Lab Experiment: Physical and Chemical Change

Today in chemistry we did a lab experiment on physical and chemical changes.

Physical changes:
-any change not involving a change in the substance's chemical identity
-occur when objects undergo a change that does not change their chemical nature
-involves a change in physical properties (i.e texture, shape, size, color, volume, mass, weight,
and density)
-REVERSIBLE
-an example of a physical change:
                                          formation of ice.
 

Resource: www.flickr.com

Chemical changes:

- bonds are broken and new bonds are formed between different atoms.

                            　　　　　　　　　　　↑

This breaking and forming of bonds takes place when particles of the original materials collide with one another

-when chemical change occur, the atoms are rearranged and the reaction is accompanied by an energy change as new products are generated.

-IRREVERSIBLE

-an example of chemical change:

                                        burning wood.

                                                        Resource: Yahoo! Image.

Leif Tung