'n Spontane elektrokemiese sel word onder standaardtoestande opge stel met Ni en Ag wat as elektrodes gebruik word - NSC Technical Sciences - Question 6 - 2021 - Paper 2
Question 6
'n Spontane elektrokemiese sel word onder standaardtoestande opge stel met Ni en Ag wat as elektrodes gebruik word.
6.1 Kies EEN woord uit die stelling hierbo wat a... show full transcript
Worked Solution & Example Answer:'n Spontane elektrokemiese sel word onder standaardtoestande opge stel met Ni en Ag wat as elektrodes gebruik word - NSC Technical Sciences - Question 6 - 2021 - Paper 2
Step 1
6.1 Kies EEN woord uit die stelling hierbo wat aandui dat die sel 'n galvaniese sel is.
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Die woord 'spontane' dui aan dat hierdie sel 'n galvaniese sel is.
Step 2
6.2.1 Galvaniese sel
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‘n Galvaniese sel is 'n elektrochemiese sel wat kemiese energie omset in elektriese energie.
Step 3
6.2.2 Elektroliet
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‘n Elektroliet is 'n geleidingsoplossing wat ione bevat en in staat is om elektriese stroom te dra.
Step 4
6.3 Watter energieomsetting sal in die sel hierbo plaasvind?
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Die energieomsetting wat in die sel plaasvind, is die omsetting van chemiese energie in elektriese energie.
Step 5
6.4 Watter EEN van die elektrodes is die katode?
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Die katode in hierdie sel is die silwer (Ag) elektrode.
Step 6
6.5 Wat is die halfreaksie by die katode neer?
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Die halfreaksie by die katode is: Ag^+ (aq) + e^- → Ag (s).
Step 7
6.6 Bereken die emk van die sel onder standaardtoestande.
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Die emk van die sel kan bereken word deur die standaard potensiale van die halfreaksies te gebruik:
E₀_cell = E₀_cathode - E₀_anode = 0.80 V - (-0.27 V) = 1.07 V.
Step 8
6.7 Skryf die selnotasie vir die deel hierbo neer.
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Die selnotasie is: Ni(s) | Ni²⁺(aq) || Ag⁺(aq) | Ag(s).
Step 9
6.8.1 Noem EEN alternatiewe energiebron.
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‘n Alternatiewe energiebron is biodiesel.
Step 10
6.8.2 Noem DRIE gebruike van 'n fotovoltaïese sel.
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