What is limestone?
What is Limestone, marble and chalk made from?
Sea shells that have been buried in the ground.
The chemical name for these rocks is Calcium Carbonate
The chemical formula for these rocks is CaCO3
How is calcium carbonate useful?
We have to cut and quarry it out of the ground
thermally decompose it
add water and other materials to the resulting calcium oxide to make cement and concrete for building materials.
The limestone cycle!
The Limestone Cycle!
Here is a less visual explanation for those of you who are not visual learners.
1) Calcium Carbonate --> Carbon dioxide + Calcium Oxide
CaCO3 --> CO2 + CaO
2) Calcium Oxide + Water --> Calcium Hydroxide
CaO + H2O --> Ca(OH)2
3) Calcium Hydroxide + Carbon dioxide --> Water + Calcium Carbonate
Ca(OH)2 + CO2 --> H2O + CaCO3
What is Thermal Decomposition?
Thermal decomposition is heating something to break it down, in this case Calcium Carbonate into Calcium Oxide and Carbon dioxide. CaCO --> CaO + CO2.