Physical & Chemical Changes

Physical Change

• Atoms do not rearrange (switch partners)

• Only physical properties change. Chemical properties do not change

• Physical changes are generally easy to reverse

• No energy is produced by the substance.

Chemical Change

• Atoms are rearranged into different molecules. There will be a new chemical formula

• Both physical and chemical properties are changed

• Changes are not reversible without another reaction

• Energy is often produced ( fire or heat, for example)

Fizzing/Foaming & Sound

Color Change

Heat or Light

Odor

Physical vs. Chemical

Physical change is like printing the same word in a different style of type:

stampedes stampedes

Chemical change, or chemical reaction, is like scrambling the letters of a word to make new words:

stampedes made + steps

Open book to pg. 599