GCSE Chemistry (AQA)

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Corrosion & Rusting

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Corrosion & Rusting

4:46 Corrosion and its prevention
Spec 4.10.3.1
Previous Reduce, Reuse, Recycle Next Preventing Corrosion
  • Corrosion is the destruction of materials by chemical reactions with environmental substances.
  • Certain chemicals can erode materials, leading to structural breakdown, known as corrosion.
  • Rusting is a common example of corrosion, requiring both air and water for iron to rust.
  • When iron is exposed to oxygen and water, it turns orange or reddish-brown and flaky, forming rust.
  • Rusting is represented by the chemical equation: Iron + Oxygen + Water ��� Hydrated Iron (III) Oxide.
  • Only iron rusts, as rust is an oxide of iron.
  • Rusting is an example of corrosion because it causes iron to break down over time with continued exposure to oxygen and water.
  • Experiments can demonstrate that both air and water are necessary for rusting.
  • A school laboratory experiment can investigate rusting conditions by placing iron nails in different environments.
  • In the experiment, only the nail exposed to both air and water rusted, confirming the need for both conditions.
  • The experiment's results showed an increase in mass for the rusted nail, indicating rust formation.
  • Understanding and interpreting such experiments is important for exams to demonstrate the necessity of air and water for rusting.

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