Headings Search Questions 
gcsescience.com 4 gcsescience.com
Elements, Compounds and Mixtures
Mixtures.
A mixture contains two
or more substances
which have not reacted chemically
with each other.
A mixture is made of little bits of each substance mixed together.
A mixture can be separated by physical methods, a compound can not.
For example
A mixture of iron filings and sulfur
can be separated by using a magnet to attract the iron.
Iron is a magnetic material but
sulphur is not.
If a mixture of iron filings and sulfur is heated
the iron reacts with the sulfur and the compound iron
sulfide is formed.
The compound iron sulfide is
not a magnetic material
and cannot be separated
by using a magnet.
Separation Techniques - Physical Methods.
1) Filtration
2) Crystallisation
3) Distillation
4) Chromatography
gcsescience.com Contents The Periodic Table Index Quizzes gcsescience.com
Copyright © 2008 Dr. Colin France. All Rights Reserved.