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# Ch 10 voc Justen

### Voc for gases

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

diffusion | spontaneous mixing of the particles of two substances caused by their random motion |

effusion | a process by which gas partially pass through a tiny opening |

elastic collision | a collision between gas particles and between gas particles and container walls in which there is no net loss of kinetic energy |

fluid | a substance that can flow and therefore take the shape of its container; a liquid or gas |

ideal gas | an imaginary gas that perfectly fits the assumptions of the kinetic-molecular theory |

kinetic-molecular theory | a theory based on the idea that particles of matter are always in motion |

real gas | a gas that does not behave completely according to the assumption of the kinetic molecular theory |

atmosphere of pressure (atm) | exactly equivalent |

barometer | a device used to measure atmospheric pressure |

millimeter of mercury (mm of Hg) | a common unit of pressure |

newton | the SI unit for force; the force that will increase the speed of a one kilogram mass by one merer per second |

pascal | the pressure exerted by a force of one newton acting on an area of one square meter |

kilopascal | is a unit for measureing pressure |

pressure | the force per unit area of a surface |

standard temperature and pressure (STP) | the agreed upon standard conditions of exactly 1 atm pressure and 0 C |

standard ambient temperature and pressure (SATP) | corresponds to 25C, 1 bar |

torr | non-SI unit with the ratio of 760 to 1 standard atmosphere |

absolute zero | the temperature -273.15 C, given a value of zero in the kelvin scale |

Kelvin | temperature scale used in chemistry and physics |

Boyle’s Law | the volume of a fixed mass of gas varies inversely with pressure at a constant temperature |

Charles’s Law | the volume of a fixed amount of gas at a constant pressure varies directly with the Kelvin temperature |

Combined gas law | the relationship between the pressure,volume, and temperature of a fixed amount of a gas |

Dalton’s Law of partial pressure | the total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases |

Gay-Lusscac’s Law | the pressure of a fixed mass of gas at a constant volume varies directly with the kelvin temperature |

Ideal gas law | an imaginary gas that perfectly fits all the assumptions of the kinetic-molecular theory |

Partial pressure | the pressure of each gas in a mixture |

Avogadro’s Law | equal volumes if gases at the same temperature and pressure contain equal numbers of molecules |

van der Waals equation | An equation of state that relates the pressure, volume, and absolute temperature of a gas taking into account the finite size of molecules, and their intermolecular attraction |

bar | a unit of pressure equal to 100 kilopascals |

Gas Constant | a constant, equal to 8.314 joules per Kelvin or 1.985 calories per degree Celsius, that is the constant proportionality in equation Pressure x Volume is n x R x Temperature, relating the pressure and volume of a quantity of gas to the absolute temperature |

Created by:
Justen Rhyne