Page 61 - SCERT Kerala State Syllabus 8th Standard Basic Science Textbooks English Medium Part 1_Neat

of particles in these states. Each of the substances that we use are
made up of tiny particles. Depending on their nature, substances
can be classified into two.
1. Pure Substances 2. Mixtures

Molecules of water, common salt and gold have their own unique
properties. Materials made of particles of identical nature are
called pure substances. In saline water, both particles with
properties of salt and water are present. The substances made of
particles of different nature are called mixtures.
Classify the given materials into pure substances and
mixtures.
Gold, soda water, soil, water, ice, water vapour, sugar, common
salt, carbon dioxide, sugar solution and salt solution.

Pure Substance Mixture
$ Gold $ Soda water

$ $
$ $
$ $
$ $
Table 4.4

Expand the table by including more substances you know.

See 'Padarthangalude Vargeekaranam' in School
Resources in IT @ School Edubuntu.

Separating the Components of a Mixture

Most of the substances found in nature are mixtures. Eg:- soil,
sea water, rock powder, sand, river water and air. Think about
their components.
In daily life, we have occasions when components of mixtures
are to be separated.

Look at a few instances where components of mixtures are to be
separated: List out more of such intances.
separating husk (chaff) from paddy.

separating tea dreg from tea.
separating common salt from sea water.

Basic Science VIII
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