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Advanced Chemistry Notes

Advanced Chemistry Notes. Colloids. Colloids and Solutions. Recall : solutions were homogenous mixtures Suspensions are a heterogeneous mixture in which the particles eventually settle out. Ex: muddy water Colloids are intermediates of solutions and suspensions. Colloids.

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Advanced Chemistry Notes

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  1. Advanced Chemistry Notes Colloids

  2. Colloids and Solutions Recall: solutions were homogenous mixtures • Suspensions are a heterogeneous mixture in which the particles eventually settle out. • Ex: muddy water • Colloids are intermediates of solutions and suspensions.

  3. Colloids Colloids are defined as mixtures composed of two or more phases of matter. • Dispersed phase (colloid particles) - larger than the single particles of a solution but smaller than the particles of a suspension. • Continuous Phase – the dispersing medium

  4. Colloids

  5. Colloids and Solutions

  6. Classification of Colloids Colloids are based on the states of the dispersed and continuous phases • Aerosols – liquids and solids dispersed in gases • Ex: Smoke • Foams – gases dispersed in a liquid or a solid • Marshmallows; whipped cream

  7. Classification of Colloids Colloids are based on the states of the dispersed and continuous phases • Emulsions – liquids are dispersed in other liquids or in solids • Ex: Mayo, cheese, • Sols – dispersion of solids in liquids or other solids • Ex: paint, jelly, pearls

  8. Properties of Colloids Special properties of Colloids • Tyndall effect – the scattering of light by a colloid

  9. Properties of Colloids Special properties of Colloids • Brownian Motion – continuous random motion of colloid particles.

  10. Summary Be able to… • Define Colloid and Suspension • Explain how Colloids relate to Solutions and Suspensions in terms of particle size and permanence • Classify Colloids • Describe properties of Colloids

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