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Summary AQA A level chemistry electrochemical cells full revision notes
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A helpful and comprehensive set of revision notes covering the entire electrochemical cells unit of AQA A level chemistry
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Eleetrode Potentias20.1 ELECTROCHEMICAL CELLS
If you plau two ditteeent metas electroyte and onneet them,
a urent lws where lectrons nmort from the mor reatve metad
to the less reactive.
Halt cells
Zni) Z'cag) t 2e
Halt el in equilibrium.
Two hat cell s can be joined toqether
to mke cn electrcal l.
Connect the eletrodes and measure potentiaddifferenu
Circuit is completed with a salt bndqe ((fltee paper soaked
a satuated souticm ot potas sium nibrote. KNO,)
lows novement ot (ons, (nert.
- Zine electrode is neyatie
’Zine is more reactve tha
copper, meR read1ly axidised
ZnZn t2e
ZInc
Copper
-21nl is Oxidised, coppeis reduced
cl diagruams
- vertcal line shows aphase boundy
double veetiad ine shows a salt bridge
most oxidised sp eies next to sat br1dye
E vas determn which way to wrte the all
Eletchemica cels
when the voltmeter is removed from the crut and replaed with
SOm ething lu le.g. bwb ammete, a uurent can tlow
-
Conentration ot reocionts w dereasu as reacten ocu
eventuay EME dereoses to
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