Corrosion and rusting

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Corrosion is the destruction of materials by *

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physical processes

chemical reactions with substances in the environment

The corrosion of iron is called *

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tarnishing

rusting

Other:

What is the chemical name for rust? *

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Iron (III) oxide, Fe2O3

Iron (III) hydroxide, Fe(OH)3

Hydrated iron (III) oxide

Which conditions are necessary for iron to rust? *

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Oxygen in air

Water

Both of the above

Galvanising means coating an iron (Fe) or steel object with a layer of zinc (Zn) to protect it from corrosion. Steel cans can also be coated with tin (Sn), also to protect it from corrosion, including fruit juices in 'tin' cans. When the zinc coating is scratched through to the iron underneath, the iron still does not corrode intially. However, if the tin surface is scratched through to the iron, the iron corrodes even faster compared to when there was no coating at. This means?

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tin is more reactive than iron

zinc is less reactive than iron

iron corrodes faster when connected to a more reactive metal

iron corrodes faster when connected to a less reactive metal

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Which of these metals can be used in the 'sacrificial corrosion' method for protecting steel structures from rusting?

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Silver

Zinc

Iron

Tin

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Which of the the following nails will rust?

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What does each test tube contain?

4 points

Oxygen

Water

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