Ways to SeparateWays to Separate Mixtures Mixtures

Which Method?Which Method?

• There are several ways to separate mixtures.

• The physical properties of the mixture will determine which separation method is the best one to use.

SiftingSifting• Sifting involves using a sieve or a sifter

as a way to separate solids of varying sizes.

• Examples include: rocks, gravel, and sand.

• Think of another example of a mixture that can be separated by sifting.

Magnetic AttractionMagnetic Attraction

• Magnets are used to separate magnetic materials such as iron, steel, nickel or cobalt from non-magnetic materials in a mixture.

• Examples include: separating iron filings from sand.

• Think of another example of a mixture that can be separated by using a magnet.

FiltrationFiltration

• Filtration removes solids from liquids by using a filter.

• Example: a mixture of sand and water

• Think of another example of a mixture that can be separated by using a filter.

EvaporationEvaporation• Evaporation involves heating a solution

until the liquids turn to gases and leave the solids behind.

• Example: boiling a solution of water and salt until all that is left are the salt crystals.

Which Method?Which Method?

• You have been given a mixture of sand, salt, and water. Which method or methods will you use to separate this mixture? Why?

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