C1 A

Revision notes on the products of rocks for GCSE Chemistry.

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  • Created on: 12-04-08 15:55
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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 about 100 different types of atoms.
All the different types of atoms are shown in the periodic
Elements have very different properties.
There are groups and periods. Groups are the verticals
columns and the periods are the horizontal rows.
There are eight groups. (0, 1, 2, 3, 4, 5, 6, 7) the groups
contain elements with similar properties.
Not all substances around us are pure elements. Some are
compounds. A compound is a substance made of two or
more types of atoms chemically joined together.
An atom consists of a nucleus which has protons and
neutrons in them and it also has electrons whizzing around
Law of conversation of mass-matter can be neither created
nor destroyed but can be rearranged.
C1a 1.2 ­ Limestone and its uses and C1a 1.4 ­ Quicklime and
slaked lime and C1a 1.5 ­ Cement, Concrete and glass
Limestone is a rock made mainly of calcium carbonate.
Some forms of limestone were made from the remains of
tiny animals and plants that lived in the sea millions of
years ago.
We get limestone from quarries.
Limestone is used to make:

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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 on calcium hydroxide you make
limewater.…read more

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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 decompose when heated.
There is the same number of atoms on both sides of an
equation to balance it out.
Law of conversation of mass-matter can be neither created
nor destroyed but can be rearranged.…read more


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