Is Matter around us Pure?
Madhya Pradesh Board · Class 9 · Science
Quick revision notes for Is Matter around us Pure? — Madhya Pradesh Board Class 9 Science. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Pure Substances vs Mixtures
- For a scientist, pure means all constituent particles are the same in chemical nature
- A pure substance consists of a single type of particle
- Most matter around us exists as mixtures (sea water, minerals, soil)
Types of Mixtures
- Homogeneous mixtures: uniform composition throughout (solutions)
- Heterogeneous mixtures: non-uniform composition with physically distinct parts
- Examples of homogeneous: salt in water, sugar in water, copper sulphate solution
Solutions
- Solution = homogeneous mixture of solute + solvent
- Solvent: component in larger amount (dissolves other component)
- Solute: component in smaller amount (gets dissolved)
Suspensions
- Heterogeneous mixture where solids are dispersed in liquids
- Particles visible to naked eye (larger than 100 nm)
- Particles scatter light beam and make path visible
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