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15 Cards in this Set
- Front
- Back
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Thermochemistry |
The study of the transfers of energy as heat that accompany chemical reactions and physical changes. |
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Calorimeter |
The energy absorbed or released as heat in a chemical or physical change; measurement. |
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Temperature |
A measure of the average kinetic energy of the particles in a sample of matter. |
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Joules
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SI unit of heat as well as all other forms of energy.
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Heat
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The energy transferred between samples of matter because of a difference in their temperatures.
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Specific Heat
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The amount of energy required to raise the temperature of one gram of substance by one Celsius degree or one Kelvin.
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Enthalpy Change
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The amount of energy absorbed by a system as heat during a process at constant pressure.
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Enthalpy of Reaction
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The quantity of energy transferred as heat during a chemical reaction.
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Thermochemical Equation
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An equation that includes the quantity of energy released or absorbed as heat during the reaction as written.
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Molar Enthalpy of Formation
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The enthalpy change that occurs when one mole of a compound is formed from its elements in their standard state at 25C and 1 atm.
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Enthalpy of Combustion
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The energy released as heat by the complete combustion of specific amount of a substance at constant pressure or constant volume.
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Hess's Law
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The overall enthalpy change in a reaction is equal to the sum of enthalpy changes for the individual steps in the process.
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Entropy
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The measure of the degree of randomness of the particles, such as molecules, in a system; defined as "S".
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Free Energy
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The combined enthalpy-entropy function of a system,
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Free-energy Change |
At a constant pressure and temperature, the free-energy change, delta G, of a system is defined as the difference between the change in enthalpy, delta H, and the product of the Kelvin temperature and the entropy change, whose denied as T delta S. delta G = delta H - T delta S |
