Energy - Wikipedia In the context of chemistry, energy is an attribute of a substance as a consequence of its atomic, molecular, or aggregate structure Since a chemical transformation is accompanied by a change in one or more of these kinds of structure, it is usually accompanied by a decrease, and sometimes an increase, of the total energy of the substances involved Some energy may be transferred between the
Chemical energy - Wikipedia Chemical potential energy is a form of potential energy related to the structural arrangement of atoms or molecules This arrangement may be the result of chemical bonds within a molecule or interactions between them Chemical energy of a chemical substance can be transformed to other forms of energy by a chemical reaction
Specific energy - Wikipedia Specific energy or massic energy is energy per unit mass It is also sometimes called gravimetric energy density, which is not to be confused with energy density, which is defined as energy per unit volume
Chemical thermodynamics - Wikipedia Chemical energy is the energy that can be released when chemical substances undergo a transformation through a chemical reaction Breaking and making chemical bonds involves energy release or uptake, often as heat that may be either absorbed by or evolved from the chemical system [citation needed]
Bond energy - Wikipedia In chemistry, bond energy (BE) is one measure of the strength of a chemical bond It is sometimes called the mean bond, bond enthalpy, average bond enthalpy, or bond strength [1][2][3] IUPAC defines bond energy as the average value of the gas-phase bond-dissociation energy (usually at a temperature of 298 15 K) for all bonds of the same type
Energy density - Wikipedia When discussing the chemical energy contained, there are different types which can be quantified depending on the intended purpose One is the theoretical total amount of thermodynamic work that can be derived from a system, at a given temperature and pressure imposed by the surroundings, called exergy Another is the theoretical amount of electrical energy that can be derived from reactants
Energy level - Wikipedia The energy spectrum of a system with such discrete energy levels is said to be quantized In chemistry and atomic physics, an electron shell, or principal energy level, may be thought of as the orbit of one or more electrons around an atom 's nucleus