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Energiegrundlagen
Chemical reactions, such as those that occur when you light a match, involve changes in energy as well as matter. Chemical changes and their…
Erster Hauptsatz der Thermodynamik
Energy can be converted from one form into another, but all of the energy present before a change occurs always exists in some form after the…
Innere Energie
The total of all possible kinds of energy present in a substance is called the internal energy (U), sometimes symbolized as E. Suppose a system with…
Quantifizierung von Wärme
Microscopically, thermal energy is the kinetic energy associated with the random motion of atoms and molecules. Temperature is a quantitative…
Quantifizierung von Arbeit
As a system undergoes a change, its internal energy can change, and energy can be transferred from the system to the surroundings, or from the…
Enthalpie
Chemists ordinarily use a property known as enthalpy (H) to describe the thermodynamics of chemical and physical processes. Enthalpy is defined as…
Thermochemische Gleichungen
For a chemical reaction (the system) carried out at constant pressure – with the only work done caused by expansion or contraction – the…
Konstantdruck-Kalorimetrie
Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or…
Kalorimetrie bei konstantem Volumen
Calorimeters are useful to determine the heat released or absorbed by a chemical reaction. Coffee cup calorimeters are designed to operate at…
Hessscher Wärmesatz
There are two ways to determine the amount of heat involved in a chemical change: measure it experimentally, or calculate it from other…
Standardbildungsenthalpie
Enthalpy changes are typically tabulated for reactions in which both the reactants and products are at the same conditions. A standard state is a…
Reaktionsenthalpie
Hess’s law can be used to determine the enthalpy change of any reaction if the corresponding enthalpies of formation of the reactants and…
Hot Biologische Katalyse: Isotherme Titrationskalorimetrie zu Enzymreaktionen Charakterisieren
Isothermal titration calorimetry (ITC) is a well-described technique that measures the heat released or absorbed during a chemical reaction, using it…
Bestimmung der thermodynamischen Eigenschaften von Alkaline Erde-Liquid Metall-Legierungen mit der elektromotorischen Kraft-Technik
A novel electrochemical cell based on a CaF2 solid-state electrolyte has been developed to measure the electromotive force (emf) of binary alkaline…
Berechnung der atmosphärischen Konzentrationen molekularer Cluster aus <em>der ab initio</em> Thermochemie
The computational study of the formation and growth of atmospheric aerosols requires an accurate Gibbs free energy surface, which can be obtained…

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