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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.)
A Simple Calorimetric Experiment That Highlights Aspects of Global Heat Retention and Global WarmingJoel D. Burley and Harold S. Johnston In this laboratory experiment, general chemistry students verify that heat is consumed in the melting of ice, with no increase in temperature until all the ice has melted. The fundamental calorimetric principles demonstrated by the lab results are then developed to help students better assess and understand the experimental evidence associated with global warming. Burley, Joel D.; Johnston, Harold S. J. Chem. Educ.2007, 84, 1686.
Atmospheric Chemistry |
Calorimetry / Thermochemistry
Thermochemical Analysis of Neutralization Reactions: An Introductory Discovery ExperimentKenneth V. Mills and Louise W. Guilmette Describes a guided-inquiry laboratory pedagogy in which students discover chemical concepts in the lab and the instructor uses their pooled data to guide the lecture portion of the course. This method is illustrated by an experiment that reinforces students' understanding of stoichiometry and allows them to discover neutralization reactions and thermochemistry. Mills, Kenneth V.; Guilmette, Louise W. J. Chem. Educ.2007, 84, 326.
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
