Rusting Flashcards
What are ships made out of
Steel because it’s strong
What does rust do to steel
Makes it weak + flaky + dangerous
What is silica gel used for
A drying agent that removes moisture
What is steel made from
Iron and carbon
Why would a car not rust in the desert
The atmosphere is very dry
Word equation of rusting
Iron + oxygen + water -> hydrated iron (III) oxide
What happens to steel in salt
It speeds up the rusting process and makes it very rusty
Is gold a good alternative to steel
It’s too soft and expensive
What is stainless steel
Chromium + steel and no it doesn’t rust
What is copper used for
Water pipes
What is made of iron
Gates/railings
Bridges
Cars etc
What happens to a metal nail when there is water and oxygen present
Lots of rust occurs
What happens to a metal nail when oxygen and no water is present
No rust occurs
What happens to a metal nail when water and no oxygen is present
Very little use as it is very difficult to get rid of all oxygen
What happens to a metal nail when water,oxygen and since are present (galvanised)
No rust occurs
Chemical name for rust
Hydrated iron(III) oxide
What two conditions are required for rusting
Water (moisture) + oxygen
Four methods to prevent rusting
Painting/oiliing
Plastic coating
Galvanising
Sacrificial protection
What is does plastic coating do
It prevent air and moisture from reaching the iron
What is galvanising
When iron objects are coated with a more reactive metal such a as zinc or chromium
Cheapest method of preventing rust
Painting or oiling
Uses of rust prevention
Gate-painting
Hull of a ship-sacrificial protection
Machinery-oiling
Iron nail-galvanising
