50-51 - Limestone Flashcards
What is the symbol for calcium carbonate?
CaCO3
How is limestone gathered?
It is quarried from the ground
What happens when limestone is heated?
Calcium oxide and carbon dioxide are produced
Thermal decomposition:
CaCO3 -> ___ + ___
CaO + CO2
Thermal decomposition:
MgCO3 -> ___ + ___
MgO + CO2
What happens when calcium carbonate reacts with acid?
Produces calcium salt, CO2, and water
Calcium carbonate + sulfuric acid -> ___ + ___ + ___
Calcium sulfate + carbon dioxide + water
Name two carbonates that react with acids
Magnesium, calcium, copper, zinc and sodium
How is calcium hydroxide produced?
When calcium oxide reacts with water
What is the symbol for calcium hydroxide?
Ca(OH)2
What can calcium hydroxide be used for?
To neutralise acidic lakes and soils
What is limewater?
The solution of calcium hydroxide in water
What is the CO2 test?
Limewater turning from clear to cloudy
What causes the cloudiness in the carbon dioxide test?
The formation of calcium carbonate
What can be made from limestone?
Cement
Mortar
Concrete
Name three disadvantages of quarrying limestone
The landscape looks ugly
Noise
Dust
Destroyed habitats
Pollution due to transportation
Name three advantages of quarrying limestone
Essential for building houses/roads
Can neutralise acidic soils
Sulfur dioxide can be neutralised in chimneys before acid rain
Jobs are provided
Economic benefit leads to local improvements
Restoration and landscaping does later take place
What is the chemical name for limestone?
Calcium carbonate
What are four advantages of limestone products?
Limestone is abundant
Cheap
Easy to cut
Hard wearing but still attractive
Can be moulded
Doesn’t rot or corrode
Not affected by insects/rodents
What is cement?
Powdered limestone heated with powdered clay
What is mortar?
Cement, sand, and water
Used to stick bricks together
What is concrete?
Cement, sand, and aggregate
