If the physical properties of an unknown compound are identical to the physical properties of a compound listed in the tables, the two compounds are probably the same.
(the physical properties of an unknown compound; are; identical to the physical properties of a compound) (a compound; listed; in the tables) (the two compounds; are probably; the same)
the physical properties of an unknown compound a compound the two compounds
are listed are probably
identical to the physical properties of a compound
in the tables
the same