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Classifying Mixtures

A mixture is a physical blend of two or more components.
Ex.: A salad bar provides a range of items.

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Looking at your QOD, explain what the difference between a pure substance and a mixture is?

Be ready to share your answer with the class

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Classifying Mixtures

Based on the distribution of their components, mixtures can be classified as heterogeneous mixtures or as homogeneous mixtures.

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Classifying Mixtures

Heterogeneous Mixtures

It’s a mixture in which the composition is not uniform throughout (you don’t see the same things in it)

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Classifying Mixtures

Homogeneous Mixtures

It’s mixture in which the composition is uniform throughout (you see the same in it).
Another name for a homogeneous mixture is a solution.

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Classifying Mixtures

Example: When oil and vinegar are mixed they form layers, or phases. The oil phase floats on the water phase.

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How can mixtures be separated?

Differences in physical properties can be used to separate mixtures.

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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.

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Separating Mixtures

Distillation

During a distillation, a mixture is boiled to produce a vapor that is then condensed into a liquid.

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