5.3 Metals and their extraction: How do we get the chemical resources needed to drive new technologies?
Use reactivity, redox and electrolysis to explain extraction choices and carry out reacting-mass calculations.
How to study WJEC GCSE The Sciences
Move from a scientific model to a prediction or method, collect or interpret evidence, show quantitative working and finish with a conclusion whose limits match the data.
Core concepts
Concept 1
Use competition and displacement evidence to order metals.
Exam cue: Identify the unit, entered tier, supplied reference material, command word and relevant scientific enquiry skill.
Concept 2
Choose extraction methods from reactivity and evaluate sustainability.
Exam cue: Balance the chemical change first, then use the mole or mass ratio and connect extraction choice to reactivity.
Concept 3
Calculate simplest formulae and reacting masses from balanced equations.
Exam cue: Use scientific terminology, show quantitative working with units, and connect conclusions to data and the stated model.
Concept 4
Official subtopics: 5.3.1 The reactivity of metals; 5.3.2 Extracting metals and using them sustainably; 5.3.3 Chemical calculations.
Concept 5
Scientific enquiry and mathematical skills apply in this topic; bold amplification is Higher Tier only.
Risk pitfalls and guardrails
Choosing carbon reduction for a metal more reactive than carbon or using an unbalanced equation for mass ratios.
Guardrail: Do not import outgoing 3430QD content, another science route, a fixed required-practical list or unsupported tier and connection assumptions.
Recalling a fact without applying it to the observation, data, practical method or unfamiliar context.
Guardrail: Use the live secure pack: Task A may use groups of up to three; Task B is individual and highly controlled. Two enquiries are selected by the centre from three.
Importing content, required practicals, tier rules or paper structure from the outgoing WJEC or another awarding-body route.
Guardrail: Bold amplification is Higher-only. Units 1-6 may mix tiers, but Unit 7 is untiered.
Memory anchors
Reactivity series
An ordering of elements according to their chemical reactivity.
Oxidation
Gain of oxygen or loss of electrons.
Reduction
Loss of oxygen or gain of electrons.
Electrolysis
Decomposition of an ionic substance using electric current.
Reacting mass
Mass relationship determined from a balanced chemical equation.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
Which observation shows that magnesium is more reactive than copper? Conserve atoms and use reactivity evidence before judging extraction or reacting mass. Choose the option that remains valid across the stated range.
Which balanced equation represents zinc displacing copper from copper sulfate? Conserve atoms and use reactivity evidence before judging extraction or reacting mass. Apply the model at the scale described.
Answer all questions to submit.
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Move forward only after this module is stable.
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