Limestone Flashcards
What are some uses of limestone? (There are 5/6)
Building stones Cement Broken up for roads or concrete Buildings or road 'chippings' Neutralises excess gases in lakes of soils Other industrial process
What are disadvantages to limestone quarrying? (4)
Can spoil natural beauty of the countryside
Creates heavy traffic for the area, which can be dangerous to the community and bad for the environment because of CO2 emissions.
Quarrying limestone releases CO2 into the atmosphere
Causes noise pollution for local residents, due to it having to be blasted out of cliffs
How do limestone quarries work?
Limestone is blasted out of cliffs, and extracted using thermal decomposition
How much limestone is extracted per year in Britain?
90 million tonnes
What are advantages to limestone quarrying? (3)
Limestone can be used for many different purposes
Can provide many economic opportunities and create jobs
Brings profit to Britain - 90 million tonnes extracted per year
What compound is limestone?
Calcium carbonate
What is the chemical formula for limestone?
CaCO3 (little 3)
How is limestone’s compound arranged?
Like a crystal lattice
How does thermal decomposition work?
1) If heated strongly, the compound of calcium carbonate breaks up and the atoms are rearranged
2) The carbon atom takes two oxygen atoms to form carbon dioxide
3) The calcium atom is left with just one oxygen atom, and makes oxygen oxide, also called quicklime
What are the four compounds in the lime cycle?
Calcium Carbonate, Calcium Oxide (and Carbon Dioxide), Calcium Hydroxide, Limewater
What do you have to add to Calcium Carbonate to get to Calcium Oxide (and Carbon Dioxide)?
Heat
What do you have to add to Calcium Oxide to get to Calcium Hydroxide?
Water (H2O)
What do you have to add to Calcium Hydroxide to get to limewater?
Water (H2O)
What do you have to add to limewater to get Calcium Carbonate?
Carbon dioxide (CO2)