Question

such as
point, e
PURE SUBS
A subs
which has c
called a pur
Pure su
elements
INTRODUCTION
In the previous chapter you have learnt
that all substances are made up of matter. On
the basis of its state, matter can be a solid,
liquid or gas although they may contain the
same kind of matter.
For example : Water, water vapour and
ice are the three states of the same kind of
matter.
Classification of matter can also be done
on the basis of some similarities and
dissimilarities in their chemical composition.
For example :
Salt and sugar both are solids but
they differ from each other because
they are made up of different kinds of
Element:
atoms an
one kind
• They has
i.e., they
• They ha
chemica
• They ha
Pure sul
odour ai
Pure su
simpler
atoms.
Water and oil are both liquids but their
matter differs from each other.
The substances made up of different
kinds of matter may be pure or impure,
homogeneous (uniformly mixed) or
heterogeneous (distinct from each other).
A substance in which some other
substances are also present in smaller
amounts is called an impure substance.
The purity of a substance can be
checked by measuring or examining
some of its characteristic properties
For ex
it has a fi
freezes at
in it, the
temperatu
temperatur
ELEMENT
MATTER
Living
(Plants and animals)
Non-living
[Natural and man-made)
To be dealt
in biology
Pure substances
Mixtures
(always homogeneous) (Impure substances)
There
world. Bu
number
substanc
hydrogen
gold, iron
elements
Elements
Compounds
Homogeneous Heterogeneous
Metals Non-metals Metalloids Noble gases​

Answer 1

Answer:

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