physical chemistry - the branch of chemistry dealing with the physical properties of chemical substances

change - undergo a change; become different in essence; losing one's or its original nature; "She changed completely as she grew older"; "The weather changed last night"

ionise, ionize - convert into ions

physical chemistry - the branch of chemistry dealing with the physical properties of chemical substances

change state, turn - undergo a transformation or a change of position or action; "We turned from Socialism to Capitalism"; "The people turned against the President when he stole the election"

ionise, ionize - become converted into ions