Page 66 - SCERT Kerala State Syllabus 8th Standard Basic Science Textbooks English Medium Part 1_Neat

Significant learning outcomes

The learner can
• explain the peculiarities of materials.

• classify materials by identifying the different states of matter
and their characteristic properties.
• identify and picturise the arrangement of particles in
different states of matter.
• explain the property of diffusion in liquid and gaseous
states, and make use of it in daily life.
• distinguish pure substances and mixtures and tabulate
them.
• separate components of a mixture on the basis of their
characteristic properties.
• explain the various methods used for separating
components from mixtures and make use of them in daily
life.
Let us assess

1. A few mixtures are given below. Tabulate the methods to
separate their components and give the reasons for selecting
the method.

Mixture Method Reason

Common salt and ammonium
chloride
Sugar solution

Petrol and Kerosene
Camphor and glass powder

Iron powder and sand

2. Given below are certain changes taking place to the particles
during change of state. From this, find out and tabulate the
changes in the particles when water boils to form steam and
also when steam condenses to form water.

distance increases
attractive force decreases

energy increases

Basic Science VIII
Basic Science VIII 65 65