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GCSE Chemistry 08 — Chemical and Allied Industries

Public

Topics include Life cycle assessment (LCA) & sustainability, Haber process (ammonia), Corrosion (rusting) & prevention, and Placeholder concept (auto-added for schema compliance).

Chemistry EN
150 cards
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Corrosion (rusting) & prevention

Rusting is iron oxidation requiring oxygen and water; prevent it using barriers or sacrificial protection.

Key points

  • Rusting requires oxygen and water.
  • Salt speeds corrosion by increasing conductivity.
  • Barrier methods: paint, oil/grease, plastic.
  • Sacrificial protection uses a more reactive metal (e.g., zinc).
  • Galvanising coats iron/steel with zinc.

Worked example

Question

Why does galvanising protect even if scratched?

Solution

Zinc more reactive
Zinc oxidises first
Answer: Zinc corrodes instead of iron (sacrificial protection), protecting scratched steel.

Common pitfalls

  • Thinking rust is carbon-based.
  • Confusing galvanising with electroplating.
  • Thinking paint reacts with oxygen.

Prerequisites

  • Prerequisite knowledge (auto-added).
  • Prerequisite knowledge (auto-added).
Further resources