Page 168 - ICSE Chemistry 8

8 Water

Learning Outcomes Key Concepts
Students will be able to
• Water—A Revision
• describe that water dissolves many substances and it is a universal
solvent. • Physical Properties of
Water
• iden fy a solu on, suspension and colloid on the basis of proper es.
• Dissolution of Salts in
• state the diff erences between saturated, unsaturated and supersaturated
solu ons. Water
• True Solution,
• describe water of crystallisa on.
Suspension and Colloid
• write equa ons of metals with cold water and steam.
• Water of Crystallisation
• describe hard and so water.
• Chemical Properties of
• discuss the diff erent methods of so ening of water. Water
• Hard Water and
Soft Water

Warm Up Activity

Write the chemical formula of water. _______________
Write any three things for which you use water.
_______________ _______________ _______________

Write three ways in which you can save water.
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WATER—A REVISION

Water covers about 71% of the earth’s surface. Water is essen al
for survival and existence of all living organisms. Most life processes
in living beings are carried out in the presence of water. About 70%
of human body is composed of water. It helps to regulate the body
temperature by elimina ng wastes from our body. Water helps in the
absorp on of digested food and transports nutrients to various parts
of the body. Fig. 8.1: Water

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