11 Questions 14 Answers 0 Followers
Questions related from Lothar Schuh
Hello, Enthalpy is a state variable that was invented because Heat Q is a process variable - right? ΔH = ΔU + ΔpV ΔH = Q – W + ΔpV ΔH = Q – pΔV + ΔpV (at constant p, isobaric) ΔH = Q – pΔV + pΔV...
11 November 2018 4,527 0 View
Hello, I need a low level educational book explaining the PRACTICAL use (and interrelationship) of dependent / independent variables, inextensive/intensive variables, internal/external variables...
07 July 2018 1,625 0 View
Hello, pressure p (intensive) and volume V (extensive) are thermodynamic state variables - independent on the way how a state was achieved. pdV =W is work and NOT a state variable, but a...
06 June 2018 3,809 24 View
Hello, the de Broglie relation says: wavelength= h/p (h=Planck const, p=momentum)....means: Lightwaves with a certain wavelength have a momentum. Then waves should set free an electron...
01 January 2018 8,840 4 View
Hello, according to the Second law of thermodynamic Heat Cannot be Transformed completely in work. A Part of the Heat is taken Up by a Reservoir of lower Temperature. WHat would Happen IF this...
05 May 2017 3,190 6 View
Hello, breathing on a cold window pane results in a thin film. The observation is: the diameter gets smaller with time and the edge is very dynamic! The center seems unchanged until the "shrinking...
02 February 2017 3,777 3 View
Hello, I got stuck in the thermodynamic problem. You place e.g. Zinc and HCl in an autoclave. Then the H2 evolvement starts.At which pressure will this isochoric reaction stop (pressure dependence...
02 February 2017 5,353 0 View
Hello, have a look at a glass of sparkling water or beer. When you observe it over a period of time and the initial heavy sparkling ceased you see a few stationary points, from which very tiny...
11 November 2016 1,395 3 View
hello everybody, can anyone privide me a graph showing the temperature-dependence of the solubility of citric acid in water? Best regards Lothar
09 September 2016 9,828 0 View
Hello, Consider 2 Molecules Citric Acid. Citric acid molecules carry -COOH and -OH Groups. Does the OH of Molecule 1 react with COOH of Molecule 2? Is there a self-esterification between these...
09 September 2016 8,624 3 View
Dear All, Final products of Biotech Downstream Separation are commercially relevant (Insulin, Penicillin, Cephalosporin, Enzymes etc). Some are within cells coming out of the fermenter and...
07 July 2016 5,014 2 View
