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Chemistry
Iron
Question | Answer |
---|---|
What is another way of saying iron rusts easily? | It corrodes easily |
What 2 things must iron be in contact with to rust? | 1. Oxygen 2. Water |
What kind of reaction is the oxidation of metal? | An oxidation reaction |
What compound is rust? | Hydrated iron (III) oxide |
What are the 2 main methods of preventing rust? | 1. Barrier methods 2. Sacrificial method |
What are the 2 barrier methods? | 1. Painting/coating with plastic 2. Oiling/greasing |
When is oiling/greasing used of painting with plastic? | When moving parts, such as bike chains, are involved |
What is the sacrificial method? | Placing a more reactive metal with the iron, which the water and oxygen react with |
What metal is commonly used as a sacrificial metal? | Zinc |
Coating zinc on iron to prevent rusting is known as what? | Galvanising |