Grade 7 science
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Grade 7 Science. Separating Solutions. Student Activity:. 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!.

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Grade 7 Science

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Grade 7 science

Grade 7 Science

Separating Solutions


Student activity

Student Activity:

Discuss with a partner how you would separate the following mixtures…

  • Salt water

  • Muddy water

  • Nuts and bolts


Grade 7 science

  • Iron filings and sand

  • Vegetable oil and sand

  • Vegetable oil and water

  • Salt and pepper

    Be prepared to defend your answers!


Discussion question

Discussion Question

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


Separation techniques

Separation Techniques

Mechanical Sorting:

  • Used to separate the parts of a mixture based on properties such as particle size.

  • Examples: floatation & magnetism


Grade 7 science

magnetism

floatation


Filtration

Filtration:

  • A common way to separate solid particles from a mixture

  • The filters can have holes of varying sizes… small to microscopic.


Grade 7 science

Oil filter

Coffee filter

Colander

Furnace filter


Evaporation

Evaporation:

  • Change of state from a liquid to a gas.

  • Used to recover a solid solute from a solution.


Distillation

Distillation:

  • Uses two changes of state: evaporation and condensation.

  • It allows you to recover BOTH the solute and solvent from a solution.


Grade 7 science

Condensation

Evaporation


Paper chromatography

Paper Chromatography:

  • Used to separate the colored substances in a mixture such as ink.

  • Used to separate the solvents in a mixture.


Separation techniques in the home

Separation Techniques in the Home:

  • Colanders

  • Clothes dryers

  • Window screens

  • Coffee percolators

  • Salad spinners

    Any others?


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