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# Chem unit 3 test

### CU chemistry test unit 3 chapters 11 and 5

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

conversion of mmHg to atm | 760mmHg = 1 atm |

Conversion of mmhg to bar | 760mmHg = 1.01325 bar |

conversion of atm to kPa | 1 atm = 101.325 kPa |

What is a pascal (Pa), relation of a kPa to Pa and relation of bar to Pa. | A pascal is one newton-meter, a kPa is 1000 Pa, a bar is 100000 Pa. |

What is boyle's law? what is constant? | P1V1=P2V2 with temperature constant |

What is charles law adn what is constant | V1/T1=V2/T2 with pressure constant |

PV=nRT what do each stand for? | P=pressure V=volume n=moles R=gas constant T=temperature |

the general gas law | PV/T=P2V2/T2 |

THE ideal gas law | PV=nRT |

WHat are the density of gases equations? | d=m/v=PM/RT PV=(m/M)RT |

Dalton's law | P(total)=P(1)+P(2)+P(3)...... which can translate to P(total)=(n1+n2+n3)(RT/V) or P(total)=n(total)(RT/V) |

Average kinetic energy can be shown by these equations | 1/2mu^2(speed is average)or KE(average)=3/2RT which leads to >>> The square root of (u^2)=the square root of (3RT/M) where M = molar mass |

The gas constant when dealing with energy is what?? | 8.314 J/K*mol |

Graham's law.... | Rate of effusion of gas 1/ rate of effusion of gas 2= the square root of (molar mass of gas 2/molar mass of gas 1) |

Kinetic engergy and different types of kinetic engergy | Energy associated with motion. thermal energy, mechanical energy, electrical energy, and acoustic energy. |

Thermal energy | the motion of atoms molecules r ions at the submicroscopic level |

mechanical energy | the motion of macroscopic objects like moving a tennis ball or an automobile |

electrical energy | the movement of electrons through a conductor |

acoustic energy | the compression and expansion of the spaces between molecules in the transmission of sound. |

potential energy and different types of potential energy | results from an objects position. gravitational energy, chemical energy, electrostatic energy |

gravitational energy | energy posssesed by a ball held above the floor and by water at the top of a waterfall |

chemical energy | energy stored in fuels |

electrostatic energy | the energy associated with the separation of two electrical charges |

Law of conservation of energy | energy can neither be created or destroyed. The total energy of the universe is constant |

System is | defined as an object or collection of objects being studied. |

Surroundings | include everything outside the system that can exchange energy and/or matter with the system. |

thermal equilibrium | point when at a macroscopic scale no temperature change is evident, yet at the microscopic level change is still going on. |

exothermic process | energy is transferred as heat from a system ot its surroundings. the energy of the system decreases and the energy of hte surroundings increases |

an endothermic process | is the opposite of an exothermic process. Energy is transferred as heat from the surroundings to the system, increasing the energy of the system, decreasing the energy of the surroundings. |

joule and its relation to calorie's | Kg*m^2/s^2 1 calorie is equal to 4.184 joules |

specific heat capacity (C) | the energy transferred as heat that is required to rais the temperature of 1 gram of a substance by one kelven |

equation used with specific heat | q=C*m*Change in T |

How is change in temperature calculated? | Change in temperature = T(final)-T(initial) |

When dealing with a metal in water.... what simple equation ensues? why? | q(water)+q(metal)=0 because of the law of thermodynamics no energy is created or destroyed, and theoretically if all is transfered as heat then it will completely transfer over. |

Heat of fusion | the energy transferred as heat that is required to convert a substance form a solid at its melting point to a liquid |

Heat of vaporization | the energy transferred as heat to convert a liquid at its boiling point to a gas. |

sublimation | the direct conversion of a solid to a gas |

Heat of fusion equation | q=heat of fusion x mass |