For inorganic compounds Chemical properties remain same but colour or physical appearance changes. CuSO4 .5H2O is blue and crystalline but CuSO4 anhydrous is colourless.Colour change can be explained by theories of Co ordination compounds. In organic compounds ; chemical properties also change as dehydration changes the chemical nature; C2H5OH---> C2H4+H2O Solution For inorganic compounds Chemical properties remain same but colour or physical appearance changes. CuSO4 .5H2O is blue and crystalline but CuSO4 anhydrous is colourless.Colour change can be explained by theories of Co ordination compounds. In organic compounds ; chemical properties also change as dehydration changes the chemical nature; C2H5OH---> C2H4+H2O.