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# Chapter 10 Voca

Question | Answer |
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Diffusion | Spontaneous mixing of the particles of two substances caused by their random motion. |

effusion | A process by which gas particles pass through a tiny opening. |

elastic collision | A collision 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 it’s container; a liquid or a gas. |

ideal gas | An imaginary gas that perfectly fits all 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 assumptions of the kinetic-molecular theory. |

atmosphere of pressure (atm) | Exactly equivalent to 760mm Hg. |

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 meter per second each second it is applied. |

pascal | The pressure excerpted by a force of one newton acting on an area of one square meter. |

kilopascal | The multiplet of peaks you see in the ESR spectrum. |

pressure | The force per unit area on a surface. |

standard temperature and pressure (STP) | The agreed-upon standard conditions of exactly 1 atm pressure and 0 degrees celsius. |

standard ambient temperature and pressure (SATP) | The maximum and minimum amounts by which the pressure varies from normal ambient pressure. |

torr | A type of vacuum pump capable of pressures down to .01 torr. |

absolute zero | The temperature -273.15 C given a value of zero in the Kelvin scale. |

Kelvin | The temperature scale used in chemistry, physics and some engineering calculations. Zero degrees Kelvin (-273 centigrade) is the temperature at which all thermal motion ceases. |

Boyle’s Law | The volume of a fixed mass of gas |

Charles’s Law | The volume of a fixed mass of gas at constant pressure varies directly with the kelvin temperature. |

Combined gas law | A measure of the relative tendency of an atom to attract electrons to itself when chemically combined with another atom. |

Dalton’s Law of partial pressure | States that the total pressure exerted by a gaseous mixture is equal to the sum of the partial pressures of each individual component in a gas mixture. |

Gay-Lusscac’s Law | States that the pressure of a sample of gas at constant volume, is directly proportional to its temperature in Kelvin. |

Ideal gas law | One in which all collisions between atoms or molecules are perfectly eleastic and in which there are no intermolecular attractive forces. |

Partial pressure | Which is the pressure which the gas would have if it alone occupied the volume. |

Avogadro’s Law | Two given samples of an ideal gas, at the same temperature, pressure and volume, contain the same number of molecules. |

van der Waals equation | Is an equation of state for a fluid composed of particles that have a non-zero volume and a pairwise attractive inter-particle force. |

bar | 100 kPa |

Gas Constant | Is a physical constant which is featured in a large number of fundamental equations in the physical sciences, such as the ideal gas law and the Nernst equation. |