Limestone Flashcards
What is limestone formed from??
Seashells
- sedimentary rock (built up in layers) made from millions of years through the compression of shells and skeletons
What is limestones chemical name?
Calcium Carbonate
What are the 8 uses of limestone?
- Building materials
- Statues (made out of marble)
- Cement
- Mortar
- Concrete
- Glass
- Neutralising agent
- Pharmaceutical & industrial products-paint
What is the word equation for cement?
Limestone + clay —-> cement (powdery)
—>
Heat added
What is the word equation for mortar?
Cement + sand + water–> mortar
What is the word equation for concrete?
Cement + gravel + sand + water –> concrete
What is the word equation for glass?
Sand + limestone –> glass
–>
Heat added
What is the equation of the neutralisation reaction??
when calcium carbonate also reacts with acid
Calcium carbonate + sulfuric acid –> calcium dilate + carbon dioxide + water
CaCO3 + H2SO4 –> CaSO4 + CO2 + H2O
When limestone is heated up, what happens?
It thermally decomposes to make calcium oxide & carbon dioxide
CaCO3 –> CaO + CO2
What is the formula and salt of hydrochloric acid?
HCl , chloride
What is the formula and salt of sulphuric acid?
H2SO4 , sulphate
What is the formula and salt of nitric acid?
HNO3 , Nitrate
Recall the lime cycle
1) Calcium carbonate is heated (thermal decomposition) to produce calcium oxide and CO2
2) water is added to produce calcium hydroxide, CaO + H2O –> Ca(OH)2
3) More water is added to calcium hydroxide to produce limewater , –> Ca(OH)2 (aq)
4) CO2 is added to line water to produce limestone
Name the 4 stages/ products made in the lime cycle
1) Limestone- CaCO3
2) Quicklime- CaO
3) Slaked lime- Ca(OH)2
4) Limewater - Ca(OH)2 (aq)
What reaction is stage 3 of the lime cycle?
An exothermic reaction - gives out heat
What is the test for CO2?
Bubble CO2 through clear limewater and if it goes cloudy then CO2 is present
What are the advantages to quarrying Limestone??
1) It produces useful products such as building materials, glass and paint
2) it provides jobs
3) increases wealth of local economy
What is the chemical formula of limestone?
CaCO3
What are the disadvantages of quarrying Limestone?
1) It destroys habitats
2) it creates an aesthetically poor view-BLOT on landscape
3) Produces air-pollution (dust)
4) Produces noise pollution (tremors- structural damage)
5) The traffic congestion causes air-pollution and noise pollution
6) produces CO2 leading to climate change and global warming
