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 and solutions

Mixtures and Solutions


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


Examples

examples


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.


How could you separate the parts of these mixtures

How could you separate the parts of these mixtures?


The key is that mixtures can be separated by physical means

The key is that mixtures can be separated by PHYSICAL means


Mixtures and solutions

Like

or


You can also use these

You can also use these


Or this in the correct situation

Or this, in the correct situation


Or in the case of the concrete

Or, in the case of the Concrete


Homogenous mixture are a different story

Homogenous mixture are a different story.

Can you use simple tools to separate the stuff in milk or cola?


Here is a homogenous mixture of different metals

Here is a homogenous mixture of different metals


Mixtures and solutions

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.


Mixtures and solutions

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

This is suspension

After an hour

Just stirred

After 10 min.


This is a colloid

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.


The next class of mixture is the solution

The next class of mixture is the Solution.


Mixtures and solutions

  • 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 solution has 2 parts

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

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


Mixtures and solutions

Solvent

H2O

Solute

Sugar

Stir to create solution


Mixtures and solutions

Solutions

TEA

Coffee

Colored liquids


Common examples of solutions

Common Examples of Solutions

  • Salt water

  • Sugar water

  • Milk (a special type of solution called a “colloid”)

  • Tea

  • Coffee

  • Soda

  • Juice

  • Air

  • Pool water


Mixtures and solutions

Unlike the easy to separate heterogeneous mixtures, homogenous mixtures require more work to separate.


You can distill the solution

You can distill the solution


You can also use very fine filters such as this membrane filter

You can also use VERY fine filters such as this “membrane” filter


Mixtures and solutions

Now, you won’t be mixed up about mixtures.


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