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2- Sometimes, scientists make new materials
Mixture doesn’t
by mixing different materials. combine chemically.
a) Steel: it is strong and lasts for a long time.
It is made of iron & other elements
b) Concrete: it is strong and used as the base of buildings and
bridges.
It is made of a mixture of rock, sand and water.
It is a liquid until it dries and becomes hard.
3- Sometimes, new materials are created
by chemical change so, properties change.
Plastic (tough solid and resists burning) is made by chemical
change of some of petroleum compounds (liquid and burns easily)
Tough solid and Chemical Change Liquid burns
resist burning. easily.
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First Term
