2. Section 3-3 Section 3.3 Mixtures of Matter Contrast mixtures and substances. Classify mixtures as homogeneous or heterogeneous. List and describe several techniques used to separate mixtures.

3. substance: a form of matter that has a uniform and unchanging composition; also known as a pure substance

4. Section 3-3 Section 3.3 Mixtures of Matter (cont.) Most everyday matter occurs as mixtures—combinations of two or more substances. mixture heterogeneous mixture homogeneous mixture solution filtration distillation crystallization sublimation chromatography

5. Section 3-3 Mixtures A mixture is a combination of two or more pure substances in which each pure substance retains its individual chemical properties.mixture A homogenous mixture is a mixture where the composition is constant throughout.homogenous mixture

6. Section 3-3 Mixtures (cont.) Homogeneous mixtures are also called solutions.solutions A heterogeneous mixture is a mixture where the individual substances remain distinct.heterogeneous mixture

7. Section 3-3 Mixtures (cont.)

8. Section 3-3 Separating Mixtures Filtration is a technique that uses a porous barrier to separate a solid from a liquid in a heterogeneous mixture.Filtration Distillation is a separation technique for homogeneous mixtures that is based on the differences in boiling points of substances.Distillation Crystallization is a separation technique for homogenous mixtures that results in the formation of pure solid particles from a solution containing the dissolved substance.Crystallization

9. Section 3-3 Separating Mixtures (cont.) Sublimation is the process of a solid changing directly to a gas, which can be used to separate mixtures of solids when one sublimates and the other does not.Sublimation Chromatography is a technique that separates the components of a mixture on the basis of tendency of each to travel across the surface of another material.Chromatography