Classification enables us to keep hold of more
information and, if it is based on the right data,
enables us to understand better the ideas we are
studying. Chemists are no exception. The chemical
classification of materials, if it is based on a good
system, should enable us to understand better the
many substances which exist in our word. What is
to be the basis of our classification? Perhaps the
most obvious one is appearance.
Materials could be classified as solid, liquid
or gas with some mixed types as, for example, mud
being solid/liquid material and steam a liquid/gas
material. Appearance could enable us to subdivide
our main classification groups a little further; the
solid may be green, or black, powdery or crystalline; the liquid may be colored, oily, thick, or free flowing; the gas may be colored.
However, we soon realize that many probably quite different
materials have the same appearance. Both air and
the deadly carbon-monoxide gas, are colorless,
odorless gases, but we would not like to group them
as the same thing. Many different liquids are
colorless, water-like materials
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5.The examples provided in paragraph 2
clarify that ....
A. many kinds of liquid should be grouped
as one
B. different kinds of gas can be colorless and
odorless
C. Materials in chemistry should be
classified differently
D. Chemistry materials have more
complicated classification
E. Taxonomy can be made and applied
further to other areas.
6.The paragraph following the passage most
likely deals with the classification of...
A. flora and fauna
B. human sounds
C. liquid and gas
D. word and phrases
E. telecommunication system
7.The animal is categorized as mammals,
namely ...
A. Frog
B. camel
C. chicken
D. crocodile
E. boa
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