Identify the dispersed phase and the dispersion medium in each of the following colloidal systems: starch dispersion, smoke, fog, pearl, whipped cream, floating soap, jelly, milk, and ruby.
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Chemistry 2e · 11.5 Colloids
Colloids: practice problems
3 problems from the book, with its answers. Check your working, or have any of them explained to you on the whiteboard.
Exercises 73
How do colloids differ from solutions with regard to dispersed particle size and homogeneity?
Exercises 75
How can it be demonstrated that colloidal particles are electrically charged?
Key terms · 9
- amphiphilic
- molecules possessing both hydrophobic (nonpolar) and a hydrophilic (polar) parts
- colloid
- (also, colloidal dispersion) mixture in which relatively large solid or liquid particles are dispersed uniformly throughout a gas, liquid, or solid
- dispersion medium
- solid, liquid, or gas in which colloidal particles are dispersed
- dispersed phase
- substance present as relatively large solid or liquid particles in a colloid
- emulsifying agent
- amphiphilic substance used to stabilize the particles of some emulsions
- emulsion
- colloid formed from immiscible liquids
- gel
- colloidal dispersion of a liquid in a solid
- suspension
- heterogeneous mixture in which relatively large component particles are temporarily dispersed but settle out over time
- Tyndall effect
- scattering of visible light by a colloidal dispersion
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