Mixtures

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Mixtures

Unit III Properties of Matter

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BELLWORK

What is a mixture?

How can it be separated?

Can you provide another example?.

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BELLWORK

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Mixtures

A mixture is a physical blend of two or more substances.

Their composition varies (Air).

There are two types of mixtures: homogenous and heterogenous

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Mixtures

Heterogenous mixtures

Is the type of mixture that is not uniform in composition.

If you were to sample one portion of such a mixture, it’s composition would be different from that of another portion.

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Mixtures

Homogenous mixture

Is the type of mixture that has a completely uniform composition throughout itself.

It’s components are evenly distributed throughout the sample.

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Homogenous or Heterogenous?

Air

Salt water

Tea

Brass

Vinegar

Hydrogen peroxide

Steel

Salad dressing

Apple

Sand

Paint

Granite

Laundry detergent

Cereal

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Solutions

Is the special name that scientists give to homogenous mixtures.

Solutions may be gases, liquids or solids.

An example: solution of sugar in water.

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Solutions

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Phases

Any part of a system with uniform composition and properties is called a phase.

On a homogenous mixture you have “one phase” only.

On a heterogenous mixture you have “two or more phases”.

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Phases in a heterogenous mixture

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Phases in a homogenous mixture

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Separating Mixtures