Mixtures

2 or more substances mixed together but not chemically

combined

Air is a mixture

2 types of mixtures(Homogeneous or heterogeneous)

1) Heterogeneous*not well mixed*does not appear thesame throughout.• easily separated by

physical means (filtering, magnets)

Examples: fruit salad, vegetable soup, Granite}

2) Homogeneous Mixture

• Appears the same throughout

• Is well mixed• can be separated by

physical means

• EX: milk, air, suntan lotion, paint, clouds, lemonade

Types of Homogeneous mixtures

• A) solutions

• B) colloids

• C) suspensions

A) Solutions

• When one substance dissolves in another

• 2 parts solute and a solvent*solute is the substance that is dissolved

*solvent substance that does the dissolving

Alloys

• Metal solutions

• EX:

• Sterling silver is silver with small amounts of Copper dissolved in it

• Stainless Steel is iron and chromium

B) Colloids• Colloids are solutions.

They can be described as a substance trapped inside another substance. They can be identified by their characteristic scattering of light.

• do not separate on standing

• Mixed together but not dissolved

• EX:Milk is a colloid of butter fat globules dispersed within a water based liquid

c) Suspensions

• The size of the particles is great enough so they are visible to the naked eye.

• Blood and aerosol sprays are examples of suspensions.