Hess's Law and Conservation of EnergyA series of free High School Chemistry Video Lessons from Brightstorm.
Conservation of Energy Conservation of energy, sometimes called the first law of thermodynamics, states that energy can neither be created nor destroyed. Energy, however, can be transferred from one form to another.
Second Law of Thermodynamics The Second Law of Thermodynamics can be rephrased in several ways. Fundamentally, it says that heat always flows from hot objects to cold objects (unless work is exerted to make it flow the other direction). It can also be expressed using the concept of entropy as saying that the system's entropy will always naturally increase if no work is exerted to decrease it. These rephrasings mean fundementally the same thing because heat deals with kinetic energy and increasing a system's kinetic energy will increase the system's entropy.
Entropy Entropy measures the amount of disorder in a system. Nature tends towards disorder, so as time elapses, entropy naturally increases. Energy is required in order to decrease entropy.
Hess’s Law Hess's Law states that the energy of a chemical reaction is the same regardless of the number of steps needed or the reaction mechanism. Hess's law is directly related to the law of conservation of energy.
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