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| Calorimeter | An instrument or device for determining and specifying colors; specifically: one used for chemical analysis by comparison of a liquid's color with standard colors,  |
| Enthalpy Change | Is a measure of the total energy of a thermodynamic system,  |
| Enthalpy of Combustion | Is the enthalpy change when one mole of a substance completely reacts under standard thermodynamic conditions,  |
| Enthalpy of Reaction | The standard enthalpy change of reaction (denoted ?rHo) is the enthalpy change that occurs in a system when one mole of matter is transformed by a chemical reaction under standard conditions.,  |
| Entropy | Is the quantitative measure of disorder in a system.,  |
| Free Energy | The component of the total energy of a system that can do work at constant temperature and pressure,  |
| Free-Energy Change | The energy that may be extracted from a system at constant temperature and pressure,  |
| Heat | Energy transferred from one body or thermodynamic system to another due to thermal contact when the systems are at different temperatures,  |
| Hess's Law | Overall enthalpy change in a reaction is equal to the sum of the enthalpy changes of the individual steps of the process,  |
| Joule | The SI unit of work or energy, equal to the work done by a force of one newton when its point of application moves through a distance of one meter in the direction of the force: equivalent to 10 7 ergs and one watt-second.,  |
| Molar Enthalpy of Formation | The enthalpy change of a chemical reaction in which one mole of a pure substance is formed from the free elements in their most stable states under standard state conditions.,  |
| Specific Heat | The heat required to raise the temperature of one gram of a substance one degree centigrade,  |
| Temperature | A measure of the warmth or coldness of an object or substance with reference to some standard value.,  |
| Thermochemical Equation | Is a balanced stoichiometric chemical equation that includes the enthalpy change, delta H,  |
| Thermochemistry | A branch of chemistry that deals with the interrelation of heat with chemical reaction or physical change of state,  |
