Topic 3 - Patterns Of Reactivity Flashcards
What does RUST do to steel?
It makes it go flaky, weak and dangerous.
What is silica used for?
Drying.
What is steel made from….?
Steel is made from Iron.
Why do sunken ships, especially ‘The Titanic’ not rust as much as expected?
Because there’s very little air in the water.
How do we prevent rust in ships?
Repaint it.
Why are materials such as gold not used as an alternative to steel?
It’s too soft and it’s expensive.
Does stainless steel rust?
Stainless steel does not rust.
What is copper used for?
Copper is used for water pipes and wires.
What are shops built from and why?
Steel because it’s readily available and strong.
What is the chemical name for rust?
Hydrated iron (iii) oxide
What conditions are required for rusting?
You need oxygen and water.
Name 4 methods to prevent iron from rusting.
- Painting / oiling
- Plastic coating
- Galvanising
- Sacrificial protection
What is galvanising?
When iron objects are coated coated with a more reactive metal such as zinc.
Name 2 metals that can galvanise iron.
Zinc and chromium.
The cheapest method to prevent rusting is…
Painting
