Simplify the following text for a Grade 11 native English-speaking person.
Original: A chemical property is any of a material 's properties that becomes evident during a chemical reaction ; that is , any quality that can be established only by changing a substance 's chemical identity .
Simplified: This is different than the physical property of the substance because this property is only shown when the substance is reacting or changing its chemistry ; because of this it is difficult to see a chemical property . Chemical properties are determined with an experiment or a highly developed model .