Success Criteria for GCSE Metal Extraction Questions
WALT: Apply success criteria to answer GCSE questions on metal extraction 4-Mark Question Success Criteria: • Identify the metal ore and extraction method • Explain why this method is used (reactivity series) • Name the reducing agent or process • Write a balanced chemical equation 6-Mark Question Success Criteria: • All 4-mark criteria PLUS: • Calculate percentage of metal in ore using given data • Show working clearly with correct units • Round answer appropriately (usually 2 decimal places)
Model Answers for Self-Assessment
4-Mark Example: 'Explain how iron is extracted from iron ore' ✓ Iron ore contains iron oxide (haematite) ✓ Extracted using carbon in a blast furnace ✓ Carbon is more reactive than iron (displaces it) ✓ Fe₂O₃ + 3C → 2Fe + 3CO 6-Mark Example: 'Calculate % iron in Fe₂O₃ (Mr values: Fe=56, O=16)' ✓ Mr of Fe₂O₃ = (2×56) + (3×16) = 160 ✓ Mass of Fe = 2×56 = 112 ✓ % Fe = (112÷160) × 100 = 70.00%