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SHHHH! This is Silent reading time! . Grade 7 Science. Separating M ixtures and Solutions. Many products depend on technology for separating mixtures and solutions. What are the three solids and the liquid in the picture below? White, yellow and brown sugar Molasses . - PowerPoint PPT PresentationTRANSCRIPT
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SHHHH! THIS IS SILENT READING TIME!
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GRADE 7 SCIENCE
Separating Mixtures and Solutions
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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
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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
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STUDENT ACTIVITY:
Discuss with a partner how you would separate the following mixtures…
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SEPARATING MIXTURES…Mixtures Method of
SeparationExplanation
Salt Water
Muddy Water
Nuts and Bolts
Iron Filings and Sand
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SEPARATING MIXTURES…Mixtures Method of
SeparationExplanation
Vegetable Oil and Sand
Vegetable Oil and Water
Salt and Pepper
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DISCUSSION QUESTION“Are the components you have separated still mixtures, or are they pure? Why or why not?”
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OPEN YOUR BOOKS TO PAGE 278
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SEPARATION TECHNIQUESMechanical Sorting:Used to separate the parts of a mixture based on properties such as particle size.
Examples: floatation & magnetism
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magnetism
floatation
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FILTRATION:A common way to separate solid particles from a mixture
The filters can have holes of varying sizes… small to microscopic.
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Coffee filter
Oil filter
Furnace filter
Colander
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EVAPORATION:Change of state from a liquid to a gas.
Used to recover a solid solute from a solution.
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DISTILLATION:Uses two changes of state: evaporation and condensation.
It allows you to recover BOTH the solute and solvent from a solution.
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Evaporation
Condensation
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Short Distillation video:
http://www.youtube.com/watch?v=xxNfJLMNS4E
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ANOTHER QUICK VIDEO: HTTP://WWW.YOUTUBE.COM/WATCH?V=UEP3AXAAQLW
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PAPER CHROMATOGRAPHY:Used to separate the colored substances in a mixture such as
ink.Used to separate the solvents in a mixture.
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NEAT CHROMATOGRAPHY ACTIVITY: HTTP://WWW.YOUTUBE.COM/WATCH?V=-FS5BTFKDXA
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SEPARATION TECHNIQUES IN THE HOME:ColandersClothes dryersWindow screensCoffee percolatorsSalad spinnersAny others?