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Sulfuric Acid into Water and Ice When sulfuric acid is mixed with water the temperature rises. When sulfuric acid is added to ice, the temperature rises at first, but as the ice melts, the temperature falls.
Calorimetry / Thermochemistry
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.)
[#94] Hold the Heat: Global Heat Retention, Global Warming and CalorimetryJoel D. Burley and Harold S. Johnston Students perform quantitative calorimetric measurements on samples of ice/water heated by incandescent light bulbs and by convection with room-temperature surroundings. Burley, Joel D.; Johnston, Harold S. J. Chem. Educ.2008, 85, 224A.
Calorimetry / Thermochemistry
CalorimetryJCE Editorial Staff Lists articles describing laboratory exercises using calorimetry measurements. J. Chem. Educ.2008, 85, 1130.
Calorimetry / Thermochemistry
An Inexpensive Solution CalorimeterEmma Kavanagh, Sam Mindel, Giles Robertson, and D. E. Peter Hughes Describes the construction of a simple solution calorimeter, using a miniature bead thermistor as a temperature-sensing element, that has a response time of a few seconds and made it possible to carry out a thermometric reaction in under a minute. Kavanagh, Emma; Mindel, Sam; Robertson, Giles; Hughes, D. E. Peter. J. Chem. Educ.2008, 85, 1129.
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
ChemPaths 104 F Mar 25John W. Moore Today in Chem 104:
* Lecture: Thermochemistry
* Reading:
Kotz: Review Ch. 5, Sec. 1-8
Moore: Review Ch. 6, Sec. 1-10
* Homework #8 due by 11:55 PM F Apr 1
* Quiz in second discussion section next week
