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Nozioni di base sull'energia
Nozioni di base sull'energia
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Chemical reactions, such as those that occur when you light a match, involve changes in energy as well as matter. Chemical changes and their…
Prima legge della termodinamica
Prima legge della termodinamica
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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…
Energia interna
Energia interna
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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…
Quantificazione del calore
Quantificazione del calore
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Microscopically, thermal energy is the kinetic energy associated with the random motion of atoms and molecules. Temperature is a quantitative…
Quantificazione del lavoro
Quantificazione del lavoro
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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…
Entalpia
Entalpia
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Chemists ordinarily use a property known as enthalpy (H) to describe the thermodynamics of chemical and physical processes. Enthalpy is defined as…
Equazioni termochimiche
Equazioni termochimiche
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For a chemical reaction (the system) carried out at constant pressure – with the only work done caused by expansion or contraction – the…
Calorimetria a pressione costante
Calorimetria a pressione costante
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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…
Calorimetria a volume costante
Calorimetria a volume costante
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Calorimeters are useful to determine the heat released or absorbed by a chemical reaction. Coffee cup calorimeters are designed to operate at…
Legge di Hess
Legge di Hess
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There are two ways to determine the amount of heat involved in a chemical change: measure it experimentally, or calculate it from other…
Entalpia standard di formazione
Entalpia standard di formazione
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Enthalpy changes are typically tabulated for reactions in which both the reactants and products are at the same conditions. A standard state is a…
Entalpie di reazione
Entalpie di reazione
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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 Catalisi biologica: Calorimetria isotermica di titolazione per caratterizzare reazioni enzimatiche
Isothermal titration calorimetry (ITC) is a well-described technique that measures the heat released or absorbed during a chemical reaction, using it…
Determinazione delle proprietà termodinamiche di leghe di metalli alcalino-terrosi-liquido usando la tecnica di forza elettromotrice
A novel electrochemical cell based on a CaF2 solid-state electrolyte has been developed to measure the electromotive force (emf) of binary alkaline…
Calcolo delle concentrazioni atmosferiche degli ammassi molecolari dalla termochimica <em>dell'initio ab</em>
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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