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Farah Khan 10BN

C1a. ­ Products from rocks
1. Rocks and building

C1a 1.1 ­ Atoms, elements and compounds
All substances are made up of atoms.

An atom is the smallest part of an element.

An element is a substance made up of only one type of

There are…

Page 2

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Farah Khan 10BN


Limestone is mainly calcium carbonate. When it is heated it
breaks down to form calcium oxide (quicklime) and a gas
called carbon dioxide. If you add a few drops of water to
calcium oxide, you form calcium hydroxide (slaked lime). If
you pour lots of water…

Page 3

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Farah Khan 10BN

Reinforced cement is stronger than normal cement. It is
normal cement that has been poured onto steel bars and
rods. It is used for slabs, walls, beams, columns and fences.

C1a 1.3 ­ Decomposing carbonates
Thermal decomposition:
Metal carbonate metal oxide + carbon dioxide

Not all carbonates…


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