1. Classes of Matter Elements, Compounds, and Mixtures
 Matter can be classified as a pure substance or a mixture.
Pure Substance: A substance in which there is only one type of particle. Elements and compounds are pure substances.
Mixture: Two or more substances mixed together but not; chemically combined (bonded); can be separated by physical means.
The components in a mixture may be in any proportion.
When mixed the original components retain/keep most/all of their original properties.

2. Classes of Matter
Matter
Mixture
Pure Substance
Elements
Compounds

3. PURE SUBSTANCE VS. MIXTURE

4. ELEMENTS A substance made of just one kind of atom.
The simplest form of matter
Cannot be further broken down or separated.
All atoms of an element have the same set of properties
Represented by a chemical symbol
Examples: Copper ( ), Hydrogen ( ), Sodium ( ), Oxygen ( )

5. COMPOUNDS
A substance made of two or more elements chemically combined (bonded).
The properties of the compound are different from the elements that make it up.
Can only be separated by chemical means (i.e. chemical reaction).
The amounts of each element in a compound are fixed. For example, in water (H2O), there are always 2 hydrogen atoms and 1 oxygen atom.

7. CaC03 (Chalk) Calcium Carbonate, Calcite
Uses in the road, papermaking, plastic, rubber, ceramics, coating, paint, spinning and weaving, the cosmetics and so on... Limestone is calcite.

8. COMPOUNDS, Continued Represented by a chemical formula
Examples: Water (H2O), Carbon Dioxide (CO2)
The number which follows an element is called the subscript; it describes the number of atoms of the preceding element. In H2O, there are 2 hydrogen atoms and 1 oxygen atom. When there is no subscript following an element, that means there is only one.

9. Matter Pure Substance Mixture Element Compound Homogeneous
Heterogeneous
Examples:
Iron
Oxygen
Hydrogen
Examples:
H2O
NaCl
CaCO3
Examples:
Unopened soft drink,
Vinegar,
salt water
Examples:
Mixed nuts
Granola

10. Mixtures can be separated into two groups
Heterogeneous
Homogeneous

11. Mixtures
The number of mixtures that can be created by combining substances is unlimited.

12. TYPES OF MIXTURES HOMOGENEOUS Well mixed
Looks the same throughout like a single substance
Solutions are homogeneous mixtures where one substance dissolves in another
Can be separated by physical means, but not as easily as a heterogeneous mixture (such as distillation).
Examples: salt water, lemonade

13. TYPES OF MIXTURES Heterogeneous Mixture: Least mixed
Does not look the same throughout
Can see the different components
Can be easily separated by picking apart or using a filter, sieve, or magnet (physical means)
Examples: Trail Mix, pizza, raisin bran

14. Mixture
Heterogeneous
Homogeneous
Examples:
Mixed nuts
Granola
Examples:
Unopened soft drink
Vinegar
Solutions
(like salt water)