Properties and Changes

Properties

• Every substance demonstrates specific properties that are linked to its identity

Physical Properties

• Characteristics demonstrated by a substance on its own (no interaction with other substances)

• Melting/boiling point, electrical conductivity, density

Chemical Properties

• Characteristics that are demonstrated when a substance changes into or reacts with another substance

• Chemical properties are typically related to reactivity

• Examples: Flammability, corrosiveness, reactivity with acids

Changes

Physical change

• Involves a change in physical properties only, but the identity of the substance remains the same

• Common example: phase change such as melting and ice cube.

Chemical change

• When a substance is converted into a new substance with a new identity

• Common example: Mixing baking soda and vinegar to create carbon dioxide (CO₂)