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COLLOIDS
The document discusses colloids, which have particle sizes between 1-100 nm and bridge the gap between solutions and suspensions. Colloids scatter light so a beam of light passing through one will be visible, unlike with solutions where the beam remains invisible. Colloids exhibit Brownian motion, with particles moving rapidly and randomly through the dispersion medium.
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COLLOIDS
- 2. • Have particleswhose sizes are between 1 to 100 nanometers (1 nm = 10-9 m). • Bridge the gap between solutions and suspensions.
- 3. PROPERTY SOLUTION COLLOIDSUSPENSION Particle size Appearance Separation Filterability Example Less than 1 nm 1 to 100 nm More than 100 nm Clear Cloudy Cloudy Does not separate Does not separate Separates or settles Passes through filter paper Passes through filter paper Particles do not pass through filter paper Salt solution Starch solution Muddy water
- 4. Analogous to thesolute in a solution.
- 5. Analogous to thesolvent in a solution. It is the substance in which the colloidal particles are distributed.
- 7. Dispersed particles Dispersion medium Name Examples Liquid Gas Liquid aerosol Clouds, fog, mist, hair spray, deodorant spray Solid Gas Solid aerosol Smoke, dust in air
- 8. Dispersed particles Dispersion medium Name Examples Gas Solid Solid Foam Marshmallows, rubber foam Gas Liquid Foam Beaten egg white, shaving cream, whipped cream ice-cream soda
- 9. Dispersed particles Dispersion medium Name Examples Liquid Liquid Emulsion Milk, mayonnaise, blood
- 10. Dispersed particles Dispersion medium Name Examples Solid Liquid Sol Paint, starch mixture, hot chocolate, gelatin Solid Solid Solid Sol Colored glass, gems like ruby and garnet
- 11. Dispersed particles Dispersion medium Name Examples Liquid Solid Gel Cheese, butter, margarine
- 14. The ability of a colloid to scatter light so that the beam of light becomes visible.
- 15. The beam oflight is not visible. (solution) The beam of light is visible. (colloid)
- 17. If a colloidis viewed under a special microscope, the dispersed particles will be seen moving in a rapid, random, zigzag motion through the dispersion medium. www.youtube.com/watch?v=K-T9X6FUehM
- 18. The ability ofa substance to physically hold another substance on its surface is called ADSORPTION.
- 20. Colloidal particles adsorbions present in the dispersion medium. Depending on the type of colloid, the particles attract either positive or negative ions only not both.
- 23. Answer the following: A. Give the difference between each pair of terms: 1. Solution and colloid 2. Osmosis and dialysis 3. Solute and dispersed particle 4. Solvent and dispersion medium B. Classify the following colloids: 1. Fog 2. Gelatin 3. Mayonnaise 4. Milk 5. Mist