comparing physical and chemical changes

Physical Change

• Does not produce a new kind of matter

• Is generally easily reversible

• Is not accompanied by great heat change

• Does not produce an observable change in mass

Chemical Change

• Always produces a new kind of matter

• Is generally not easily reversible

• Is usually accompanied by considerable heat change

• Produces an observable change in mass

Some examples of physical changes include:

• Melting ice

• Boiling water

• Cutting paper

• Crushing a rock

• Mixing salt and water

Some examples of chemical changes include:

• Burning wood

• Cooking food

• Rusting iron

• Digesting food

• Brewing beer