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Atoms, Molecules, Compounds, and Mixtures

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

Robert White

on 14 October 2014

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Transcript of Atoms, 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.
Classification of Matter
A pure substance containing one kind of atom.
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
Neon and Chlorine are examples of elements we use every day.
A compound is a pure substance made of 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.
Compounds cannot be separated physically.
A mixture is two or more elements or compounds NOT chemically combined
An element cannot be separated into smaller materials.
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
Atoms Review
Proton (+)
Neutron (0)
Electron (-)
Everything is made of atoms

Atoms are made of three types of particles
Determining protons, neutrons and electrons
Protons = atomic number

Electrons = atomic number

Neutrons = mass(rounded) - atomic number

Beryllium has 4 protons, 4 electrons, and 5 neutrons
Homogenous Mixtures (solutions) are uniform or the same throughout. Ex: Salt Water

Heterogeneous Mixtures are non-uniform or are different in different areas. Ex: Potato Salad
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