| Term | Definition |
|---|
| Joule | 1 kg(m/s)^2 |
| Calorie | Raises 1g water by 1K |
| Work | Energy exerted to move an object with mass against a force |
| Heat | Energy transferred from a hotter object to a colder object |
| Energy | Capacity to do work or transfer heat |
| Internal Energy | Sum of all the kinetic and potential energies of the components of a system |
| First Law of Thermodynamics | Energy can neither be created nor destroyed |
| ΔE | Sum of heat transfer and work |
| q > 0 | Heat is transferred to a system |
| q < 0 | Heat is lost by a system |
| w > 0 | Work is done on a system |
| w < 0 | Work is done by a system |
| ΔE > 0 | Net gain of energy by system |
| ΔE < 0 | Net loss of energy by system |
| State Function | Value depends only on the present state of the system |
| Enthalpy | Sum of internal energy and pressure times volume |
| ΔH | q(p), Heat flow at constant pressure |
| ΔH > 0 | Endothermic process |
| ΔH < 0 | Exothermic process |
| Pressure-Volume Work | Negative product of pressure and volumetric change |
| ΔH(rxn) | H(products) - H(reactants) |
| Enthalpy of Reaction | Proportional to amount and physical states of reactants and products |
| Heat Capacity | Heat required to raise the temperature of a system by 1K |
| Molar Heat Capacity | Heat capacity of 1mol of a pure substance |
| Specific Heat | Heat capacity of 1g of a pure substance |
| Heat Flow | Product of specific heat, mass, and temperature change |
| Hess's Law | Enthalpy of reaction is independent of the number of steps |
| Enthalpy of Formation | Enthalpy of reaction for the formation of a substance from its constituent elements |
| Standard Enthalpy of Formation | Enthalpy of reaction yielding 1mol product at STP |
| Fuel Value | Heat evolved when one gram of a substance is combusted |
| ΔH°(rxn) | ∑nΔH°(f,products) - ∑mΔH°(f,reactants) |
| 0 | ΔH°(f) for any element in its most stable form at STP |
| w | ΔE - ΔH |
| ΔE | q(v), Heat flow at constant volume |
| ΔE | Property measured via bomb calorimetry |
Combine with other sets
Share on Facebook
Share on MySpace
!