worksheet colloid

WORKSHEET OF COLLOID

NAME  :_____________________

I. Competence Standards      : 5. Describe the system and the properties of colloid and its application in daily life.

 II. Basic Competence            : 5.1 To classify the properties of colloid and its application in daily life

III. Learning Material

            Colloids are mixtures whose particles are larger than the size of a molecule but smaller than particles that can be seen with the naked eye. Colloids are one of three major types of mixtures, the other two being solutions and suspensions. The three kinds of mixtures are distinguished by the size of the particles that make them up. The particles in a solution are about the size of molecules, approximately 1 nanometer (1 billionth of a meter) in diameter. Those that make up suspensions are larger than 1,000 nanometers. Finally, colloidal particles range in size between 1 and 1,000 nanometers. Colloids are also called colloidal dispersions because the particles of which they are made are dispersed, or spread out, through the mixture.ypes of lloids

            Colloids are common in everyday life. Some examples include whipped cream, mayonnaise, milk, butter, gelatin, jelly, muddy water, plaster, colored glass, and paper.

            Every colloid consists of two parts: colloidal particles and the dispersing medium. The dispersing medium is the substance in which the colloidal particles are distributed. In muddy water, for example, the colloidal particles are tiny grains of sand, silt, and clay. The dispersing medium is the water in which these particles are suspended.

            Colloids can be made from almost any combination of gas, liquid, and solid. The particles of which the colloid is made are called the dispersed material. Any colloid consisting of a solid dispersed in a gas is called a smoke. A liquid dispersed in a gas is referred to as a fog.

Dispersed Material	Dispersed in Gas	Dispersed in Liquid	Dispersed in Solid
Gas (bubbles)	Not possible	Foams: soda pop; whipped cream;	Solid foams: plaster; pumice
Liquid (droplets)	Fogs: mist; clouds; hair sprays	Emulsions: milk; blood; mayonnaise	butter; cheese
Solid (grains)	Smokes: dust; industrial smoke	Sols and gels: gelatin; muddy water; starch solution	Solid sol: pearl; colored glass; porcelain; paper

IV. Observation Procedure

·         Observe these colloid and classify them to their dispersed phase and disperding medium.

·      Write your observation in the table

Colloid	Dispersed phase	Dispersing medium	Colloid Type
Milk
Parfume Sprayer
Ink
Hair Oil
Cheese
Nail Polish
Lipstick

·        Conclusion

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Evaluation Test

1.      Complete the table below

No	dispersed phase	dispersing medium	Colloid types	Example
1			Sol
2	Gas	Liquid
3			Smoke
4				Alloys
5	Liquid	Gas
6			Emulsion

2.      Describes 3 examples of colloid in terms of cosmetic industry, foods industry and pharmaceutical!

Key of Evaluation Sheet

1. 

No	dispersed phase	dispersing medium	Colloid types	Example
1	Solid	Liquid	Sol	mud
2	Gas	Liquid	Foam	Whipped Cream
3	Solid	Gas	Smoke	Dust
4	Solid	Solid	Solid Sol	Alloys
5	Liquid	Gas	Liquid Aerosol	Fog
6	Liquid	Liquid	Emulsion	Milk

2.          -) Industrial food: butter, milk, gelatin, spices lettuce, cheese, bread

            -) Cosmetics: perfumes, deodorant spray, liquid to mask, nail polish, facial cleansing milk and skin, deodorant stick, hair oil (jelly), shaving soap, beauty soap, lipstick, eyebrow           pencil, mascara

            -) Pharmacy: syrup, medicine, capsule