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Samenvatting Chemie Overal vwo 6 - H17 $7.08   Add to cart

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Samenvatting Chemie Overal vwo 6 - H17

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Samenvatting scheikunde vwo 6 - H17; brandstofcellen

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  • Hoofdstuk 17
  • June 10, 2022
  • 2
  • 2020/2021
  • Summary
  • Secondary school
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Scheikunde samenvatting - H17

Elektrochemische cellen = verzamelnaam voor batterijen en accu’s; chemische
energie wordt omgezet in elektrische energie.
• Bestaat uit twee halfcellen (ruimtes waar apart reactie van oxidator en reductor
plaatsvinden)


Daniellcel = eerste elektrochemische cel (batterij)
• Zoutbrug = buisje met geleidende zoutoplossing, die zorgt voor gesloten
stroomkring in elektrochemische cel.
• Membraan = poreuze wand die selectief ionen doorlaat.


Positieve elektrode (pluspool) = elektrode waaraan oxidator reageert
Negatieve elektrode (minpool) = elektrode waaraan reductor reageert


Bronspanning (van elektrochemische cel) = verschil tussen
standaardelektrodepotentiaal van ox en red.


Staafbatterij = elektrochemische cel (batterij)
• Elektrolyt = pasta vulmiddel dat werkt als zoutbrug of membraan.
• Negatieve elektrode: reductorPositieve elektrode: staaf in midden >
staat in contact met oxidator


Oplaadbare batterij (bijv: accu) = stoffen die bij stroomlevering in
halfcellen worden gevormd, blijven bij elektrodes (door bijv: neerslagreactie)


Elektrolyse = elektrische energie wordt omgezet in chemische energie.
• Bij opladen van oplaadbare batterij worden reactieproducten van stroomlevering
omgezet in beginstoffen; reacties die plaatsvinden bij stroomlevering verlopen in
omgekeerde richting.
• Oxidator reageert aan negatieve elektrodeReductor reageert aan positieve
elektrode


Brandstofcel = elektrochemische cel waarbij in ene halfcel continu zuurstof (oxidator)
wordt geleidt, in andere halfcel reageert een brandstof (reductor).


Energiedichtheid = hoeveelheid energie per volume-eenheid.

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