Formula Basics

Smallest piece of matter.

Another name for atom.

Also found on the periodic table.

Example: Ne   (Neon)


Two different elements bonded together.


Example –  Na   +   Cl   =  NaCl


Two or more elements bonded together.

They can be the same element bonded together

Example:  O2


Or they may be similar to a compound

Example:  C6H12O6


The large number in front of a formula


Example:     4  H2O


This number tells you there are 4 H2O molecules.


The number after an element.  It tells you how many of that element you have.


Example:  H2


There are 2 hydrogen atoms in this formula.

Oxygen has only 1.  If there is no number you know there is only one.

Is this an element, compound or molecule?





Be is Beryllium and can be found on the periodic table.

Is this an element, compound or molecule?



Compound and Molecule


It is a compound because it is made of two different elements

Carbon and Oxygen


It’s a molecule because I have more than two atoms attached.

How many atoms are in this formula?


2 C6H12O6

Remember: the 2 means there are two molecules.

There are 12 -Carbons, 24 Hydrogens and 12 oxygens


  CH12  O6

+CH12  O6



Heterogenous Mixture
A mixture that looks like two things mixed together.
Example: Orange Juice with pulp
Homogenous Mixture
A mixture that looks like one thing. Example: Sugar Water
When a substance dissolves and forms a homogeneous mixture.
Heterogenous mixture that seperates over time.
Physical Change
When part of the substance changes, but the material it is made of stays the same. Example: Ice to Liquid water
Chemical Change
When a substance reacts and forms a new substance. (You cannot bring it back to its orignal substance)
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