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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 Presentation
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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?