Section 5.1 Pure Substances and MIxtures

Give 3 examples of pure substances

1. Gold 2. Water 3. White sugar

What is a heterogeneous mixture?

A heterogeneous mixture is made up of different parts with different properties. You can see the parts just by looking at it. Sometimes you need a microscope to see the different parts. - You need a microscope to see that milk is a heterogeneous mixture. - sports drink crystals - pizza

What is a mixture?

A mixture contains 2 or more different types of matter. A mixture can be heterogeneous or homogeneous.

What is a pure substance?

A pure substance is the same throughout. Every sample always has the same properties. Pure substances are homogeneous.

How do you determine whether or not a sample of matter is a pure substance or a mixture?

Heterogeneous materials are always mixtures.

What is the definition of homogeneous?

Homogeneous means that every part is the same as every other part.

What is a homogeneous mixture?

Homogeneous mixtures contain two or more pure substances. The substances are mixed so their properties are blended and every part of the mixture is the same. Example: - a sugar- water mixture - window cleaner - orange juice

How can you tell that a sample of matter is a mixture?a

Look at the ingredient list; if it has more than one ingredient, it's a mixture. If it doesn't have an ingredients list, look at it to see if it's made up of different parts. (Example: beach sand is made up of sand, shells and maybe even seaweed)