Glossary

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heat of formation: The heatEnergy transferred as a result of a temperature difference; a form of energy stored in the movement of atomic-sized particles. energyA system's capacity to do work. transfer into a system during the formation of one moleThat chemical amount of a substance containing the same number of units as 12 g of carbon-12. of a compoundA substance made up of two or more elements and having those elements present in definite proportions; a compound can be decomposed into two or more different substances. from its component elements in their most stable forms.

Term of the Day

The enthalpyA thermodynamic state function, symbol H, that equals internal energy plus pressure x volume; the change in enthalpy corresponds to the energy transferred as a result of a temperature difference (heat transfer) when a reaction occurs at constant pressure. change when one moleThat chemical amount of a substance containing the same number of units as 12 g of carbon-12. of a compoundA substance made up of two or more elements and having those elements present in definite proportions; a compound can be decomposed into two or more different substances. is produced from its elements, each in their most stable form at a given temperatureA physical property that indicates whether one object can transfer thermal energy to another object. and standard pressureForce per unit area; in gases arising from the force exerted by collisions of gas molecules with the wall of the container. (1 bar). Also called standard heat of formationThe heat energy transfer into a system during the formation of one mole of a compound from its component elements in their most stable forms..