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Water — Revision Notes

ICSE · Class 6 · Chemistry

Water revision notes for ICSE Class 6 Chemistry: 4 topics in quick points. Part of the ICSE Class 6 Chemistry syllabus.

50 questions30 flashcards5 concepts

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Key Topics to Revise

1

1. Introduction to Water

  • Water is a compound made of hydrogen and oxygen with the chemical formula H₂O.
  • It was once thought to be an element, but Henry Cavendish proved it is a compound in 1781.
  • One molecule of water contains 2 hydrogen atoms and 1 oxygen atom.
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2. Occurrence and States of Water

  • 70% of Earth's surface is covered with water, but only 1% is usable by living beings.
  • Water exists in three states: solid (ice), liquid (water), and gas (water vapour).
  • In nature, water is found in oceans (97%), glaciers (2%), and rivers/lakes/groundwater (1%).
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3. Sources of Water

  • Main sources: Surface water (rivers, lakes, oceans), Underground water (wells, springs), Atmospheric water (rain).
  • Rainwater is the purest natural form of water.
  • Sea water is saline and not fit for drinking or irrigation.
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4. Water as a Universal Solvent

  • Water can dissolve many solids, liquids, and gases, so it is called a universal solvent.
  • A solution has two parts: solute (substance dissolved) and solvent (liquid in which it dissolves).
  • Solutions are homogeneous mixtures.

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Full Notes

Key Concepts

Water is not an element butWater exists in three physical statesWater can dissolve many substances likeThe water cycle is the continuousNatural water contains impurities and germs

Frequently Asked Questions

What are the important topics in Water for ICSE Class 6 Chemistry?
Key topics in Water include Introduction to Water, Occurrence and States of Water, Sources of Water, Water as a Universal Solvent. Study these first, then practise questions on each for Class 6 exams.
How should I revise Water for Class 6 exams?
Learn the core ideas first, then work through the 50 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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