Question

the fabric changes
looking closer

1. identify complete the

table to identify each exam-
ple as a physical property or
a chemical property.

Explanation:

• Chalk: When chalk forms bubbles in vinegar, a chemical reaction (acid - carbonate reaction) occurs. So it is a chemical property.
• Ice cream: Melting is a physical change as it only changes the state (from solid to liquid) without altering the chemical composition. So it is a physical property.
• Tin: Bending is a physical change as it only changes the shape of tin without changing its chemical makeup. So it is a physical property.
• Paper: Burning is a chemical reaction (combustion) that changes the chemical composition of paper. So it is a chemical property.
• Liquid water: Evaporation is a physical change as it only changes the state (from liquid to gas) of water. So it is a physical property.
• Car door: Rusting is a chemical reaction (oxidation) that changes the chemical composition of the metal in the car door. So it is a chemical property.
• Helium balloon: Floating in air is due to the physical property of density (helium is less dense than air). So it is a physical property.

Answer:

• Chalk: chemical property
• Ice cream: physical property
• Tin: physical property
• Paper: chemical property
• Liquid water: physical property
• Car door: chemical property
• Helium balloon: physical property