Using Limestone Flashcards
Limestone is mainly what?
Calcium carbonate.
Where does limestone come from?
Quarried out of the ground.
Formed from sea shells.
What is limestone good for making?
Blocks for building.
What buildings are usually made out of limestone?
Cathedrals made purely from limestone.
As its sturdy.
What is the equation for calcium carbonate?
CaCO3.
What happens when calcium carbonate is heated?
It thermally decomposes.
Makes calcium oxide and carbon dioxide.
What is thermal decomposition?
When one substance chemically changes into at least 2 new substances when heated.
Give the equation for
calcium carbonate——–> calcium oxide + carbon dioxide.
CaCO3 —->Ca0 + CO2.
Same 4 other substances which thermally decompose in the same way.
Sodium carbonates.
Magnesium.
Copper.
Zinc.
When heated what does magnesium carbonate make?
Magnesium oxide and carbon dioxide.
What can’t a bunsen burner do?
Reach high enough temperatures to thermally decompose some carbonates in Group 1 metals.
Calcium carbonate reaches with acid to produce what?
Calcium salt.
Carbon dioxide.
Water.
The type of salt produced depends on what?
The type of acid used.
If hydrocholric acid was used what type of salt would be produced?
Chloride.
Name other carbonates which react with acid.
Magnesium.
Copper.
Zinc.
Sodium.
What is limestone damaged by?
Acid rain.
What equation shows limestone is damaged by acid rain?
Calcium carbonate+Sulphuric acic —–> Calcium sulfate +carbon dioxide + water.
Calcium oxide reacts with water to produce what?
Calcium hydroxide.
What is calcium hydroxide?
An alkali used to neutralise acidic soil in a field.
Powered limestone can be used for this too.
Advantage of using calcium hydroxide is what?
It works quick.
What can calcium hydroxide be used to test for?
Carbon dioxide.
If you make a solution of calcium hydroxide in water what will happen?
If you bubble gas through it, it will turn cloudy if there’s carbon dioxide in the gas.
What is the cloudiness caused by?
Formation of calcium carbonate.
What is the equation for the lime water test/cloudy water?
calcium hydroxide + carbon dioxide —-> calcium carbonate + water.
Powered limestone is heated in what to make what?
A kiln.
With powered clay to make cement.
Have is a mortar made?
Cement mixed with sand and water.
What is mortar?
The stuff you stick bricks together with.
What can you also add to a motar?
Calcium hydroxide.
How do you make concrete?
Mixing sand and aggregate together.
