Spontaneous Cell
Speed:
Half Cell 1 Details
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Selected Reagent:
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Electrode Polarity:
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Half-Equation:
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Visual Observations & Explanation:
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Half Cell 2 Details
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Selected Reagent:
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Electrode Polarity:
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Half-Equation:
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Visual Observations & Explanation:
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Vertical Addition & Mole Ratio Balancing
Select proper multipliers to balance total electrons lost and gained.
Eq 1:
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Multiplier ×
Eq 2:
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Multiplier ×
Overall Ionic Equation:
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Adjust multipliers so electrons cancel out completely.
HKDSE Electrochemical Series (ECS) Reference Table
Arranged according to relative strength in HKDSE syllabus order.
💡 HKDSE Spontaneity Rule:
A reaction occurs spontaneously if the Oxidizing Agent (Left) is located lower down in the series than the Reducing Agent (Right).
* Note: Standard electrode potentials are omitted in accordance with HKDSE examination guidelines.
HKDSE Redox Practice Quiz 25 Questions
Q1–10: True / False (Concepts) | Q11–25: Multiple Choice (Application & Calculations)
Question 1 of 25
True / False Question
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Performance Summary
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HKDSE Chemistry Assessment Report
Official Redox & Chemical Cell Performance Analysis
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