Advanced Chemistry Notes Colloids. Colloids and Solutions Recall: solutions were homogenous mixtures  Suspensions are a heterogeneous mixture in which.

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Presentation transcript:

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 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

Colloids

Colloids and Solutions Comparison of Solutions, Suspensions and Colloids Type Particle Size Permanence Solution < 1 nm Permanent Colloid > 1 nm but 1 nm but < 100 nmPermanent Suspension > 100 nm Settles out

Classification of Colloids Colloids are based on the states of the dispersed and continuous phases 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

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

Properties of Colloids Special properties of Colloids  Tyndall effect – the scattering of light by a colloid

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

Properties of Solutions, Colloids and Suspensions SolutionColloidsSuspensions Don’t settle Settles Doesn’t scatter light Scatters light Unaffected by membranes Separated by membrane Pass through filter paper unchanged Separated by filter paper

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