Questions: Classify each of the changes as a physical change or a chemical change. - heating hair - Evaporation of mercury (Hg) - carving plastic - condensation of water vapors - turning paper - slicing an apple - tearing aluminum foil

Solution Steps

A physical change involves a change in the physical properties of a substance without altering its chemical composition. Examples include changes in state, shape, or size. A chemical change, on the other hand, results in the formation of one or more new substances with different chemical properties.

• Bleaching hair: This is a chemical change because it involves a chemical reaction that alters the color of the hair by breaking down the melanin pigment.
• Evaporation of mercury (Hg): This is a physical change because it involves a change of state from liquid to gas without altering the chemical composition of mercury.
• Carving plastic: This is a physical change because it involves changing the shape of the plastic without altering its chemical structure.
• Condensation of water vapors: This is a physical change because it involves a change of state from gas to liquid without altering the chemical composition of water.
• Turning paper: This is a physical change because it involves changing the orientation or position of the paper without altering its chemical structure.
• Slicing an apple: This is a physical change because it involves changing the shape of the apple without altering its chemical composition.
• Tearing aluminum foil: This is a physical change because it involves changing the shape of the foil without altering its chemical composition.

Final Answer