Rocks and building materials SPEC Flashcards
(15 cards)
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)
