Waiting
Login processing...

Trial ends in Request Full Access Tell Your Colleague About Jove
Глава 6
Основы энергетики
Chemical reactions, such as those that occur when you light a match, involve changes in energy as well as matter. Chemical changes and their…
Первый закон термодинамики
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…
Внутренняя энергия
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…
Количественная оценка тепла
Microscopically, thermal energy is the kinetic energy associated with the random motion of atoms and molecules. Temperature is a quantitative…
Количественная оценка работы
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…
Энтальпия
Chemists ordinarily use a property known as enthalpy (H) to describe the thermodynamics of chemical and physical processes. Enthalpy is defined as…
Термохимические уравнения
For a chemical reaction (the system) carried out at constant pressure – with the only work done caused by expansion or contraction – the…
Калориметрия постоянного давления
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…
Калориметрия постоянного объема
Calorimeters are useful to determine the heat released or absorbed by a chemical reaction. Coffee cup calorimeters are designed to operate at…
Закон Гесса
There are two ways to determine the amount of heat involved in a chemical change: measure it experimentally, or calculate it from other…
Стандартная энтальпия образования
Enthalpy changes are typically tabulated for reactions in which both the reactants and products are at the same conditions. A standard state is a…
Энтальпии реакции
Hess’s law can be used to determine the enthalpy change of any reaction if the corresponding enthalpies of formation of the reactants and…
Горячая биологического катализа: изотермический титрования калориметрия для характеристики ферментативных реакций
Isothermal titration calorimetry (ITC) is a well-described technique that measures the heat released or absorbed during a chemical reaction, using it…
Вычисление атмосферных концентраций молекулярных кластеров из <em>термохимии ab initio</em>
The computational study of the formation and growth of atmospheric aerosols requires an accurate Gibbs free energy surface, which can be obtained…

Get cutting-edge science videos from JoVE sent straight to your inbox every month.

Waiting X
Simple Hit Counter