Separating Mixtures

Separating Mixtures Ms.Frajman Dirty water

Oil and Water

Saltwater

Settling Density causes parts

of the mixture to settle to the bottom. This process is used

during water filtration. Contaminants sink and clearer water is skimmed off.

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Filtration A mixture is passed

through material with many holes. Anything larger than the hole is trapped while the rest of the mixture passes through. Examples: Dirty

water lab Precipitation lab 3

Crystallization The separation

process in which the solvent is evaporated, leaving crystals of solute behind. Examples:  Rock candy  Saltwater lab

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Chromatography This process is mostly

used to identify substances. As the substance is drawn up the material (e.g., filter paper), it carries the solutes with it. The least dense are drawn farthest up the filter paper. 5

 Example:  Chromatography

lab- green

Distillation The separation process in which the desired component is evaporated from the solution and collected. Water is boiled and the steam is collected. As the steam cools, it condenses to form pure water and anything that was dissolved in the water is left behind When could we have used this method?

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Distillation

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Video:

http://activities.macmillanmh.com/science/ca/sc C:\Users\Mekaila Frajma

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Purifying water Step #1: Alum surrounds dirt particles in the

Settli ng

same way soap surrounds dirt. This causes the dirt particles to get heavy and sink to the bottom

Step #2: The clearer water is skimmed off

the top

Filtrati on

Step #3: Filters remove any remaining solid

particles

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Step #4: Chemicals are added to kill any