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Matter around us

Tamil Nadu Board · Class 9 · Science

Quick revision notes for Matter around us — Tamil Nadu Board Class 9 Science. Key concepts, formulas, and definitions for last-minute revision.

45 questions28 flashcards5 concepts

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A hierarchical flowchart illustrating the complete classification of matter, starting from 'Matter' and branching into 'Physical Classification' (Solids, Liquids, Gases, Plasma, Bose-Einstein Condensa
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Key Topics to Revise

1

1. Definition and Basic Concepts of Matter

  • Matter is anything that has mass and occupies space
  • All objects around us - air, water, food, stones, plants, animals - are matter
  • Non-matter examples: sunlight, sound, force, and energy (they don't have mass or occupy space)
2

2. Elements - Building Blocks of Matter

  • Elements are the simplest substances that cannot be broken down further chemically
  • Each element is made up of only one kind of atom
  • There are 118 known elements: 92 naturally occurring and 26 artificially created
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3. Compounds - Combinations of Elements

  • Compounds are formed when two or more elements combine chemically in fixed proportions
  • A compound is a new substance with completely different properties from its constituent elements
  • Compounds have a fixed chemical formula (e.g., water is H₂O, table salt is NaCl, sugar is C₁₂H₂₂O₁₁)
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4. Mixtures - Physical Combinations

  • A mixture is formed when two or more substances are physically combined in any proportion
  • Mixtures contain two or more kinds of particles but are NOT chemically bonded
  • Components of a mixture retain their individual properties

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Full Notes

Key Concepts

Matter is defined as anythingElements are the simplest pure substancesCompounds are pure substances formed whenMixtures are impure substances containing twoHomogeneous mixtures have uniform composition throughout

Frequently Asked Questions

What are the important topics in Matter around us for Tamil Nadu Board Class 9 Science?
Key topics in Matter around us include Matter Classification Overview, Mind map showing the hierarchical classification of matter into pure substances (elements and compounds) and mixtures (homogeneous and heterogeneous), Flowchart showing the properties and characteristics of elements. These are the concepts Tamil Nadu Board Class 9 examiners draw on most — study them first, then practise related questions.
How to score full marks in Matter around us — Tamil Nadu Board Class 9 Science?
Understand the core concepts first, then work through the 45 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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All 10 chapters — Tamil Nadu Board Class 9 Science Revision Notes

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