2.1 - Limestone and its uses Flashcards
1
Q
Why do we quarry large amounts of limestone?
A
It has many uses
2
Q
What are some uses of limestone? (4)
A
- Blocks of limestone can be used for building
- Can be used to make cement
- Can be used to make calcium oxide
- Can be used to make concrete
3
Q
How can limestone be used to make concrete?
A
Limestone can be used to make cement. When cement is mixed with sand, aggregate and water, concrete is made
4
Q
What is limestone mainly composed of?
A
Calcium carbonate
5
Q
What is the formula of calcium carbonate?
A
CaCO3
6
Q
How can calcium oxide be made from limestone? (4)
A
- When heated strongly, calcium carbonate decomposes
- to make calcium oxide and carbon dioxide
- this is a thermal decomposition reaction
- this can be done on a large scale in lime kilns
7
Q
What does thermal decomposition mean?
A
‘breaking down by heating’
8
Q
What is the equation for the thermal decomposition of calcium carbonate?
A
CaCO3 –> CaO + CO2
