Does anyone know methods that scientists use to determine if a change was physical or chemical?

If there is no change in the chemical properties, it is a physical change. 
Methods they use to determine physical changes: 
-State in Matter change 
-Difference of Size 
If there is a change in the chemical composition, it is a chemical change. 
Methods they use to determine chemical changes: 
-Bubbling 
-Color change 
-Solid formation from mixing 
-Heat given off 
-New substance with different properties.