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Mixtures and Solutions. Mixtures. two or more substances that are not chemically united and that exist in no fixed proportion to each other. Salad, Tea, Milk, Soda, Spaghetti, Sand, Stew, Concrete, Raison Bran and most Rocks. examples. Mixtures. Heterogeneous. Homogenous.
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Mixtures two or more substances that are not chemically united and that exist in no fixed proportion to each other Salad, Tea, Milk, Soda, Spaghetti, Sand, Stew, Concrete, Raison Bran and most Rocks
Mixtures Heterogeneous Homogenous Salad, gravel, sand, spaghetti Suspension Solutions Colloid • .1 – 2 nm • Transparent • Won’t separate • Ex. Salt water. • Properties can change • 2 – 1000 nm • Murky or opaque • Ex. Fog, Milk • Hard to filter • 1000nm - .000001 m • Murky or opaque • Blood, aerosol • Can filter easily, will settle out.
Heterogeneous Mixtures are easily separated by physical methods For example, if you spill paper clips in your cereal, you made a mixture. You can remover the clips with a magnet.
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Homogenous mixture are a different story. Can you use simple tools to separate the stuff in milk or cola?
Unlike a heterogeneous mixture where the parts that were mixed in together are easy to see and separate, Homogenous Mixtures are uniformly mixed and it is very hard to see the individual parts.
Heterogeneous Mixtures Come in Three Main FormsThe First is Made of Small, but not Tiny particles mixed in a liquid or gas. It is called a SUSPENSION
This is suspension After an hour Just stirred After 10 min.
This is a Colloid • The particles in a colloid are much smaller than in a suspension, They don’t settle and the block most of the light going through the mixture making it murky or even opaque.
A solution is a mixture of two or more substances. Usually liquids, but not always. • It is “homogenous” meaning the same throughout. • It is hard to separate because the particles are so small. • In this one, you can see that it is the same throughout.
A solution has 2 parts • A Solvent – usually a liquid (but not always) • A Solute which can be liquid or solid, but mostly solid.
Solvent H2O Solute Sugar Stir to create solution
Solutions TEA Coffee Colored liquids
Common Examples of Solutions • Salt water • Sugar water • Milk (a special type of solution called a “colloid”) • Tea • Coffee • Soda • Juice • Air • Pool water
Unlike the easy to separate heterogeneous mixtures, homogenous mixtures require more work to separate.
You can also use VERY fine filters such as this “membrane” filter