Thermochemistry

Thermochemistry is the study of the heat energy which is associated with chemical reactions and/or phase changes such as melting and boiling. A reaction may release or absorb energy, and a phase change may do the same. Thermochemistry focuses on the energy exchange between a system and its surroundings in the form of heat. Thermochemistry is useful in predicting reactant and product quantities throughout the course of a given reaction. In combination with entropy determinations, it is also used to predict whether a reaction is spontaneous or non-spontaneous, favorable or unfavorable.

chemical reaction that releases energy by light or heat; opposite of an endothermic reaction

relationship in physical chemistry

released or absorbed energy during a constant-temperature process

quantity measuring the energy per unit of mass or volume that some substance releases upon oxidation

(of compound) change of enthalpy during the formation of 1 mole of the substance from its constituent elements, with all substances in their standard states, and at a pressure of 1 bar (100 kPa)

Relation between temperature and the equilibrium constant of a chemical reaction

type of chemical reaction

thermodynamic process that absorbs energy from its surroundings

type of chemical reaction

approach to analyzing reaction energies

enthalpy change that occurs in a system when matter is transformed by a given chemical reaction, when all reactants and products are in their standard states

Cryochemistry is the study of chemical interactions at temperatures below . It is derived from the Greek word cryos, meaning 'cold'. It overlaps with many other sciences, including chemistry, cryobiology, condensed matter physics, and even astrochemistry.

cramps caused by heat

hypothesis in the history of thermochemistry

theorem that as absolute zero is approached, the entropy change ΔS for a chemical or physical transformation approaches 0

change in enthalpy during an acid-base reaction

Principle in physical chemistry

hydrogen production process