Learn S'more About Reactions

Physical and Chemical Reactions

Physical Reactions

A physical change rearranges the molecule, but doesn't change the internal structure. Meaning it changes the outward appearance, but doesn't completely change the chemical layout.

Physical change when the marshmallow is just warmed.

Chemical Reactions

A chemical change is any change that results in the formation of new chemical substances. At the molecular level, chemical change involves making or breaking of bonds between atoms.

Chemical change when the marshmallow is burnt. It melts the sugars, as a cause of oxidation.

Chemical changes vs. Physical changes
Physical and Chemical Change


What are some physical and chemical changes that you can think of?