• cutting a piece of paper
• ice melting
• boiling water
• drawing copper into a fine wire
• separating out water from salt water
• separating out oxygen gas from air

Some processes that are a physical change

• melting
• boiling
• evaporation
• condensation
• freezing
• separation of a mixture

• iron turning into rust in moist air (oxidation)
• burning paper  (combustion)
• baking soda combining with vinegar
• metal eaten away by an acid (corrosion)
• overtime, a battery loses its charge
• digesting food

Some indications that a chemical change has taken place

• a gas is produced
• the temperature changes
• a substance disappears
• a solid is formed
• a color change occurs
• a new odor is produced