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Short Notes - Is Matter Around Us Pure, Science, Class 9 Class 9 Notes | EduRev

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Short Notes - Is Matter Around Us Pure, Science, Class 9 Class 9 Notes | EduRev

Short Notes - Is Matter Around Us Pure, Science, Class 9 Class 9 Notes | EduRev

Short Notes - Is Matter Around Us Pure, Science, Class 9 Class 9 Notes | EduRev

  •  Compounds
    Compound     is a pure substance made up of two or more elements combined chemically in a definite ratio.

Characteristics:

1. The properties of compound differ from those of its constituents.
2. Compound has fixed melting point and boiling point.
3. Compound is a homogeneous substance.
4. Constituent elements can be separated by chemical process.

  • Mixtures: It is made up of two or more elements or compounds mixed in any ratio/proportion.

Properties:

  • It may be homogeneous or heterogeneous.
  • The properties of constituent substances are retained.
  • No new compound is formed.
  • Constituents of a mixture can be separated by simple physical processes.
  • It does not have fixed melting and boiling point.

Separation of Mixtures:

Type of Mixture Separation method
1. Two immiscible liquids. Example, oil + water By using separating funnel
2. Ammonium chloride + sand Sublimation
3. Dyes in black ink. (One solvent; different constituents) Chromatography
4. Two miscible liquids. (Acetone + water} Distillation
5. Solid particles insoluble from (solvent) liquid. (Milk + Cream) Centrifugation

Physical and Chemical Change​

Physical Change Chemical Change
  • No new substance is formed.
 A new substance is formed.
  • Properties of constituent elements/ substance is retained.
 Properties of constituent elements/substance changes.
  • Change does not involve loss or gain of heat.
 Loss or gain of heat may be involved in this reaction.
  • This change is generally reversible.
 This change is generally irreversible (can be reversible also).
  • Solution : It is a homogeneous mixture of two or more substances.
Solute Solute Solvent
A substance which is dissolved in a solvent. E.g., salt, sugar. Liquid part of solution in which a substance is dissolved. E.g., water.
Solute can be solid, liquid or gas. Solvent can be liquid, solid or gas.

Short Notes - Is Matter Around Us Pure, Science, Class 9 Class 9 Notes | EduRev

Short Notes - Is Matter Around Us Pure, Science, Class 9 Class 9 Notes | EduRev

Suspension Colloidal Solution
  • Size of solute particles are visible with naked eyes
 Size of solute particles are not visible with naked eyes.
  • Shows tyndall effect
 Shows tyndall effect
  • Translucent or opaque
 Translucent
  • Solute particles settle down
 Colloidal particles do not settle down


Short Notes - Is Matter Around Us Pure, Science, Class 9 Class 9 Notes | EduRev

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