Die selnotasie Zn(s)|Zn²⁺ (aq)|Cu²⁺ (aq)|Cu(s) verteenwoordig 'n galvaniese sel wat onder standaardtoestande funksioneer - NSC Technical Sciences - Question 6 - 2020 - Paper 2
Question 6
Die selnotasie Zn(s)|Zn²⁺ (aq)|Cu²⁺ (aq)|Cu(s) verteenwoordig 'n galvaniese sel wat onder standaardtoestande funksioneer.
6.1.1 Definieer die term galvaniese sel.
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Worked Solution & Example Answer:Die selnotasie Zn(s)|Zn²⁺ (aq)|Cu²⁺ (aq)|Cu(s) verteenwoordig 'n galvaniese sel wat onder standaardtoestande funksioneer - NSC Technical Sciences - Question 6 - 2020 - Paper 2
Step 1
Definieer die term galvaniese sel.
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Answer
A galvanic cell is an electrochemical cell that converts chemical energy into electrical energy through spontaneous redox reactions.
Step 2
Teken 'n benoemde diagram om die Zn-Cu-sel voor te stel. Toon die vloeiing van die elektrone in die ekstreme stroombaan.
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The diagram should include:
Anode on the left (Zn electrode).
Cathode on the right (Cu electrode).
Salt bridge connecting both half-cells.
Flow of electrons from Zn (anode) to Cu (cathode), indicated with arrows.
Step 3
Skryf TWEE standaardpotensiale neer waaronder die Zn-Cu-sel funksioneer.
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Answer
E°(Zn²⁺/Zn) = -0.76 V
E°(Cu²⁺/Cu) = +0.34 V
Step 4
Na watter halfsel migreer (beweeg) die anione in die soutbrug?
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Answer
The anions migrate towards the Zn half-cell.
Step 5
Verduidelik die antwoord op VRAAG 6.1.4.
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Answer
Anions move towards the zinc half-cell because zinc is oxidizing and producing Zn²⁺ ions, thus creating a shortage of negative charge that the anions need to balance.
Step 6
Die anode in die Zn-Cu-sel word deur 'n onbekende elektroode, X, verteenwoordig. Die voltmeter gee 'n lesing van 2,00 V.
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Answer
This indicates that the overall cell potential is positive, suggesting that the oxidation reaction at anode X is favorable.
Step 7
Skryf 'n vergelyking neer wat X gebruik in die berekening.
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Answer
The cell potential can be calculated using:
E°cell=E°cathode−E°anode
For cell X: 2.00 V = (+0.34 V) - E°(X)
Step 8
Skryf die elektrode se naam in afkorting.
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Answer
X = Aluminium/A⁺/negative electrode.
Step 9
Verduidelik die antwoord op VRAAG 6.2.3.
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Answer
The explanation should involve the role of electrode X in the electrochemical reactions that occur in relation to zinc oxidation and copper reduction.
