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Water — Revision Notes

ICSE · Class 9 · Chemistry

Water revision notes for ICSE Class 9 Chemistry: 4 topics in quick points. Part of the ICSE Class 9 Chemistry syllabus.

43 questions36 flashcards10 formulas & key relations5 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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Key Topics to Revise

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.

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Full Notes

Key Concepts

Water has formula H2OWater dissolves many substances because itsA solution is a homogeneous mixtureA saturated solution cannot dissolve anySolubility is the maximum number

Frequently Asked Questions

What are the important topics in Water for ICSE Class 9 Chemistry?
Key topics in Water include Water: Basic Facts and Physical Properties, Water as a Universal Solvent and Solutions, Solubility, Concentration, and Solubility Curves, Crystals, Hydrated and Anhydrous Substances. Study these first, then practise questions on each for Class 9 exams.
How should I revise Water for Class 9 exams?
Learn the core ideas first, then work through the 43 practice questions on Water. Revise 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.

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