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.