Chapter 13- Chemical Thermodynamics Flashcards
Enthalpy (H)
The heat content of a system at a constant pressure
Thermochemistry
The branch of science that studies the transfer of energy during chemical reactions or phase changes
Calorimeter
An insulated container similar to a thermos in which a thermometer detects the temperature change that occurs during a chemical reaction
Sensible heat
Heat that produces a temperature change in the substance when applied
Latent heat
Heat that produces a phase change. No temperature change is observed
Molar enthalpy of fusion
The quantity of heat required to melt one mile of a solid to a liquid with no temperature change
Molar enthalpy of vaporization
The amount of heat required to convert a mile of a liquid at its boiling point to its vapor at the same temperature
Specific heat
The amount of heat required to raise the temperature of 1g of the substance by 1C
Enthalpy of reaction
The change in enthalpy that occurs during a reaction
Thermochemical equation
A chemical equation that shows the reactants, products, and amount of energy that is released or absorbed as heat
Molar enthalpy of formation
The change in enthalpy that occurs when one mile of the compound is formed from it’s elements
Standard state
25 C (298 K) and 1 atm
Standard molar enthalpy of formation
The enthalpy change for the reaction that produces 1 mil of a compound in its standard state from its element in their standard states
Standard molar enthalpy of combustion
The energy released as heat by the complete burning of one mile of a substance at standard conditions
Hess’s law
That the enthalpy change of a reaction equals the sum of the enthalpy changes for each step of the process
