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The kinetic order of any elementary reaction or reaction step is equal to its molecularity, and the rate equation of an elementary reaction can therefore be determined by inspection, from the molecularity. [1] The kinetic order of a complex (multistep) reaction, however, is not necessarily equal to the number of molecules involved.
The invariance properties of molecular descriptors can be defined as the ability of the algorithm for their calculation to give a descriptor value that is independent of the particular characteristics of the molecular representation, such as atom numbering or labeling, spatial reference frame, molecular conformations, etc. Invariance to molecular numbering or labeling is assumed as a minimal ...
As an example, consider the gas-phase reaction NO 2 + CO → NO + CO 2. If this reaction occurred in a single step, its reaction rate ( r ) would be proportional to the rate of collisions between NO 2 and CO molecules: r = k [ NO 2 ][CO], where k is the reaction rate constant , and square brackets indicate a molar concentration .
Molecularity in chemistry is the number of colliding molecular entities that are involved in a single reaction step. While the order of a reaction is derived experimentally, the molecularity is a theoretical concept and can only be applied to elementary reactions .
Molecularity in chemistry is the number of colliding molecular entities that are involved in a single reaction step. A reaction step involving one molecular entity is called unimolecular. A reaction step involving two molecular entities is called bimolecular. A reaction step involving three molecular entities is called trimolecular or termolecular.
For example 'hydrogen molecule' is an adequate definition of a certain molecular entity for some purposes, whereas for others it is necessary to distinguish the electronic state and/or vibrational state and/or nuclear spin, etc. of the hydrogen molecule."
A simple Job Plot showing how a physical property (P) changes upon changing the mole fraction of compound A (Χ A).. In solutions where two species are present (i.e. species A and species B), one species (A) may bind to the other species (B).
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