In addition, students study chemical and physical properties of substances by examining the tarnishing of metal or burning of 
(students; study; chemical and physical properties of substances) Context(students study,List([13, 27))):(students; study chemical and physical properties of substances by examining; the tarnishing of metal or burning)
students study,List([13, 27))
students students
study study chemical and physical properties of substances by examining
chemical and physical properties of substances
the tarnishing of metal or burning