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Water

ICSE · Class 9 · Chemistry

Complete topic list for Water in ICSE Class 9 Chemistry. Key concepts, sub-topics, and what to focus on for board exams.

43 questions36 flashcards5 concepts

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A diagram illustrating the arrangement and movement of particles in solid, liquid, and gaseous states of matter.
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4 Topics · ICSE Class 9 Chemistry

Topics in Water

1

1. Water: Basic Facts and Physical Properties

  • Water has formula H2O and molecular mass 18 amu.
  • Water exists as ice, liquid water, and steam.
  • More than 70% of Earth's area is occupied with water, but only about 2.5% of Earth's water is fresh water.
2

2. Water as a Universal Solvent and Solutions

  • Water dissolves many substances because of its high dielectric constant.
  • Water is called the universal solvent.
  • A solution is a homogeneous mixture of two or more components.
3

3. Solubility, Concentration, and Solubility Curves

  • Different substances dissolve to different extents in the same solvent.
  • At 40°C in 100 g water, the solubility of NaCl is 36.5 g and of KNO3 is 65 g.
  • At 20°C, the solubility of KNO3 is 31.6 g and at 60°C it is 63.9 g.
4

4. Crystals, Hydrated and Anhydrous Substances

  • A crystal is a homogeneous solid of definite geometrical shape.
  • Crystallization is the process by which crystals are obtained by cooling a hot saturated solution.
  • Some salts contain water of crystallization, which is an integral part of the crystal.

Key Concepts

Central concept: Water as a natural resource, universal solvent, and substance with important physical and chemical behavior

Water composition and identityWater in naturePhysical properties of waterWater as a universal solventSolutionsSolubilityAir dissolved in waterWater of crystallization

Frequently Asked Questions

What are the important topics in Water for ICSE Class 9 Chemistry?
Key topics in Water include Correct Classification of Water Absorption and Loss Phenomena, Chapter Overview: Water — Key Concepts, Chapter Water — Complete Concept Map. These are the concepts ICSE Class 9 examiners draw on most — study them first, then practise related questions.
How to score full marks in Water — ICSE Class 9 Chemistry?
Understand the core concepts first, then work through the 43 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Water

All 9 chapters — ICSE Class 9 Chemistry Syllabus

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