Rocks and building materials SPEC Flashcards
What is the main component of limestone?
Calcium carbonate
CaCO3
What is the product of the THERMAL DECOMPOSTION of calcium carbonate?
Calcium oxide + carbon dioxide
CaCO3 –> CaO + CO2
Not all carbonates of
metals in Group 1 decompose at the temperatures reached by a Bunsen burner.
(y)
Carbonates of which element decompose in the same way with calcium carbonate?
(Product: Carbon dioxide + metal oxide)
Magnesium, copper, zinc, sodium
MgCO3 –> MgO + CO2
What is the product of calcium oxide with water?
CaO + H2O –> ?
Calcium hydroxide
CaO + H2O → Ca(OH)2
What is calcium hydroxide and what is its use?
Ca(OH)2
Alkali
Neutralisation of acids
What is a solution of calcium hydroxide in water called?
Ca(OH)2 (aq)
Limewater
Ca(OH)2 (aq)
What is the product of reaction of limewater with carbon dioxide?
Ca(OH)2 (aq) + CO2(g) —> ?
Calcium carbonate
Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l)
Describe a test for the presence of CO2
Limewater turns cloudy
What is the product of carbonates reacting with acid?
CaCO3 (s) + HCl (aq) –> ?
Carbon dioxde, salt + water
CaCO3(s) + 2 HCl(aq) –> H2O(l) + CO2(g) + CaCl2(aq)
Why is limestone damaged by acid rain?
Calcium carbonate in limestone reacts with acid in the rain
How is cement made?
Heating limestone with clay
How is mortar made?
Cement + sand
How is concrete made?
Cement + sand + aggregate
Acids + carbonates –> salt + water + CO2
Which carbonates is this reaction limited to?
Magnesium, copper, zinc, calcium + sodium
MgCO3(s) + 2 HCl(aq) –> MgCl2(aq) + H2O(l) + CO2(g)
