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The relationship between Entropy, Enthalpy and Free Energy

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The relationship between Entropy, Enthalpy and Free Energy

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Gibbs free energy combines enthalpy and entropy into a single value. Gibbs free energy is the energy associated with a chemical reaction that can do useful work.

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The best example is the mixture in between oxygen and nitrogen in our atmosphere to produce Nitrogen Monoxide

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The best example is when we start a fire. Fire releases heat and the surroundings are hotter.

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The best indicator of spontaneity in a reaction is the change in Entropy. The Second Law of Thermodynamics states that for a reaction to be spontaneous, there must be an increase in entropy.

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Spontaneous and Non Spontaneous reactions

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Spontaneous and Non Spontaneous reactions

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A spontaneous process is capable of proceeding in a given direction without needing to be driven by an outside source of energy.

A non spontaneous reaction, is a chemical reaction in which the standard change in free energy is positive, and energy is absorbed.

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The third law of thermodynamics states that the entropy of a system approaches a constant value as the temperature approaches absolute zero.

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The Gibbs free energy of a system at any moment in time is defined as the enthalpy of the system minus the product of the temperature times the entropy of the system

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Enthalpy is an energy-like property or state function

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Entropy, the measure of a system's thermal energy per unit temperature that is unavailable for doing useful work.

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The system consists of those molecules which are reacting. The surroundings are everything else; the rest of the universe.

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A reversible process is one in which both the system and its environment can return to exactly the states they were in by following the reverse path. An irreversible process is one in which the system and its environment cannot return together to exactly the states that they were in.

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A state function is a property describes a particular state, without depending on the path taken to reach this state.

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Work is the energy required to move an object against a force.

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The best example for the Second Law of Thermodynamics is when an ice cube is melting because without the right temperature, the ice cube is not in an equilibrium state

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The best example for the Third Law of Thermodynamics is your Ex heart. She will show her true self (approach a constant value) when she is breaking up with you (an absolute zero freezing cold heart)

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The best real life example is when solar energy is absorbed by plants to start the process of photosynthesis

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The first law of thermodynamics, also known as Law of Conservation of Energy, states that energy can neither be created nor destroyed; energy can only be transferred or changed from one form to another.

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Thermodynamics tells chemists whether a particular reaction is energetically possible in the direction in which it is written, and it gives the composition of the reaction system at equilibrium.

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The second law of thermodynamics says that the entropy of any isolated system always increases. Isolated systems spontaneously evolve towards thermal equilibrium—the state of maximum entropy of the system.