chemical reactions: (The paste of…

- - - - Anode creates electrons,
        
        Cathode absorbs them,
        
        Net product is electricity
        
        Stop when one or both of the electrodes run out of the substance
    - - The paste of ammonium chloride reacts:
        2 NH_4 (aq) + 2e^- → 2 NH_3 (g)+H_2 (g)
      - The manganese(IV) oxide in the cell removes the H2 produced by the ammonium chloride
        2 MnO_2 (s) + H_2 (g) → Mn_2O_3 (s) + H_2O (l)
      - The combined result of these two reactions takes place at the cathode
        2 NH_4 (aq) + 2 MnO_2 (s) + H_2 (g) → Mn_2O_3 (s) + H_2O (l) + 2 NH_3 (g)
      - The anode half-reaction
        Zn (s) → Zn^2+ + 2 e^-
  - - - advantage :check:
        
        Minimal environmental problems (disposal):
        a) manganese (III) is oxidised--insoluble--immobilised
        b) small quantities of zinc
        c) ammonium slats and carbon--harmless
        
        Can be recycle
      - disadvantage :red_cross:
        
        Disposal into environment without control:
        animals consume -- disastrous effects on the creatures' health
        
        Crack open + leak:
        chemical poison the ground -- get into water table --unsafe to drink water (area)
    - - advantage :check:
        
        Cheap / inexpensive upfront
        
        Make thing possible: compact size -- suitable for powering small electronic
        
        Easy to store and use
      - disadvantage :red_cross:
        
        Doesn't contain large amount of electricity -- replace constantly -- expensive overtime
        
        Cannot deliver very high current
        
        Goes flat - develop leaks: contact with skin - chemical burn
        
        Disposal into envi- without control: animals consume -- disastrous effects on the creatures' health