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Jumat, 04 Januari 2013


The classify of colloid systems


Standard Competence      : 4. Describe the characteristic of solution, measurement method and its application

Basic Competence            : 4.8 Group the colloid systems based on the experiment result and the useful in industry

 Indicator 
a.       Analyze the differences of true solution, colloid, and suspension
b.      Analyze the kinds of colloid system

Materials



Colloid is derived from Greek kolla, meaning glue. Old time glues were colloidal dispersions in water. Colloids, also called colloidal dispersions or colloidal suspensions, are mixtures that are intermediate between true solutions and suspensions. Because of the way the size of colloidal particles compare to the dimensions of the particles of the medium in which they are distributed, we don’t use the terms solute and solvent. Instead, we refer to the dispersed phase and the dispersing medium. Dispersed phase is a substance which is dispersed, while dispersing medium is the medium which used to disperse.
Table 1.1.  The differences of solution, colloid, and suspension

SOLUTION
COLLOID
SUSPENSION
Ex : sugar solution in water
Ex : milk mixture in water
Ex : starch mixture in water
1.       Homogeneous, can not be differentiated although use ultra microscope


2.       All particles have dimension (length, width, tick) less than 1 nm
3.       One phase
4.       Stable
5.       Can not be filtered
1.       Under microscope has homogeneous properties but under ultra microscope has heterogeneous properties
2.       Particles has dimension between 1 nm until 100 nm
3.       Two phases
4.       Generally stable
5.       Can not be filtered except use ultra filter
1.       Heterogeneous




2.       One of particles or all particles have dimension more then 100 nm
3.       Two phases
4.       Not stable
5.       Can be filtered

            Table 1.2.  Types of colloidal dispersions      
Dispersing Medium
Dispersed Phase
Colloid Type
Examples
Solid
Solid
Solid sol
Pearls
Solid
Liquid
Solid emulsion
Cheese
Solid
Gas
Solid foam
Marshmallow
Liquid
Solid
Sol, gel
Paint
Liquid
Liquid
Emulsion
Milk
Liquid
Gas
Foam
Whipped cream
Gas
Solid
Solid aerosols
Smoke
Gas
Liquid
Liquid aerosols
Clouds

Question:
No
Dispersing Medium
Dispersed Phase
Colloid Tape
Examples
1.
Solid
Solid
Pearl, Opals
2.
Solid
Liquid
Solid emulsion
3.
Solid
Solid foam
Marshmallow, pumice
4.
Liquid
Solid
Sol, Gel

5.
Liquid
Liquid
Emulsion
6.
Gas
Foam
Whipped cream, shaving cream
7.
Gas
Solid
Smoke, dust
8.
Gas
Liquid aerosols
Clouds, mist, fog



















Answers :

No
Dispersing Medium
Dispersed Phase
Colloid Tape
Examples
1.
Solid
Solid
Solid sol
Pearl, Opals
2.
Solid
Liquid
Solid emulsion
Cheese, butter
3.
Solid
Gas
Solid foam
Marshmallow, pumice
4.
Liquid
Solid
Sol, Gel
 Jelly, starch in water, paint
5.
Liquid
Liquid
Emulsion
Milk, ice cream, mayonnaise, lotion
6.
Liquid
Gas
Foam
Whipped cream, shaving cream
7.
Gas
Solid
Solid aerosols
Smoke, dust
8.
Gas
Liquid
Liquid aerosols
Clouds, mist, fog
























TOTAL SCORE : 8 x 10 = 80












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