G RADE

1. GRADE 7 SCIENCE Separating Solutions

2. STUDENT ACTIVITY: Discuss with a partner how you would separate the following mixtures… Salt water    Muddy water Nuts and bolts

3. Iron filings and sand Vegetable Vegetable oil oil and and sand water Salt and pepper Be prepared to defend your answers!

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

5. SEPARATION TECHNIQUES MechanicalSorting: Used to separate the parts of a mixturebased on properties such as particle size. Examples: floatation magnetism &

6. magnetism floatation

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

8. Oil filter Coffee filter Colander Furnace filter

9. EVAPORATION: Change liquidto of state from a a gas. Used solute to recover a solid from a solution.

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

12. Condensation Evaporation

13. PAPERCHROMATOGRAPHY: Used to separate the colored substances in a mixture such as ink. Used to separate the solvents in a mixture.

15. SEPARATION TECHNIQUES HOME: IN THE Colanders Clothes Window dryers screens Coffee Salad percolators spinners Any others?