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# Chem Test 2 Stack

### Spontaneous Change and Equilibrium

Term | Definition |
---|---|

Spontaneous Change | Change taking place without outside intervention |

Entropy | State property of chemical and physical terms that depends on the number of microstates available to its molecules |

Microstates | Possible accessible microscopic states or arrangements of molecules |

3rd Law of Thermodynamics | Entropy of any crystalline substance approaches zero as the absolute zero of temperature is approached |

Standard Molar Entropy | Absolute entropy of 1 mol of a substance in a standard state |

2nd Law of Thermodynamics | Entropy of a system may increase or decrease in a spontaneous process, but when the entropy of the surroundings is added, the total must always increase |

Gibbs Energy | A state property without reference to the surroundings that exists if consideration is restricted to processes at constant temperature and pressure |

Trouton's Rule | In the conversion between liquid and vapor, the entropy change at boiling point approximates 88JK-1mol-1 |

Gibbs Energy of Reaction | Equals the difference between the sum of the Gibbs energies of the products and the sum of the Gibbs energies of the reactants |

Standard Molar Gibbs Energies of Formation | The change in Gibbs energy when 1 mol of a substance forms in a standard state at a specified temperature from the most stable forms of its constituent elements in standard states at the same temperature |

Standard Gibbs Energy of Reaction | Gibbs energy change when reactants in standard states give products in standard states a specified temperature |

Van't Hoff Equation | Allows for the calculation of K at a second temperature, in the approximation that enthalpy and entropy are constant |

Clausius-Clapeyron Equation | The vapor pressure at any given temperature can be estimated if it is known at some other temperature and if the enthalpy of vaporization is also known |

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