SHHHH! THIS IS SILENT READING TIME!

GRADE 7 SCIENCE

Separating Mixtures and Solutions

What are the three solids and the liquid in the picture below?

White, yellow and brown sugar

Molasses

MANY PRODUCTS DEPEND ON TECHNOLOGY FOR SEPARATING MIXTURES AND SOLUTIONS

WHAT YOU WILL LEARN:In this chapter, you will identify separation techniques that are

used in and around the home describe how to use different methods

to separate a variety of mixtures identify examples of how science related

to mixtures and solutions affects our lives

STUDENT ACTIVITY:

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

SEPARATING MIXTURES…Mixtures Method of

SeparationExplanation

Salt Water

Muddy Water

Nuts and Bolts

Iron Filings and Sand

SEPARATING MIXTURES…Mixtures Method of

SeparationExplanation

Vegetable Oil and Sand

Vegetable Oil and Water

Salt and Pepper

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

OPEN YOUR BOOKS TO PAGE 278

SEPARATION TECHNIQUESMechanical 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

Furnace filter

Colander

EVAPORATION:Change of state from a liquid to a gas.

Used to recover a solid solute from a solution.

DISTILLATION:Uses two changes of state: evaporation and condensation.

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

Evaporation

Condensation

Short Distillation video:

http://www.youtube.com/watch?v=xxNfJLMNS4E

ANOTHER QUICK VIDEO: HTTP://WWW.YOUTUBE.COM/WATCH?V=UEP3AXAAQLW

PAPER CHROMATOGRAPHY:Used to separate the colored substances in a mixture such as

ink.Used to separate the solvents in a mixture.

NEAT CHROMATOGRAPHY ACTIVITY: HTTP://WWW.YOUTUBE.COM/WATCH?V=-FS5BTFKDXA

SEPARATION TECHNIQUES IN THE HOME:ColandersClothes dryersWindow screensCoffee percolatorsSalad spinnersAny others?