if two substances together form a mixture then those substances can be separated from one another by physical changes
separating_mixture is physical_creation_event. separating_mixture is not physical_creation_event. separating_mixture is physical_destruction_event. separating_mixture is not physical_transformation. separating_mixture is not physical_destruction_event. separating_mixture is complete_separation. separating_mixture is physical_transformation. mixture is substance. chemistry is substance. separating is physical_event.