Calcium oxide is
useful for making
glass, cement and
limewater.
Calcium carbonate decomposes
to make calcium oxide and carbon
dioxide.
Limewater is calcium hydroxide
solution. When it reacts with carbon
dioxide, a cloudy precipitate of calcium
carbonate forms, because calcium
carbonate is insoluble.
In thermal decomposition
chemicals break down into more
than one substance when heated.
The reaction between calcium
oxide and water produces
calcium hydroxide.
Acidic soil can be made less
acidic by mixing it with calcium
carbonate, hydroxide, or oxide.
Calcium compounds are used
to stop sulfur dioxide getting into
the atmosphere.