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  • Why do we still need to know about the Rankine temperature scale?
    The Rankine scale ( ˈræŋkɪn ) is an absolute scale of thermodynamic temperature named after the Glasgow University engineer and physicist William John Macquorn Rankine, who proposed it in 1859 (The Kelvin scale was first proposed in 1848 ) It may be used in engineering systems where heat computations are done using degrees Fahrenheit
  • Ranking order of nucleophilicity - Chemistry Stack Exchange
    The first thing to note is that nucleophilicity is a kinetic parameter that cannot be addressed easily with thermodynamic parameters such as electronegativity Instead, you need to inspect all potential nucleophiles by their kinetic merits One easy thing that we can use, even though it is thermodynamic, is the effective charge The centre of negative charge of the acetate molecule is
  • What happens to pressure when a liquid goes supercritical?
    Interesting that twice the pressure means half again the velocity in firearms, and twice the temperature seems to equal about half again the efficiency in Rankine-cycle power plants
  • thermodynamics - Is the ideal gas constant not a constant if Celsius is . . .
    If you consider temperature to be the measure of mean kinetic energy, then to get the correct linear scale, you'd need an absolute temperature The Kelvin scale (or the Rankine scale) provides that absolute temperature where in the limit of zero temperature, the system is in its lowest energy state
  • Why is the volume of one mole of gas 22. 4 or 22. 7 dm3?
    It will assume different units and values depending on for instance whether the pressure is expressed in units of atmosphere ($\pu {atm}$) or pascal ($\pu {Pa}$); temperature in degrees Kelvin or Rankine; or volume in pints or litres
  • evaporating DMSO Ethanol - Chemistry Stack Exchange
    However, you can say Celsius, Fahrenheit, or Rankine Preferably, don't use "°" for absolute temperature scales like kelvin or Rankine, and use $^\circ F$ or $^\circ C$ for Fahrenheit and Celsius scales, which are relative temperature scales
  • terminology - Can an element be a single atom or a molecule made up of . . .
    Here is one possible definition: each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter Each element is distinguished by its atomic number, i e the number of protons in the nuclei of its atoms Source: Oxford dictionary This starts with the classical definition (can not broken down into
  • Are there any major exceptions when comparing electron affinity?
    This exception rule is actually orbital filling rule For two electrons to be in same orbital they need to have different spins (Pauli exclusion principal) This electron pairing requires additional energy and thus it is easier to add electrons if there are free orbitals When element has a half-filled p sublevel all 3 orbitals have one electron and pairing takes place (difference between
  • Making hard water - Chemistry Stack Exchange
    Does anyone know how to make hard water with a hardness of 200+ ppm in terms of $\\ce{CaCO3}$? I live in Seattle and we have very soft water and we need hard water for testing purposes Obviously you
  • Reading and adjusting pH of reverse osmosis water
    What is "nearly naked water" ? Is it water obtained by reverse osmosis ? What is the pH of this original water? Is it not $5 6$ ? Usually demineralized water has a pH not far from $5 6$ when in contact with air





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