Redox Reactions and Electrochemistry IGCSE Chemistry: Complete Guide

⚡ Understanding Redox in IGCSE Chemistry

Redox reactions involve electron transfer between substances. This guide covers oxidation, reduction, and electrochemical applications.

🧠 Memory Tips

Redox: “OIL RIG”

• Oxidation Is Loss (of electrons)
• Reduction Is Gain (of electrons)

Oxidation States: “PANIC”

• Positive for metals
• Always check hydrogen (+1)
• Negative for non-metals
• Ions have their charge
• Compounds sum to zero

📚 Key Concepts

Redox Definitions

• Oxidation: Loss of electrons, increase in oxidation state
• Reduction: Gain of electrons, decrease in oxidation state
• Oxidizing agent: Causes oxidation, gets reduced
• Reducing agent: Causes reduction, gets oxidized

Oxidation States

• Rules: Help identify electron transfer
• Elements: Always zero
• Ions: Equal to charge
• Compounds: Sum to zero

Common Redox Reactions

• Metal + Acid: Metal oxidized, H⁺ reduced
• Combustion: Fuel oxidized, O₂ reduced
• Displacement: More reactive metal displaces less reactive

Electrochemical Cells

• Galvanic cells: Generate electricity
• Electrolytic cells: Use electricity
• Electrodes: Anode (oxidation), Cathode (reduction)

🎯 Exam Focus

Common Questions:

1. Identify oxidation and reduction (4 marks)
2. Calculate oxidation states (3 marks)
3. Explain electrochemical cells (5 marks)
4. Balance redox equations (6 marks)

Key Applications:

• Batteries and fuel cells
• Electroplating
• Metal extraction
• Corrosion prevention

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