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Water

ICSE · Class 9 · Chemistry

Quick revision notes for Water — ICSE Class 9 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

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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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 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.

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