Final answer:
Physical properties can be measured without changing the composition of a substance, while chemical properties describe how a substance reacts with other substances. Reactivity with acid and flammability are examples of chemical properties.
Step-by-step explanation:
The properties of matter can be classified as either physical or chemical. Physical properties are characteristics that can be measured without changing the composition of the substance, such as mass, color, and volume. Chemical properties, on the other hand, describe how a substance reacts with other substances, such as reactivity with acid and flammability.
Reactivity with acid is a chemical property as it describes how a substance reacts with acid. For example, when a metal reacts with an acid, it produces a salt and hydrogen gas.
Flammability is also a chemical property as it describes how easily a substance can burn. For instance, substances that are highly flammable can be ignited and burn when exposed to a flame.