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)
