Download Class 9 Chemistry Concept Summaries: CBSE Class 9 Chemistry Is Matter Around Us Pure Notes Set 05
Review targeted revision notes for Class 9 Chemistry with the CBSE Class 9 Chemistry Is Matter Around Us Pure Notes Set 05. Built according to official educational guidelines for the 2026-27 academic year, these downloadable summaries for Is Matter Around Us Pure support daily study and last-minute exam readiness.
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Pure Substances and Mixtures
| Pure substance | Mixture | |
|---|---|---|
| Composition | One kind of particle, fixed composition | Two or more substances in any proportion |
| Examples | Elements and compounds: iron, water, salt | Air, sea water, soil, brass |
| Properties | Fixed melting and boiling point | Properties depend on the components and no fixed melting or boiling point |
| Separation | Only by chemical methods | By physical methods |
An element has one kind of atom (metals, non-metals and metalloids like silicon and germanium). A compound has two or more elements chemically combined in a fixed ratio by mass and has properties different from those of its elements. A homogeneous mixture (solution, alloy, air) has uniform composition and a heterogeneous mixture (sand and water, oil and water) does not.
Solutions, Suspensions and Colloids
| Property | True solution | Colloid | Suspension |
|---|---|---|---|
| Particle size | Less than 1 nm | 1 nm to 1000 nm | More than 1000 nm |
| Visible to eye | No | No (only under ultramicroscope) | Yes |
| Settling on standing | Does not settle | Does not settle | Settles |
| Filtration | Passes through filter paper | Passes through filter paper | Retained by filter paper |
| Tyndall effect | No | Yes | Yes (but turbid) |
| Examples | Salt in water, air | Milk, smoke, fog, ink, butter | Muddy water, chalk in water |
1. Concentration of a solution = mass of solute / mass of solution x 100 (mass percent) or volume of solute / volume of solution x 100 (volume percent).
2. A saturated solution cannot dissolve more solute at a given temperature, and an unsaturated one can. Solubility usually increases with temperature.
3. A colloid has two phases: the dispersed phase and the dispersion medium. Smoke is solid in gas, fog is liquid in gas, milk is liquid in liquid and butter is liquid in solid.
4. Brownian motion is the zig-zag motion of colloidal particles caused by collisions with the particles of the medium. Colloids are stable because the particles carry like charges, and coagulation (for example with alum) neutralises the charge.
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Study Material and Revision Notes for Class 9 Chemistry Is Matter Around Us Pure
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You can download the teacher prepared revision notes for CBSE Class 9 Chemistry Is Matter Around Us Pure Notes Set 05 from StudiesToday.com. These notes are designed as per 2026-27 academic session to help Class 9 students get the best study material for Chemistry.
Yes, our CBSE Class 9 Chemistry Is Matter Around Us Pure Notes Set 05 include 50% competency-based questions with focus on core logic, keyword definitions, and the practical application of Chemistry principles which is important for getting more marks in 2026 CBSE exams.
Yes, our CBSE Class 9 Chemistry Is Matter Around Us Pure Notes Set 05 provide a detailed, topic wise breakdown of the chapter. Fundamental definitions, complex numerical formulas and all topics of CBSE syllabus in Class 9 is covered.
These notes for Chemistry are organized into bullet points and easy-to-read charts. By using CBSE Class 9 Chemistry Is Matter Around Us Pure Notes Set 05, Class 9 students fast revise formulas, key definitions before the exams.
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