Chemistry: CHEMICAL LAWS
Chemical laws are laws of nature that are relevant to chemistry. All the processes that are occurring naturally in nature but have concern with chemistry are included under chemical laws. The most famous and used law in chemistry is the law of conservation of mass. According to the definition of law of conservation of mass, it states that mass can neither be created not it can be destroyed but it can be changed from one form of energy to another for of energy. The total energy of the universe remains conserved. For example, a stone that is lying at the top of the cliff has potential energy. When you throw it down its potential energy, (energy due to its position) is changed in to kinetic energy (energy due to motion of the body).
When the stone strikes to the ground its energy again changes into potential energy and some of the energy is lost as sound and heat energy as when the stones hits the ground it produces sound and becomes a little hot.
If you take out the sum of the energy stored in the stone when it was on the cliff and the total sum of energy when it fall from the cliff, sound energy produced heat energy and the potential energy still restored in it. You will see the energy n the cliff and on the ground is the same.
Conservation of energy is the most important concept in chemistry that also forms the basis in thermodynamics, equilibrium and their useful concepts.