شرح درس
Mixtures Properties
CHEMISTRY - Secondary 1
In This part we will study
Previously, the mixtures are classified into:
 Solutions.  Suspensions.  Colloids.
Following, their physical properties will be discussed.
 Solutions:
Solution: is a homogeneous mixture in which the diameter of the particles is smaller than. 1 nm
Properties of solution:
 Homogeneous mixture.
 The diameter of its particles (ions or molecules) is Jess than 1 nm.
 The particles of solution can’t be distinguished by the naked eye or by the electron microscope.
 The particles forming the solution are regularly distributed. So, the solution is homogeneous in its composition and properties.
 The particles don't scatter the beam of light passing through the solution.

 Suspensions:
Suspension: It is a heterogeneous mixture in which the diameter of its particles is larger than 1000 nm and can be distinguished by the naked eye.
Properties of suspensions:
 A heterogeneous mixture.
 The diameter of its particles is larger than 1000 nm.
 The suspended particles precipitate, if it is left for a short time without shaking.
 The suspended particles can be seen by the naked eye.
 The suspended particles can be separated by filtration, where the filter paper (ultra filtration membrane) can hold the suspended particles, while water passes through it.

Examples
 Sand in water.
 Chalk's powder in water.


Colloid: It is a heterogeneous mixture in which the diameter of its dispersed particles ranges between 1: 1000 nm and can be distinguished by the electron microscope.
Properties of colloids:
 A heterogeneous mixture (apparently homogeneous).
 The diameter of the dispersed particles is 1: 1000 nm.
 The dispersed particles don't precipitate, if they are left without shaking.
 The dispersed particles can be seen under microscope only.
 The dispersed particles can't be separated by filtration.
 The shape depends on its concentration:
• Concentrated colloids appear as milk or clouds.
• Diluted colloids appear clear.


Best wishes to you
Mr.Ahmed Elbasha

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