1 - 7
Chemical properties
These describe what chemical reactions are likely to occur.
We can observe how a
sample reacts when mixed with other chemicals (water, acid).
A material that can burn is
described as flammable. Some materials rust (a type of oxidation reaction).
Some materials
dissolve in water or other liquids.
Usually a chemical reaction involves a transformation of the sample into a different
substance, and it may be difficult to reverse the process. For example, wood is flammable.
When it burns it combines with oxygen from the air. The reaction produces ashes, smoke and
water; it cannot be reversed to make wood. The products of the reaction have quite different
properties from the original wood.
Characteristic Properties of Major Classes
metals
polymers
ceramics
hard but malleable
stiff or flexible
hard but brittle
shiny
dull
shiny if glazed
little color
colorless
many colors
intermediate
low melting
highest melting point
conduct electricity
nonconductive
nonconductive
high density
low density
intermediate density
difficult to burn
flammable
not flammable
COMPOSITION
Dostları ilə paylaş: