Slide 1 of 21 Chemistry2.2

© Copyright Pearson Prentice Hall Slide 2 of 21 Mixtures Panning is one way to separate gold from a mixture of gold and materials such as sand or gravel. A pan containing the mixture is place underwater and shaken vigorously from left to right. You will learn how to classify and separate mixtures. 2.2

© Copyright Pearson Prentice Hall Mixtures Slide 3 of 21 > Classifying Mixtures How can mixtures be classified? 2.2

Slide 4 of 21 © Copyright Pearson Prentice Hall > Mixtures Classifying Mixtures A mixture is a physical blend of two or more components. A salad bar provides a range of items. Customers choose how much of each item to use in their salads. Each salad has a different composition. 2.2

© Copyright Pearson Prentice Hall > Slide 5 of 21 Mixtures Classifying Mixtures Based on the distribution of their components, mixtures can be classified as heterogeneous mixtures or as homogeneous mixtures. 2.2

Slide 6 of 21 © Copyright Pearson Prentice Hall > MixturesClassifying Mixtures Heterogeneous Mixtures A mixture in which the composition is not uniform throughout is a heterogeneous mixture. 2.2

Slide 7 of 21 © Copyright Pearson Prentice Hall > MixturesClassifying Mixtures Homogeneous Mixtures A mixture in which the composition is uniform throughout is a homogeneous mixture. Another name for a homogeneous mixture is a solution. 2.2

Slide 8 of 21 © Copyright Pearson Prentice Hall > Mixtures 2.2 Classifying Mixtures The term phase is used to describe any part of a sample with uniform composition and properties. A homogenous mixture consists of a single phase. A heterogeneous mixture consists of two or more phases.

Slide 9 of 21 © Copyright Pearson Prentice Hall > Mixtures 2.2 Classifying Mixtures When oil and vinegar are mixed they form layers, or phases. The oil phase floats on the water phase.

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© Copyright Pearson Prentice Hall Slide 13 of 21 Practice Problems for Conceptual Problem 2.2 Problem Solving 2.10 Solve Problem 10 with the help of an interactive guided tutorial.

© Copyright Pearson Prentice Hall Mixtures Slide 14 of 21 > 2.2 Separating Mixtures How can mixtures be separated?

© Copyright Pearson Prentice Hall > Slide 15 of 21 Mixtures Separating Mixtures Differences in physical properties can be used to separate mixtures. 2.2

Slide 16 of 21 © Copyright Pearson Prentice Hall > Mixtures Separating Mixtures Filtration The process that separates a solid from the liquid in a heterogeneous mixture is called filtration. A colander is used to separate pasta from the water in which it was cooked. This process is a type of filtration. 2.2

Slide 17 of 21 © Copyright Pearson Prentice Hall > Mixtures Separating Mixtures Distillation During a distillation, a liquid is boiled to produce a vapor that is then condensed into a liquid. 2.2

© Copyright Pearson Prentice Hall Slide 18 of 21 Section Quiz -or- Continue to: Launch: Assess students’ understanding of the concepts in Section 2.2 Section Quiz. 2.2.

© Copyright Pearson Prentice Hall Slide 19 of Section Quiz. 1.Which of the following phrases describes a mixture? a.composition varies b.composition may vary c.components cannot be separated

© Copyright Pearson Prentice Hall Slide 20 of Section Quiz. 2.Which of the following is a homogeneous mixture? a.vinegar b.iron filings in sand c.chicken noodle soup d.muddy water

© Copyright Pearson Prentice Hall Slide 21 of Section Quiz. 3.Which technique is used to separate homogeneous mixtures? a.filtration b.distillation c.magnetism d.dissolving

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