1. Classifying Matter

3. Matter Pure Substance (Constant Composition) Mixtures
Elements
(one type of atom)
Compounds
(combinations of atoms)
Mixtures
(Variable Composition)
Homogenous
solutions
(solution)
Heterogeneous
mixtures
(mechanical mixture)

4. Pure Substance Made up of all of the same building blocks
Contains only one kind of particle
Include compounds and elements
Ex. Compounds like water
Ex. Elements like carbon

5. Element
A pure substance that cannot be broken down into simpler substances
Ex. Gold
One single particle of gold, or any other element, is called an atom
Can be found on the periodic table.

6. Compound
Pure substance that contain two or more different elements joined in a fixed proportion
Ex. Salt
NaCl
1 sodium atom joined to 1 chlorine atom make 1 molecule of salt.

7. Mixture Made up of two or more pure substances Two types Heterogeneous
Homogeneous

8. Heterogeneous Mixture
AKA a mechanical mixture
You can see different kinds of particles
Ex. Granola, soup mix

9. Homogeneous Mixture AKA a solution Looks like one substance
Ex. Steel is an alloy of iron and carbon