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8th Grade - Molecules, Compounds, and Mixtures

This is a middle school science presentation about molecules and compounds.

Chinua Mosley

on 11 December 2013

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Transcript of 8th Grade - Molecules, Compounds, and Mixtures

The notes that you need to write are in red.
Write all of them down.
Examples will be written in purple.
You don't have to write the examples, but it will help you understand the vocabulary.
Write the examples if you need a little help understanding the concepts
Don't worry about writing anything in black.
Molecules, Compounds, and Mixtures
Mr. Mosley
Fulton Leadership Academy

A molecule is a group of two or more atoms that are held together by chemical bonds.
The air that we breathe has oxygen molecules with the chemical formula O
The "2" in this formula tells us that there are 2 oxygen atoms in this molecule
The water that we drink is a water molecule with the chemical formula H O
The "2" in this formula tells us that there are 2 hydrogen atoms in this molecule
A compound is a group of 2 or more different elements that are held together by chemical bonds
An oxygen molecule is NOT a compound because it is NOT made up of 2 different elements, it's only made of oxygen.
A water molecule IS a compound because it is made up of 2 different elements, hydrogen and oxygen.
All compounds are molecules.
Not all molecules are compounds.
A mixture is formed when substances combine in a physical way
physical ways include dissolving, melting, mixing and more
The elements in a molecule or compound can only be separated by a chemical reaction.
This video is on electrolysis. Electrolysis is the chemical separation of water into hydrogen and oxygen atoms using electricity.
Hydrogen gas is flammable and oxygen gas is flammable. What do you think will happen if you separate hydrogen gas and oxygen gas from water, collect the gasses in a bottle, and light the end of the bottle on fire?
A mixture can be separated in a physical way
physical ways include dissolving, evaporating, filtering, picking pieces out with your hand and more
Soil, soup, salt water, tap water, Kool-Aid, and a bag of skittles are examples of mixtures.
Sugar water is an example of a mixture. You can always separate the sugar from the water through crystallization and evaporation.
There are 2 types of mixtures.
Heterogeneous mixtures are mixtures that don't have their parts spread evenly
You can see the individual parts of a heterogeneous mixture without help
Granite and skittles are heterogeneous mixtures. You can see their individual parts and the parts aren't spread evenly.
Homogeneous mixtures are mixtures where the parts are spread evenly.
You need a microscope to see the different parts of a homogeneous mixture
Chocolate and blood are homogeneous mixtures. You need a microscope to see their different parts.
White Blood Cell
Red Blood Cells
The End
Full transcript