Unit 7 Solutions and Suspensions

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Presentation transcript:

Unit 7 Solutions and Suspensions Pages 104-107, 110-111, 122-123, and 130-133

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.

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

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

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

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

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

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.

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.