Water
ICSE · Class 8 · Chemistry
Summary of Water for ICSE Class 8 Chemistry. Key concepts, important points, and chapter overview.
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Overview
Water is a very important natural resource and a universal solvent. It is essential for life, used in homes, farms, industries, and natural processes. Water exists as ice, liquid water, and water vapour. It dissolves many substances, forms different types of mixtures, shows unusual expansion on cool
Key Concepts
Water has the molecular formula H₂O
Water has the molecular formula H₂O and the chemical name Dihydrogen oxide. It is a compound of hydrogen and oxygen. The ratio of hydrogen and oxygen
Natural water comes from oceans
Natural water comes from oceans and seas, rivers and lakes, springs and wells, and rainwater. Rainwater is the purest form of natural water. Oceans an
Water dissolves many solids
Water dissolves many solids, liquids, and gases. A solution is a homogeneous mixture of solute and solvent. Salt in water is a solution. Water is call
A solution has particle size less
A solution has particle size less than 10⁻⁹ m and is homogeneous. A suspension has particle size about 10⁻⁶ m or more and settles down. A colloid has
A saturated solution cannot dissolve more
A saturated solution cannot dissolve more solute at a given temperature. An unsaturated solution can dissolve more solute. A supersaturated solution c
Learning Objectives
- Describe water as a compound made of hydrogen and oxygen.
- Explain why water is called a universal solvent.
- Differentiate between solution, suspension, and colloid.
- Identify saturated, unsaturated, and supersaturated solutions.
- Explain water of crystallisation and hydrated substances.
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