1. Classifying

2. States of Matter

3. Solid Definite shape and volume Particles tightly packed together
Expands when heated
Incompressible
(not compressible)

4. Liquid Fluid in shape Takes the shape of the bottom of a container
Incompressible
(not compressible)
Expands when heated

6. Gas Particles can move freely in all directions
Diffuse to fill container
Take the shape of the container
Particles are far apart
Easily compressed

7. Gas is mostly empty space.
Water Vapor

8. Gas vs Vapor
Gas
Vapor
Substance in the gaseous state at room temperature
Example: Oxygen
Gaseous state of a substance that is solid or liquid at room temperature
Example: water vapor

10. Classification of
Matter

11. Substance
Matter that has a constant composition and distinct properties

12. Element Substance that cannot be separated into simpler substances
Most occur naturally on Earth (118 to date)
Ex: Gold, Carbon, Hydrogen

13. Atomic number
Chemical symbol
Atomic mass
Chemical Name
**The first letter in ALL chemical symbols is ALWAYS capitalized, the second letter is ALWAYS lowercase
Ex. Ca for Calcium and Fe for Iron

14. Compound Two or more elements chemically combined
Has properties different than its components
Can be separated only by chemical means (electricity & heat)
Subscripts denote number of atoms
Mg3N2
__Mg, __N
Mg3(PO4)2
__Mg, __P,__O
Numbers outside of the parentheses get multiplied in 3 2 3 2 8