English National Curriculum - Science
Mission Objectives
Understand the conditions required for a material to undergo chemical reactions with its environment
Explain how protective coatings, including sacrificial methods, prevent material degradation
Interpret experimental results to identify the factors affecting material deterioration
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Words and meanings to learn
corrosion
chemical reactions between a metal and substances in the environment
rusting
the formation of hydrated iron (III) oxide
sacrificial protection
a method of preventing rusting by attaching a more reactive metal that corrodes instead of the iron
redox reaction
a reaction in which reduction and oxidation occur simultaneously; in rusting, iron is oxidised as it gains oxygen
galvanising
coating iron or steel with a layer of zinc to prevent rusting; the zinc acts as a protective barrier and provides sacrificial protection
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Nails that are not galvanised are needed; otherwise, it doesn’t work.
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