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  2. Exothermic process - Wikipedia

    en.wikipedia.org/wiki/Exothermic_process

    Exothermic refers to a transformation in which a closed system releases energy (heat) to the surroundings, expressed by > When the transformation occurs at constant pressure and without exchange of electrical energy, heat Q is equal to the enthalpy change, i.e.

  3. Exothermic reaction - Wikipedia

    en.wikipedia.org/wiki/Exothermic_reaction

    The measured heat energy released in an exothermic reaction is converted to ΔH⚬ in Joule per mole (formerly cal/mol). The standard enthalpy change Δ H ⚬ is essentially the enthalpy change when the stoichiometric coefficients in the reaction are considered as the amounts of reactants and products (in mole); usually, the initial and final ...

  4. Cellular respiration - Wikipedia

    en.wikipedia.org/wiki/Cellular_respiration

    Although cellular respiration is technically a combustion reaction, it is an unusual one because of the slow, controlled release of energy from the series of reactions. Nutrients that are commonly used by animal and plant cells in respiration include sugar , amino acids and fatty acids , and the most common oxidizing agent is molecular oxygen ...

  5. Energy - Wikipedia

    en.wikipedia.org/wiki/Energy

    Energy transformations in the universe over time are characterized by various kinds of potential energy, that has been available since the Big Bang, being "released" (transformed to more active types of energy such as kinetic or radiant energy) when a triggering mechanism is available.

  6. ATP hydrolysis - Wikipedia

    en.wikipedia.org/wiki/ATP_hydrolysis

    As noted below, energy is released by the hydrolysis of ATP. However, when the P-O bonds are broken, input of energy is required. It is the formation of new bonds and lower-energy inorganic phosphate with a release of a larger amount of energy that lowers the total energy of the system and makes it more stable. [1]

  7. Exergonic reaction - Wikipedia

    en.wikipedia.org/wiki/Exergonic_reaction

    The change of Gibbs free energy (ΔG) in an exergonic reaction (that takes place at constant pressure and temperature) is negative because energy is lost (2). In chemical thermodynamics, an exergonic reaction is a chemical reaction where the change in the free energy is negative (there is a net release of free energy). [1]

  8. Nuclear fusion - Wikipedia

    en.wikipedia.org/wiki/Nuclear_fusion

    Nuclear fusion is the process that powers active or main-sequence stars and other high-magnitude stars, where large amounts of energy are released. A nuclear fusion process that produces atomic nuclei lighter than iron-56 or nickel-62 will generally release energy.

  9. Bioenergetic systems - Wikipedia

    en.wikipedia.org/wiki/Bioenergetic_systems

    Since energy is released when ATP is broken down, energy is required to rebuild or resynthesize it. The building blocks of ATP synthesis are the by-products of its breakdown; adenosine diphosphate (ADP) and inorganic phosphate (P i). The energy for ATP resynthesis comes from three different series of chemical reactions that take place within ...