What are the three common temperature scales? Does the

Solution 21E: Physical process: It is a process where a substance changes its physical appearance but not its composition. It does not form any new substance. For example: evaporation of water. When water evaporates, it changes from liquid state to gaseous state. But it is still in composed of water. Chemical process: It is process where substance is chemically transformed into an another new substance. Therefore the properties will be different from each other. When hydrogen reacts with oxygen, it forms water molecule. (a) rusting of a metal can When iron reacts with