1. Elements, Mixtures, Compound and Molecules

2. Element:
a substance that cannot be broken down into other substances by chemical or physical means.

3. C Cu Carbon Copper Chemical Symbols
All elements have their own unique symbol.
First letter is ALWAYS capitalized.
If there is a second letter, it is lowercase.
No periods are used in the chemical symbol. C
Carbon Cu
Copper 3

4. Mixture:
two or more substances that are mixed together but not chemically combined. (can be separated by physical means)

6. Compound:
a substance made of two or more elements chemically combined in a set ratio. (can only be separated by another chemical reaction)

8. The smallest particle of an element.
Atom:
The smallest particle of an element.

9. Molecule: Form when atoms are chemically joined together.
The size of the molecule depends on the number of atoms that make it up.

10. Counting Atoms:
Each element in a molecule will have a subscript (smaller number located to the bottom right of the element symbol.)
The subscript tells you the number of atoms for that element. Ex= O2 (2 atoms)
If the element has no subscript behind it then it is understood to equal 1 atom. Ex=Fe (1 atom)
To get the total number of atoms in a molecule, add the subscripts together for the entire molecule. Ex= Fe O2 (3 atoms total)

11. H=
H 2=
H2O
C6H12O6

12. 2 Types of Molecules:
Elements- molecules made of only one type of atom. (Has only one capital letter.)
Compounds- molecules that have more than one type of atom. (has more than 1 capital letter.)

13. Evidence of a Chemical Reaction:
Production of a precipitate.
Exothermic (gives off heat) or Endothermic (absorbs heat).
Production of a gas. (bubbles or vapor)
Color change.
Odor or smell.
Creates a new substance.