Formula Basics

Atom
Smallest piece of matter.
Element

Another name for atom.

Also found on the periodic table.

Example: Ne   (Neon)

Compound

Two different elements bonded together.

 

Example –  Na   +   Cl   =  NaCl

Molecule

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

Coefficent

The large number in front of a formula

 

Example:     4  H2O

 

This number tells you there are 4 H2O molecules.

Subscript

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

Element.

 

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

Is this an element, compound or molecule?

 

CO2

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

__________

C12H24O12

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
Solution
When a substance dissolves and forms a homogeneous mixture.
Suspension
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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