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15 Cards in this Set
- Front
- Back
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the branch of chemistry that is the study of the energy changes that accompany chemical reactions and changes of state.
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thermochemistry
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a device used to measure the energy as heat absorbed or released in a chemical or physical change.
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calorimeter
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a measure of how hot or cold something is; a measure of the average kinetic energy of the particles in an object.
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temperature
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the unit used to express energy; equivalent to the amount of work done by a foce of 1N acting through a distance of 1m in the direction of the force
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joule
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the energy transferred between objects that are at different temperatures; energy is always transferred from higher-temperature objects to lower-temperature objects until thermal equilibrium is reached.
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heat
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the quantity of heat required to raise one unit mass of homogeneous material 1K or 1C in a specified way given constant pressure and volume.
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specific heat
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the amount of energy released or absorbed as heat by a system during a process at constant pressure.
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enthalpy of change
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the amount of energy released or absorbed as heat during a chemical reaction.
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enthalpy of reaction
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an equation that includes the quantity of energy as heat released or absorbed during the reaction as written.
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thermochemical equation
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the amount of energy as heat resulting from the formation of 1 mol of a substance at constant pressure.
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molar enthalpy of formation
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the energy released as heat by the complete combustion of a specific amount of a substance at constant pressure of constant volume.
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enthalpy of combustion
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the overall enthalpy change in a reaction is equal to the sum of the enthalpy changes for the individual steps in the process.
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Hess's law
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a measure of the randomness or disorder of a system.
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entropy
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the energy in a system that is available for work; a system's capacity to do useful work.
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free energy
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the difference between the change in enthalpy, ^H, and the product of the Kelvin temperature and the entropy change, which is defined as T^S, at a constant pressure and temperature.
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free-energy change
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