Internal energy content

Endothermic reactions may not have obvious chemical reactivity hazards, but should nevertheless be expected to be associated with chemical reactivity hazards. Endothermic means a reaction that absorbs heat i.e., heat must be added for the reaction to continue. Since energy is being put into the endothermic reaction system, the final products will have a greater internal energy content than the starting materials, so the products themselves may pose a chemical reactivity hazard. In addition, the endothermic... 

The assembly of molecular ions formed in a mass spectrometry experiment typically contains ions with different amounts of internal energy. A distribution function P( ) can be defined, provided internal energy is randomised and reaction is slow compared with the ionization and randomisation processes. P( ) must be appropriately normalised. It will be assumed here that /fmax P(E)dE is equal to the total number (per time) of molecular ions formed without restriction as to internal energy content. For a single decomposition, eqn. (3) becomes... 

The heat losses for the infinite plate, infinite cylinder, and sphere are given in Figs. 4-14 to 4-16, where Qn represents the initial internal energy content of... 

In this case the system is composed of the reactant molecules S and O2 and the product molecules SO2. We do not know the internal energy content of either the reactant... 

To understand how the body s heating and cooling mechanisms operate, we can view the body as a thermodynamic system. The body increases its internal energy content by ingesting foods from the surroundings. The foods, such as glucose (C6Hi20g), are metabolized—a process that is essentially controlled oxidation to CO2 and H2O ... 

Koch. Rather drastic assumptions had to be made about the internal energy content of the CH2 ion. 

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