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Half Equations - Coggle Diagram
Half Equations
CATHODE (−)
• Attracts positive ions
• Ions GAIN electrons
• Reduction
• Cu²⁺ + 2e⁻ → Cu
ANODE (+)
• Attracts negative ions
• Ions LOSE electrons
• Oxidation
• 2Cl⁻ → Cl₂ + 2e⁻
HOW TO WRITE THEM
• Write ion + product
• Balance atoms
• Add electrons
• Balance charge
OIL RIG
• Oxidation Is Loss
• Reduction Is Gain
• Refers to ELECTRONS
WHAT ARE THEY?
• Show reaction at one electrode
• Show electron transfer
• Used in electrolysis/redox
EXAMPLES
• Al³⁺ + 3e⁻ → Al
• Cu²⁺ + 2e⁻ → Cu
• 2Cl⁻ → Cl₂ + 2e⁻
CHECK
• Atoms balanced?
• Charge balanced?
• Electrons included?