Q51 · Practice questionComplex familiar5 marks
QUESTION 51 (5 marks)
A galvanic cell combines () and () half-cells under standard conditions.
a) Write the overall balanced reaction. [2 marks]
b) Calculate the standard cell potential. [1 marks]
c) State the direction of electron flow and salt-bridge anion migration. [2 marks]
WORKED SOLUTION
5 marksPractice marking scheme
; ; electrons Fe to Ag; anions to Fe half-cell.
Iron is oxidised and silver ions reduced. Match two electrons, then subtract the iron reduction potential from the silver reduction potential. Anions balance the extra Fe²⁺ generated at the anode.
- Identifies iron oxidation/silver-ion reduction. [1 marks]
- Writes the balanced net equation. [1 marks]
- Calculates 1.24 V. [1 marks]
- States electrons flow from Fe to Ag. [1 marks]
- States anions migrate towards the Fe half-cell. [1 marks]
Practice question aligned to the current QCAA syllabus; review the worked solution and marking criteria.
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