The large number of areas covered by the chemical energetics can be explained by the different forms in which chemical energy can be released: heat and combustion work, electrical energy in electrochemistry, radiant energy in chemiluminescent systems.
The chemical energy provided by a reaction reflects the energy balance associated with the electronic modifications suffered by the species involved.
From an energy point of view, a chemical reaction between molecules can be schematized in two stages. The first requires a supply of energy and corresponds to the rupture of the bonds of the reactant molecules with release of the atoms which constitute them.
The second releases energy and concerns the creation, by recombination of these atoms, of new bonds entering the structure of the reaction molecules.
As a general rule, the energy released in the second stage is greater than the first. We are talking about exothermic reaction. The difference between these two energies (reaction enthalpy) measures the amount of chemical energy transferred to the external environment.
It is conceivable that this quantity translates, not only the number, but also the strength of the connections involved.
It has properties of the ordinal level of measurement and
the differences in the values of the variable have meaning. A value of zero in
the interval level of measurement does not mean the absence of the quantity.
Arithmetic operations such as addition and subtraction can be performed on
values of the variable is called interval.
While nominal the values of the variables name, label or categorize. In
addition, the naming scheme does not allow values of the variables to be
arranged in a ranked or specific, order.
The answer would be C.
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