Jim drops an iron magnet during a chemistry lab experiment. he finds that it is no longer magnetic. what has happened in terms of its properties? a. a physical change occurred in which the iron remained iron, but lost one of its physical properties. b. a physical change occurred that changed the iron in the magnet into nickel. c. a chemical change occurred that changed the iron in the magnet into nickel. d. a chemical change occurred in which the iron remained iron, but lost one of its chemical properties.