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# Principles Review

### Principles and Laws Review

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.
Created by: jmhschemistry