Limestone Cycle Flashcards
Limestone chemical name
Calcium carbonate
CaCO3
Quicklime chemical formula
Calcium oxide
CaO
Slaked lime
Calcium hydroxide
Ca(OH)2
Limewater
Calcium hydroxide
Ca(OH)2
Thermal decomposition
Limestone —> calcium oxide
CaCO3 —> CaO + CO2
What physical effect does heating calcium carbonate show
It glows
What happens to green copper sulfate when it is heated
Turns black
Describe a practical experiment to demonstrate carbon dioxide is given off when metal carbonates are heated
1) Heat metal carbonate in a boiling tube
2) bubble the gas produced through limewater
3) if it turns cloudy CO2 is present
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Potassium, sodium, calcium, magnesium, aluminium, carbon, zinc, iron, tin, lead, hydrogen, copper, silver, gold, platinum
How does the reactivity of metal affect the stability of metal carbonate
The more reactive the metal, the more stable the metal carbonate
Will sodium carbonate decompose with use of a Bunsen burner
No
Quicklime —> slaked lime
CaO + H2O —> Ca(OH)2
Exothermic reaction
Produces steam
Describe Slaked lime —> limewater reaction
- Exothermic - produces steam
- hisses
Limewater —> limestone symbol equation
Ca(OH)2 + CO2 —> CaCO3 + H2O
Uses of limestone (4)
- neutralise soil acidity
- make cement
- production of iron and steel
- road building
How is limestone used in extraction of iron
It removes impurities as it forms slag that is less dense than iron so it floats on top
Limestone quarrying advantages explained (3)
- vital building material - sold to improve local economy
- provides employment - improve local economy
- roads and transport needed to transport limestone improve local transportation
Disadvantages of quarrying limestone explained (5)
- blasting causes noise and air pollution
- dust causes increased number of respiratory conditions
- transport of limestone causes increase in traffic
- destruction of landscape creates visual pollution
- destruction of landscape destroys wildlife habitats
What happens when metal carbonates are heated
They undergo thermal decomposition
What happens when metal carbonates thermally decompose
They form metal oxide and carbon dioxide
What pH is slaked lime
Alkaline

