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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!
DISCUSSION QUESTION
“Are the components you
have separated still
mixtures, or are they
pure? Why or why not?”
SEPARATION TECHNIQUES
Mechanical Sorting:
Used to separate the
parts of a mixture based
on properties such as
particle size.
Examples: floatation &
magnetism
magnetism
floatation
FILTRATION:
A
common way to
separate solid particles
from a mixture
The filters can have
holes of varying sizes…
small to microscopic.
Coffee filter
Oil filter
Colander
Furnace filter
EVAPORATION:
of state from a
liquid to a gas.
Used to recover a solid
solute from a solution.
Change
DISTILLATION:
Uses
two changes of
state: evaporation and
condensation.
It allows you to recover
BOTH the solute and
solvent from a solution.
Condensation
Evaporation
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:
Colanders
Clothes
dryers
Window screens
Coffee percolators
Salad spinners
Any others?