Matter Exemplar — Class 9 Science NCERT Solutions (Free)
Free step-by-step NCERT solutions for Class 9 Science chapter "Matter Exemplar" — 5 important questions with detailed answers for CBSE board exam preparation.
TL;DR: Free step-by-step NCERT solutions for Class 9 Science chapter "Matter Exemplar" — 5 important questions with detailed answers for CBSE board exam prep…
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NCERT Solutions for Class 9 Science — Matter Exemplar. Step-by-step answers to all 5 textbook questions from this chapter, written for CBSE board preparation and free to use.
Matter Exemplar — All 5 Questions Solved
Q1. Define matter and list its three states with one example each.
Matter is anything that has mass and occupies space. Three states: (1) Solid - has fixed shape and volume, example: iron block. (2) Liquid - has fixed volume but takes shape of container, example: water. (3) Gas - has neither fixed shape nor volume, expands to fill container, example: oxygen.
Q2. What is the difference between physical and chemical change? Give one example of each.
Physical change: property of matter changes but substance remains same, reversible, no new substance formed, example: melting of ice. Chemical change: new substances with new properties are formed, irreversible, example: burning of wood (produces ash and gases).
Q3. A pure substance is homogeneous. Explain with example.
A pure substance has uniform composition throughout and constant properties. Example: distilled water - everywhere in the water, composition is H2O and properties like boiling point (100°C) are constant. Unlike a mixture like salt solution where composition can vary.
Q4. Why are gases more compressible than solids?
Gases have large spaces between particles due to weak intermolecular forces. When pressure is applied, particles move closer, reducing volume significantly. Solids have particles closely packed with strong intermolecular forces, so applying pressure causes minimal reduction in volume.
Q5. Define density and calculate density of a substance with mass 50 g and volume 10 cm³.
Density is mass per unit volume: ρ = m/V. Given m = 50 g and V = 10 cm³. Therefore ρ = 50/10 = 5 g/cm³.
How to Use These Solutions
Attempt each question yourself first and only then compare with the worked answer. Marks in the CBSE board exam are awarded for the METHOD as much as the final result, so reproduce the steps rather than memorising the last line. Where a solution states a law, a formula or a definition, learn that wording — examiners look for it.
Related practice for this chapter: chapter MCQs, previous-year questions, revision notes and sample papers.