Year 11 - Science
Corrosion and its prevention
Industrial chemistry
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit covers corrosion, prevention methods, and properties of alloys, ceramics, polymers, and metals. It explores industrial processes like the Haber process, fertiliser production, reaction rates, yields, atom economy, and the trade-offs involving conditions and equilibrium.
Lesson Summary
You will learn to describe corrosion in detail, including chemical equations, and describe what actions can be taken to prevent corrosion.
Key Notes
- Corrosion is a general process of degradation of metals through various causes.
- Rusting is a specific type of corrosion, affecting iron in the presence of air and moisture.
- A metal oxide layer can protect the underlying metal if the oxide forms a physical barrier.
- Some coatings are reactive and contain a more reactive metal to provide sacrificial protection, e.g. zinc to galvanise.
- Electroplating can be used to improve the appearance and/or the resistance to corrosion of metal objects.
Vocabulary To Learn
- rusting: The corrosion of iron or steel, in the presence of water and oxygen.
- corrosion: The gradual deterioration of a substance when it reacts with substances in the environment, for example when a metal oxidises in air.
- sacrificial protection: Using a more reactive metal to corrode preferentially, to protect another metal from corrosion.
- tarnishing: The process by which a thin, discoloured layer forms on the surface of a metal due to reactions with the environment, e.g. oxidation.
- electroplating: A process that uses electricity to deposit a thin layer of metal onto the surface of another conductive object.
Common Mistakes To Avoid
- Students often believe rusting refers to the oxidation of any metal, and that corrosion is linked to the hazard 'corrosive'.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Corrosion is a general process of degradation of metals through various causes. Rusting is a specific type of corrosion, affecting iron in the presence of air and moisture.
2. Define this scientific word and use it in context. 'rusting'
The corrosion of iron or steel, in the presence of water and oxygen. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Students often believe rusting refers to the oxidation of any metal, and that corrosion is linked to the hazard 'corrosive'. Correction: Highlight the conditions required for rusting, and the general description of corrosion.
More Lessons In This Unit
- Ammonia: NPK fertiliser production and other applications Study Guide
- Chemical equilibrium Study Guide
- Comparing materials and their properties Study Guide
- Corrosion and its prevention: including half equations Study Guide
- Equilibrium: balance between rate, safety, environment and economics Study Guide
- Factors affecting equilibrium Study Guide
- Industrial equilibria: Contact Process Study Guide
- Industrial equilibria: Haber Process Study Guide
- Introduction to reversible chemical reactions Study Guide
- Making ammonia Study Guide
- NPK fertilisers, agriculture and other applications Study Guide
- Percentage yield and atom economy Study Guide
- Percentage yield and atom economy (RAM 1 d.p.) Study Guide
- Transition metals Study Guide
- Transition metals: physical and chemical properties Study Guide
- Transition metals: properties and uses Study Guide
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