Chapter 2 - Rocks And Building Materials Flashcards
How do you make concrete
By mixing cement with sand, aggregate and water
What is the reaction called for calcium carbonate decomposing to make calcium oxide and carbon dioxide
Thermal decomposition
What do metal carbonates decompose to when heated strongly
Metal oxide and carbon dioxide
What do carbonates produced when reacted with acids
A salt, water and carbon dioxide
Why is limestone damaged by acid rain
The calcium carbonate in the limestone reacts with acids in the rain
What can calcium hydroxide be used for
To neutralise acids as it is an alkali. E.g. Farmers use it to neutralise acidic soil and in industry to neutralise acidic gases
Describe the process of the limestone cycle
Calcium carbonate is heated to produce calcium oxide and give off carbon dioxide. Add water to produce carbon hydroxide and add more water and filter to produce carbon hydroxide solution. Add carbon dioxide to form calcium carbonate again
How is cement made
Limestone is mixed with clay and heated strongly in a kiln.
How is mortar made
Cement is mixed with sand and water
What are the advantages of limestone quarrying
- More employment opportunities for local people
- More customers and trade for local businesses
- Improved roads
What are the disadvantages of limestone quarrying
- Dust and noise
- More traffic
- Loss of habitats for wildlife
What is limestone used to make
Calcium oxide and cement
