Final answer:
Reactivity is the ability of matter to combine chemically with other substances.
Step-by-step explanation:
The ability of matter to combine chemically with other substances is known as reactivity. Chemical properties are the characteristics that describe how a substance can undergo a chemical change, and reactivity is one of those properties. Reactivity can be observed in various chemical reactions, such as the combustion of a flammable substance or the oxidation of a metal to form rust.
Learn more about Reactivity