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In order to avoid confusion, scientists discuss thermodynamic values in reference to a system and its surroundings. Everything that is not a part of the system constitutes its surroundings. The system and surroundings are separated by a boundary. For example, if the system is one mole of a gas in a container, then the boundary is simply the inner wall of the container itself.

Everything outside of the boundary is considered the surroundings, which would include the container itself. The boundary must be clearly defined, so one can clearly say whether a given part of the world is in the system or in the surroundings. If matter is not able to pass across the boundary, then the system is said to be closed ; otherwise, it is open. A closed system may still exchange energy with the surroundings unless the system is an isolated one, in which case neither matter nor energy can pass across the boundary.

A Thermodynamic System : A diagram of a thermodynamic system.


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. For example, turning on a light would seem to produce energy; however, it is electrical energy that is converted. This law says that there are two kinds of processes, heat and work, that can lead to a change in the internal energy of a system. Since both heat and work can be measured and quantified, this is the same as saying that any change in the energy of a system must result in a corresponding change in the energy of the surroundings outside the system.

In other words, energy cannot be created or destroyed.

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If heat flows into a system or the surroundings do work on it, the internal energy increases and the sign of q and w are positive. 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. More simply put: the entropy of the universe the ultimate isolated system only increases and never decreases.

Fundamental concepts

A simple way to think of the second law of thermodynamics is that a room, if not cleaned and tidied, will invariably become more messy and disorderly with time — regardless of how careful one is to keep it clean. Will Ice Spontaneously Melt? The entropy change for the process. Solution We can assess the spontaneity of the process by calculating the entropy change of the universe.

Check Your Learning Using this information, determine if liquid water will spontaneously freeze at the same temperatures.

Chemistry (CHEM)

What can you say about the values of S univ? Entropy is a state function, and freezing is the opposite of melting. The previous section described the various contributions of matter and energy dispersal that contribute to the entropy of a system. With these contributions in mind, consider the entropy of a pure, perfectly crystalline solid possessing no kinetic energy that is, at a temperature of absolute zero, 0 K.

According to the Boltzmann equation, the entropy of this system is zero.

1st Law of Thermodynamics. Thermodynamics & chemistry(part 18) by Arvind Arora. Made EJee.

Standard entropies are given the label for values determined for one mole of substance at a pressure of 1 bar and a temperature of K. Table 2 lists some standard entropies at You can find additional standard entropies in Appendix G. Solution The value of the standard entropy change at room temperature, , is the difference between the standard entropy of the product, H 2 O l , and the standard entropy of the reactant, H 2 O g.

The value for is negative, as expected for this phase transition condensation , which the previous section discussed. Check Your Learning Calculate the standard entropy change for the following process:. Solution The value of the standard entropy change is equal to the difference between the standard entropies of the products and the entropies of the reactants scaled by their stoichiometric coefficients.

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Check Your Learning Calculate the standard entropy change for the following reaction:. The third law of thermodynamics establishes the zero for entropy as that of a perfect, pure crystalline solid at 0 K.

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    The Laws of Thermodynamics | Boundless Chemistry

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