| Term |
 |
|
| Definition |
|
|
| Thermochemistry |
Study of the heat effects associated with chemical reactions |
| Heat |
Form of motion at the molecular level by which energy is transferred between materials |
| Calorimetry |
Quantitative study of heat: the measurement of how much heat is evolved or absorbed in chemical reactions |
| Heat Capacity |
Amount of heat needed to raise its temperature by one unit of temperature |
| Molar Heat Capacity |
Heat capacity per mole of a substance |
| Specific Heat Capacity |
Heat capacity per unit mass of material |
| Enthalpy |
Amount of heat absorbed |
| State Property |
Depends only on the state of the system and not on the path followed to reach that state |
| Exothermic |
Reaction in which heat is evolved |
| Endothermic |
Reaction in which heat is absorbed |
| Hess's Law |
When several chemical equations are added or subtracted to give an overall equation, additon or subtraction of the corresponding enthalpy changes gives the enthalpy change associated with the overall equation |
| Standard Molar Enthalpy of Formation |
Equals the enthalpy change when 1 mol of a species is formed in a standard state at a specified temperature from the most stable forms of the elements that constitute it |
| Bond Enthalpies |
Used to estimate standard enthalpies of gas-phase reactions |
| Work |
Increases a body's energy |
| Pressure-Volume Work |
Expansion of a system against, or its compression by, an external pressure |
| 1st Law of Thermodynamics |
Change in internal energy of a system is the sum of the work done on it and the heat transferred to it |
HHS Shrek
