Properties of matter are things that you can observe about matter. By describing the properties of different substances, you can distinguish them from one another.
There are two types of properties of matter:
Physical Properties: When you observe or measure the physical properties of a substance, you are observing properties that do not change the substance itself. For example, when the color of a substance changes, this does not necessarily represent a chemical change. The substance itself is of the same composition. Examples of physical properties: density, mass, volume, color, conductivity.
Chemical Properties: When you observe or measure the chemical properties of a substance, you are observing properties that change the substance itself. For example, in order to observe the chemical property of reactivity, you have to observe the substance undergoing a chemical reaction. When a substance undergoes a chemical reaction, it becomes a different substance. Examples of chemical properties: reactivity, flammability.
Flammability is the chemical property that determines whether something will burn or catch on fire. Flammability is a chemical property because in order to observe flammability, you have to observe the substance undergoing a chemical change.