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# Principles Review

### Principles and Laws Review

Question | Answer |
---|---|

Pauli Exclusion Principle: | an atomic orbital may describe at most two electrons, each with opposite spin directions. |

Henry's Law: | at a given temperature the solubility of a gas in a liquid is directlt proportional to the pressure of the gas above the liquid. |

Heisenberg Uncertainty Principle: | it is impossible to know exactly both the volocity and the position of a particle at the same time. |

Hund's rule: | electrons occupy orbitals of the same energy in a way that makes the number of elecrons with the same spin direction as large as possible. |

Aufbau principle: | the rule that elecrons occupy the orbitals of lowest energy first. |

Boyle's Law: | for a given mass of gas at constant temperature, the volume of gas varies intervesely with pressure. |

Le Châtelier's Principle: | If stress is applied to a system in dynamic equilibrium, the system changes in a way that relieves the stress, dude! |

Dalton's law: | at constant volume and temperature, the total pressure exerted by a mixture of gasses is equal to the sum of the partial pressures of the component gases. |

Ideal gas law: | P x V= n x R x T or PV=nRT |

Gay-Lussacs Law: | a pressure of a gas is directly proportional to the Kelvin temperature if the volume remains constant. |

Charles's law: | the volume of a fixed mass of gas is directly proportional to its Kelvin temperature if the pressure is kept constant. |

Combined gas law: | Boyle's, Charles's and Gay-Lusac's laws combined. |

Graham's law of effusion: | the rate of effusion of a gas is inversely proportional to the square root of the gases's molar mass. |