G RADE 7 S CIENCE Separating Solutions. S TUDENT A CTIVITY : Discuss with a partner how you would separate the following mixtures… Salt water Muddy water.

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Presentation transcript:

G RADE 7 S CIENCE Separating Solutions

S TUDENT A CTIVITY : Discuss with a partner how you would separate the following mixtures… Salt water Muddy water Nuts and bolts Iron filings and sand Vegetable oil and sand Vegetable oil and water Salt and pepper Be prepared to defend your answers!

D ISCUSSION Q UESTION “Are the components you have separated still mixtures, or are they pure? Why or why not?”

S EPARATION T ECHNIQUES Mechanical Sorting: Used to separate the parts of a mixture based on properties such as particle size. Examples: floatation & magnetism

F ILTRATION : A common way to separate solid particles from a mixture The filters can have holes of varying sizes… small to microscopic.

E VAPORATION : Change of state from a liquid to a gas. Used to recover a solid solute from a solution.

D ISTILLATION : Uses two changes of state: evaporation and condensation. It allows you to recover BOTH the solute and solvent from a solution.

Evaporation Condensation

P APER C HROMATOGRAPHY : Used to separate the colored substances in a mixture such as ink. Used to separate the solvents in a mixture.

S EPARATION T ECHNIQUES IN THE H OME : Colanders Clothes dryers Window screens Coffee percolators Salad spinners Any othe rs?