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Entropy These processes are shown in reverse. The situations shown are so highly improbable that we would not expect to observe them in nature.
Thermodynamics
Endothermic Reaction Solid barium hydroxide octahydrate (Ba(OH)2*8H2O) and ammonium thiocyanate (NH4SCN) are mixed in a beaker, which is then placed on a few drops of water on a small board. The reaction that occurs is highly endothermic.
Consider the graph above. Which of these substances has the highest specific heat capacity?
Calorimetry / Thermochemistry |
Heat Capacity
Thermochemistry : HeatCapacityLiq (4 Variations)
100 g of water (c=4.184 J/g.oC), 100 g of ethanol (c=2.46 J/g.oC), 100 g of carbon tetrachloride (c=0.861 J/g.oC), and 100 g of ethylene glycol (c=2.42 J/g.oC) at 50oC were each placed into a separate coffee cup calorimeter and the temperature recorded. The temperature of the surroundings was 20oC. After one hour the temperature of which substance would have changed by the largest amount? Assume that the rate of heat transfer from the coffee cup to the surroundings was the same in each case.
In an experiment, 50 g of a metal was heated to 100oC and placed in 200 g of a liquid at 25oC. Which of the following combinations of metal and liquid will produce the largest temperature increase in the liquid? (Assume that there is no transfer of energy to the surroundings.)
Heat and Work are Not "Forms of Energy" Peckham, Gavin D.; McNaught, Ian J. Heat and work are processes by which the internal energy of a system is changed. The title reflects a common misconception used by students and instructors. Peckham, Gavin D.; McNaught, Ian J. J. Chem. Educ.1993, 70, 103.
C-H-E-M spells "chemistry is fun": An outline for a very involving chemistry demonstrationSherman, Marie C. The striking features of the demonstration can be outlined using the first four letters of the word chemistry. C-H-E-M is used as an acronym to introduce what the students will actually see, hear, feel, and experience during the demonstration. Sherman, Marie C. J. Chem. Educ.1992, 69, 413.
Heat CapacitiesEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Heat Capacity
Heat Capacity and Microscopic ChangesEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Heat Capacity |
Kinetic-Molecular Theory
Standard Enthalpies of FormationEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
