Reactivity Series Flashcards
1
Q
What is the equation for metals and acid?
A
- acid + metal = salt + hydrogen
2
Q
What is the formula for metal and water?
A
- metal + water = metal hydroxide + hydrogen
3
Q
List the reactivity series
A
- potassium
- sodium
- lithium
- calcium
- magnesium
- aluminium
- zinc
- iron
- copper
- silver
- gold
4
Q
Why will the more reactive metal displace the less reactive metal from its oxide?
A
- it will bond more strongly to the oxygem
5
Q
When can rusting happen?
A
- when iron is in contact with both oxygen from the air and water
6
Q
What type of reaction takes place when iron corrodes?
A
- an oxidation reaction
- iron gains oxygen to form iron (iii) oxide
- water then becomes loosely bonded to the iron (iii) oxide and the result is hydrated iron(iii) oxide, rust
7
Q
What is the word equation for rust?
A
- Iron + oxygen + water = hydrated iron(iii) oxide (rust)
8
Q
What are the two main ways to prevent rusting?
A
- barrier methods: such as painting, coating with plastic, oiling
- sacrificial method
9
Q
Talk about barrier methods to prevent rusting
A
- painting/coating with plastic: ideal for big and small structures. can be decorative
- oiling/greasing: when moving parts are involved e.g. bike chains
10
Q
What is sacrificial protection?
A
- placing a more reactive metal with the iron
- zinc is often used as a sacrificial metal
- zinc is more reactive than iron, further up the reactivity series
- zinc will be oxidised instead
- a coating of zinc can be sprayed onto the object, known as galvanising
- big blocks of zinc can be bolted to the iron
