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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.
Thermochemistry : SystemSurrExoEndo (4 Variations)
Sulfuric acid is added to water in a beaker and the resulting solution is much warmer than either the water or acid was initially.
Identify the following items as being part of the system or the surroundings, and indicate whether the process is exothermic or endothermic.
Predicting the Stability of Hypervalent MoleculesTracy A. Mitchell, Debbie Finocchio, and Jeremy Kua In this exercise, students use concepts in thermochemistry such as bond energy, ionization potentials, and electron affinities to predict the relative stability of two hypervalent molecules (PF5 and PH5) relative to their respective non-hypervalent counterparts. Mitchell, Tracy A.; Finocchio, Debbie; Kua, Jeremy. J. Chem. Educ.2007, 84, 629.
Computational Chemistry |
Covalent Bonding |
Ionic Bonding |
Lewis Structures |
Molecular Modeling |
Calorimetry / Thermochemistry |
Molecular Properties / Structure
E = mc2 for the Chemist: When Is Mass Conserved?Richard S. Treptow Einstein's famous equation is frequently misunderstood in textbooks and popular science literature. Its correct interpretation is that mass and energy are different measures of a single quantity known as massenergy, which is conserved in all processes. Treptow, Richard S. J. Chem. Educ.2005, 82, 1636.
Atomic Properties / Structure |
Nuclear / Radiochemistry |
Theoretical Chemistry |
Thermodynamics
The Lead-Acid Battery: Its Voltage in Theory and in PracticeRichard S. Treptow Lead-acid battery fundamentals, cell voltage and the Nernst equation, and an analysis of actual battery performance. Treptow, Richard S. J. Chem. Educ.2002, 79, 334.
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
Calorimetry / Thermochemistry
Measuring the Enthalpy ChangeEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Calorimetry / Thermochemistry
Bond EnthalpiesEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
