Limestone Test

Limestone is a hard sedimentary rock, composed mainly of calcium carbonate or dolomite, used as building material and in the making of cement. 

1 - Calcium Carbonate (s) - Calcium Oxide (s) + Carbon Dioxide (g)

     CaCO3 (s) - CaO (s) (Quicklime) + CO2 (g)

2 - Calcium Oxide (s) + Water (l) - Calcium Hydroxide (s)

     2CaO (s) + H20 (l) - 2Ca(OH)2 (s) (Slaked Lime)

3 - Calcium Hydroxide (s) + Water (l) - Calcium Hydroxide (aq)

     Ca(OH)2 (s) + H2O (l) - Ca(OH)2 (aq) (Limewater)

4 - Calcium Hydroxide (aq) + Carbon Dioxide (g) - Calcium Carbonate (s) + Water (l)

     2Ca(OH)2 (aq) + 2CO2 (g) - 2CaCO3 (s) (suspension) + 2H2O (l)

To make cement, limestone is heated with clay in an oven called a rotary kiln. 

Cement and sand make mortar which is the paste used for brick binding

Cement and sand, gravel and water make concrete, which is a thick liquid that can be poured into any shape that hardens and becomes very strong. It is cheaper and stronger than cement.

For concrete, there needs to be a good balance between each of the parts (gravel, sand, cement and water) and this balance will decide how crumbly or strong the concrete is.

Pros: 
Sain raw materials, which are needed for building 
Can sell the materials to make money 
Creates employment 
Can increase the wealth of an area 
Urbanisation of area (can be good and bad)

Cons: 
Noise pollution 
Dust pollution 
Increased traffic due to transportation of materials 
Urbanisation of area (can be good and bad)
Visually displeasing 
Ruins the landscape, destroys habitats