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…

By Syllab.in · Updated Jun 17, 2026

Key Questions Covered:

Define matter and list its three states with one example each.
What is the difference between physical and chemical change? Give one example…
A pure substance is homogeneous. Explain with example.
Why are gases more compressible than solids?
Define density and calculate density of a substance with mass 50 g and volume…

Solutions Summary:

Question	Status
Define matter and list its three states with one example …	✓ Solved
What is the difference between physical and chemical chan…	✓ Solved
A pure substance is homogeneous. Explain with example.	✓ Solved
Why are gases more compressible than solids?	✓ Solved
Define density and calculate density of a substance with …	✓ Solved

Showing 5 of 5 questions

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.

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