1. Classifying Matter: Atoms, Elements, & Molecules

2. Elements Atoms Molecules
Pure Substances
pure substance - A sample of matter that has definite chemical and physical properties.
Made up of 1 type of particle
Elements
Atoms
Molecules

3. Atoms atom – a small particle that makes up matter
smallest particle an element can be divided and still be considered the same substance

4. Hydrogen Atom
Oxygen Atom

5. Elements
element - pure substance that cannot be separated into simpler substance by physical or chemical means
made up of 1 type of atom
each element can be identified by it’s properties
properties do not change regardless of the sample size
examples: boiling point, melting point and density (physical properties) and reactivity with an acid (chemical property).

6. Hydrogen Element
Hydrogen Atom
Oxygen Atom
Oxygen Element

7. Molecules
molecule - a group of atoms that are held together by chemical forces
consist of a single element or different elements
smallest unit of matter that can exist by itself and retain all of a substance's chemical properties

8. Hydrogen Element
Hydrogen Atom
Water Molecule
Oxygen Atom
Oxygen Element