However, unlike physical properties, chemical properties can only be observed as the substance is in the process of being changed into a different substance.
(chemical properties; can only be observed; T:as the substance is in the process of being changed into a different substance) (the substance; is; in the process of being changed into a different substance)
chemical properties the substance
can only be observed is
T:as the substance is in the process of being changed into a different substance
in the process of being changed into a different substance