C15 - L - 1 Rusting

What causes corrosion?

• Exposure to sunlight

• Chemical reactions with the environment

• Physical wear and tear

• High temperatures

What is the corrosion of iron called?

• Tarnishing

• Pitting

• Oxidation

• Rusting

What are the necessary elements for iron to rust?

• Iron and oxygen

• Iron, oxygen, and water

• Iron, oxygen, and sunlight

• Iron and carbon dioxide

What is rust chemically known as?

• Iron sulfide

• Iron (II) oxide

• Iron carbonate

• Iron (III) oxide

How can you prevent iron from rusting?

• Exposing it to sunlight

• Keeping it in a vacuum

• Heating it regularly

• Preventing water and oxygen from reacting with it

Which of the following is NOT a method to prevent rust?

• Coating with plastic

• Coating with paint

• Soaking in vinegar

• Coating with a less reactive metal

What happens if a less reactive metal coating on iron is scratched?

• The coating will repair itself

• Iron will rust and the rust will spread under the coating

• Iron will not rust

• The iron will become stronger

What is the process of coating iron with zinc called?

• Plasticization

• Vulcanization

• Galvanization

• Oxidation

Why does zinc protect iron from rusting?

• Because it forms a physical barrier only

• Because it is more reactive than iron

• Because it absorbs all the oxygen

• Because it is less reactive than iron

What is sacrificial protection?

• A method where iron sacrifices itself to protect another metal

• A method where a more reactive metal is used to protect iron

• A method where iron is coated with plastic

• A method where iron is kept in a vacuum to prevent rusting