Separating Mixtures - Weebly · or substances are mixed together but do not chemically combine. ......
Transcript of Separating Mixtures - Weebly · or substances are mixed together but do not chemically combine. ......
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Separating
Mixtures
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What is a mixture?
When two or more materials
or substances are mixed
together but do not chemically
combine.
This means they retain their
original properties.
This means they can be
separated by physical means.
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What are the different ways of separating
mixtures?
Magnetism
Hand separation
Filtration
Sifting or sieving
Extraction and evaporation
Chromatography
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Magnetism If one component of the mixture has magnetic
properties, you could use a magnet to separate the
mixture. Iron, nickel, and cobalt are all materials that
are magnetic.
Not all metals are magnetic: gold, silver, and
aluminum are examples of metals that are not
magnetic.
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Example of magnetism
Magnetic pulley removing metal pieces from
wood pile.
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Hand separation Separating the parts of a mixture by hand.
Only useful when the particles are large
enough to be seen clearly.
Useful for: organizing, categorizing, grouping,
recognizing patterns or trends
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Example of hand separation:
Using your fork to separate tomatoes, lettuce,
cucumber, onions, etc. in your salad.
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Filtration Used when separating a solid substance from a fluid (a
liquid or a gas) by passing a mixture through a porous
material such as a type of filter.
Works by letting the fluid pass through but not the solid.
Examples of filters: coffee filter, cloth, oil filter, even sand
(earth’s natural filter)
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Example of filtration:
Using a coffee filter to separate the coffee
flavor from the coffee beans.
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Sifting or sieving Used to separate a dry mixture which contains
substances of different sizes by passing it
through a sieve, a device containing tiny holes.
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Example of sifting/sieving:
Using a sieve to
separate sand
from pebbles.
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Evaporation Used to separate the components of a homogeneous
mixture/solution. Solutions have a solute—the part that gets
dissolved and a solvent—that part that does the dissolving. If
the solution is heated, the solvent evaporates leaving the
solute behind.
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Example of evaporation:
Using water to dissolve sugar, then letting the water
evaporate, leaving the sugar behind.
*What would
be the solute
and solvent
in this
scenario?
Solute =
Solvent =
Solution =
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Chromatography
Used to separate dissolved substances in a solution
from each other.
Mixture Components
Separation
Stationary Phase
Mobile Phase
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Example of chromatography:
Using chromatography paper to separate ink into it’s
original components. Helpful in crime scene
investigations, drug analysis, and almost every aspect
of science.