How Can Mixtures Be Separated?

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How Can Mixtures Be Separated?
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• The parts of a mixture can be separated
  using their physical properties. These
  properties include size, shape, color, volume,
  density, and state.

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• One way to separate a mixture is simply to
  pick out each different type of matter. In a
  mixture of peas and carrots, you can easily pick
  out the carrots or the peas based on physical
  properties such as size, shape, and color.

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• You can also separate some mixtures by using
  a filter (FILtuhr). A filter separates things
  by size. Items smaller than the holes in the
  filter pass through it. Larger pieces are left
  behind.

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• Filters come in a variety of sizes. The
  type of filter you use depends on the size of the
  particles you want to separate. For example, a
  colander separates water from cooked pasta. The
  water passes through the holes, and the noodles
  stay behind.

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• How might you separate a mixture of salt and
  water? The salt particles dissolved in the water
  are very small. They would pass through most
  filters.

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• One way to separate this mixture is by
  evaporation (ivapuhRAYshuhn). Evaporation is
  the change of a liquid to a gas. When liquid
  water evaporates, it becomes a gas. It goes into
  the air. The salt is left behind. Another
  example of evaporation is the solids left behind
  as a ring after bathwater evaporates.

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Cause and Effect

• What happens when a glass of salt water is left
  on the kitchen counter over night?
• What is an effect of using a filter on a glass of
  salt water?
• What is the result of using a filter on a mixture
  of sand and rocks?

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What are three methods of separating mixtures?

• Answer the question
• With a partner
• In your Learning Notebook

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filter

• A filter separates things by size.
• Back to text

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evaporation

• The change of a liquid to a gas.
• Back to text