1. Unit 7 Solutions and Suspensions
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2. Solutions
A solution is a mixture of items in which the particles are evenly mixed
Ex: salt and water
Mostly common are liquid solutions.
Air is a gas solution.

3. Other solutions Tap water is a solution contains: Iron Calcium
Liquid chlorine
Nitrogen gas
Oxygen gas

4. Parts of a solution Salt dissolves in water.
Salt is called the solute.
Water is called the solvent.

5. Soluble verses Insoluble
Soluble substances
Solute disappears or mixes evenly
Ex: salt and water
Insoluble substances
Solute stays visible
Ex: oil and water

6. Changing the rate items dissolve
Ways to speed up dissolving:
Stirring
Heating
Breaking into smaller pieces
Adding pressure

7. Forming crystals
Crystals will form when there is a LOT of solute in the solution.
Fancy word: supersaturated
Crystals can be made in labs for use in:
Lasers and fiber optics
Computers and credit cards
Lab made gems

8. Suspensions
A suspension is a mixture of materials that separate when left alone after time
Ex: Soil and water, vinegar and oil salad dressing, smog (smoke and fog)
The heavier, bigger items fall to the bottom
The particles are usually large and can be seen, unlike in a solution.

9. Properties of suspensions
In a suspension, the particles scatter light
Ex: Shining a flashlight through water with dirt in it. You can see the beam of light travelling through.
You cannot see the beam of light in a solution.