13a Flashcards
The branch of science that studies the transfer of energy during chemical reactions or phase changes
Thermochemistry
Measures the total amount of thermal energy transferred from one substance to another
Heat
What is heat measured in
Joules or kilojoules
The standard SI unit of work and can be used to measure any kind of energy
Joule
The thermal energy content of a system at a constant pressure
Enthalpy (H)
Heat that produces a phase change
Latent heat
The amount of thermal energy required to raise the temperature of 1 g of the substance by 1°C
Specific heat (C{sp})
Heat that produces a temperature change in the substance when applied
Sensible heat
The enthalpy change for the reaction that produces one mole of a compound in its standard state from its elements in their standard states
Standard molar enthalpy of formation (/\H’{f})
Reactions that produce energy in the form of heat and light
Combustion
The energy released as heat by the complete burning of one mole of a substance at standard conditions
Standard molar enthalpy of combustion (/\H’{c})
The enthalpy change of the reaction equals the sum of The enthalpy changes for each step of the process
Hess’s law
The quantity of thermal energy required to melt one mole of a solid to a liquid with no temperature change
Molar enthalpy of fusion
/\H{fus}
The quantity of thermal energy required to convert one mole of a liquid at its boiling point to its vapor at the same temperature
Molar enthalpy of vaporization (/\H{fus})
The change in enthalpy that occurs during a reaction. It is equal to the difference between the enthalpy of the products and the enthalpy of the reactants
Enthalpy (heat) of reaction (/\H)
