Mixtures and solutions
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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
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



Mixtures1
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
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.




Like methods

or





Homogenous mixture are a different story
Homogenous mixture are a different story. methods

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 Forms mixed in together are easy to see and separate, The First is Made of Small, but not Tiny particles mixed in a liquid or gas. It is called a SUSPENSION


This is suspension
This is suspension mixed in together are easy to see and separate,

After an hour

Just stirred

After 10 min.


This is a colloid
This is a Colloid mixed in together are easy to see and separate,

  • 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.


The next class of mixture is the solution
The next class of mixture is the Solution. mixed in together are easy to see and separate,


  • A solution is a mixed in together are easy to see and separate, 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 solution has mixed in together are easy to see and separate, 2 parts

  • A Solvent – usually a liquid (but not always)

  • A Solute which can be liquid or solid, but mostly solid.


Solvent mixed in together are easy to see and separate,

H2O

Solute

Sugar

Stir to create solution


Solutions mixed in together are easy to see and separate,

TEA

Coffee

Colored liquids


Common examples of solutions
Common Examples of Solutions mixed in together are easy to see and separate,

  • 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 distill the solution
You can distill the solution homogenous mixtures require more work to separate.




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