The answer to this question is the second option namely it reacts with many different substances.
Water is chemically active and reacts with some particular oxides of nonmetals to form acids and with some metals and metal oxides to form bases.
A Chemical property is defined as a property that can be used to characterize materials that change their composition or identity. It is any quality that can be determined only by altering a material's chemical identity.
Chemical properties cannot be determined by looking at a material, or by just touching it, rather the internal structure of that material must be affected to a high degree for its chemical properties to be investigated.
