C1.2 Limestone and building materials Flashcards
What is the limestone cycle?
1) Calcium carbonate —– add heat (CO2 produced) (thermal decomposition)
2) Calcium oxide —– add little water
3) Calcium hydroxide —–add more water
4) Calcium hydroxide —– add carbon dioxide
5) Calcium carbonate
What is produced when a carbonate reacts with acid?
Carbon dioxide
A salt
Water
Sodium + Hydrochloric —-> ???
Carbonate acid
Water + Carbon dioxide + Sodium chloride
How is cement made?
What is it used for?
Heat powdered limestone with clay
To make mortar and concrete
How is mortar made?
What is it used for?
Mixing cement, sand and water together
Joins bricks together
How is concrete made?
What is it used for?
Mixing cement, sand, water and crushed rocks (aggregate) together
Makes buildings and bridges
Why is concrete good?
What is a disadvantage for using concrete?
It can be moulded into shape easily before setting hard
ca be unattractive
What is a disadvantage for using limestone, cement and mortar for buildings?
It slowly reacts with carbon dioxide dissolved in rainwater
It wears away leaving gaps in between the bricks in the buildings
Describe the limewater test
1) use a tube to blow carbon dioxide into the water
2) If it turns cloudy it is limewater
What are the advantages of quarrying? (3)
- Can be used to make glass and concrete
- Provides employment
- Improves local economy
What are the disadvantages of quarrying (3)
- Unattractive
- Damages the environment
- Creates noise and traffic
