Change You Can Believe in!

Chemical  Changes:


Only occur when:

1. There is a change in atmoic formation through the bonding of atoms.
2. A new substance is created
3. The change is irreversable.
4. The change is automatic ( the reaction can be initiated or act on its own).

Examples:

Burning wood and its creation of smoke, the formation of rust or the act of combining sodium and vinegar.

Physical Changes:

Only occur when:

1. There is a change in state or phase.
2. No new substance is created.

Examples:

The melting of glaciers, condensation on a glass, or the cuttting of paper.



     STATES OF MATTER - ACCORDING TO THE KINETIC MOLECULAR THEORY



      Solid:                                                          Liquid:                                              Gas:

                                                                                  

The molecules                                        The molecules are                                 The molecules are very
are held close                                          far enough apart                                   far apart and can move
together through                                     to slide past each                                  very fast and freely.
attractions from                                      and move more                                     It will conform to the
charge and can                                       freely.  It will                                        shape of its container
only vibrate.  It                                       conform to the                                      The molecules will
will not conform                                     shape of its                                            collide but there is no
to the shape of its                                   container.                                              loss of energy at all.
container.