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# Chem Chap 11

### Gases - Section 1

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

the amount of force exerted per unit area of a surface | Pressure |

the SI unit for force; the force that will increase the speed of a 1 kg mass by 1 m/s each second that the force is applied (symbol, N) | newton |

an instrument that measures atmospheric pressure | barometer |

a unit of pressure | millimeter of mercury |

the pressure of Earth's atmosphere at sea level; exactly equivalent to 760 mm Hg | atmosphere of pressure |

the SI unit of pressure; equal to the force of 1 N exerted over an area of 1 m2 (symbol, Pa) | Pascal |

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

the law that states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases | Dalton's law of partial pressure |

The pressure exerted by a gas depends on | volume, temperature, and the number of molecules present |

The force per unit area on a surface | Pressure (P) |

What is the formula for Pressure | Force / Area |

The SI unit for force | Newton |

the shell of air surrounding Earth | atmosphere |

sum of the individual pressures of the various gases in the atmosphere | atmospheric pressure |

The first type of barometer was introducted by | Evangelista Torricelli |

at sea level and at 0°C, the average pressure of the atmosphere can support a | 760 mm column of mercury |

The atmospheric pressure at any given place depends on | The elevation and the weather conditions |

If the atmospheric pressure is greater than the average at sea level, the height of the mercury column in a barometer will be | Greater than 760 mm |

If the atmospheric pressure is less than the average at sea level, the height of the mercury column in a barometer will be | Less than 760 mm |

Used to measure the pressure of an enclosed gas sample | manometer |

symbolizes millimeter of mercury | mm Hg |

A pressure of 1 mm Hg is also called | 1 torr in honor of Torricelli |

Symbol Pa stands for | Pascal |

The formula for 1 Pa is | 1 N / m2 |

1 torr = | 1 mm Hg |

Symbol atm stands for | atmosphere |

1 atm = | 760 mm Hg ; = 760 torr ; 1.013 25 x 10 5 Pa ; 101.325 kPa |

Symbol psi stands for | Poiunds per square inch |

1 psi = | 6.892 86 × 10 3 Pa |

1 atm relationship to a psi = | 14.700 psi |

Express an atmospheric pressure of 0.830 atm in millimeter of mercury | mm Hg = 760 mm Hg; 0.830 atm x 760 mm Hg/atm = 631 mm Hg |

Express an atmospheric pressure of 0.830 atm in kilopascals | 101.325 kPa = 1 atm ; 0.830 atm x 101.325 kPa/atm = 84.1 kPa |

The pressure exerted by each gas in an unreactive mixture is independent or dependent of that exerted by other gases present | independent |

The True or False: Dalton's law is true regardless of the number of different gases that are present | True |

Dalton’s law may be expressed as | PT = P1 + P2 + P3 + . . . |

A gas collected by water displacement is not pure but is always mixed with | water vapor |

Patm = | Pgas + PH2O |

The barometric pressure and the temperature during the experiment were 731.0 torr and 20.0°C, respectively. What was the partial pressure of the oxygen collected? | Patm = 731.0 torr PH2O = 17.5 torr Patm = PO2 + PH2O PO2 = Patm − PH2O PO2 = 731.0 torr − 17.5 torr = 713.5 torr |