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Posted by on Aug 30, 2013 in Physical Chemistry, General Science | 3 comments

Physical Chemistry – Overview of Thermodynamics

In one example I use bond energies to calculate the energy per mole of sucrose and TNT (the explosive trinitrotoluene). Most students expect that TNT has more energy, but it turns out the two have about the same. So why is TNT an explosive (actually a conflagration)? TNT burns rapidly and involves a huge volume change. It is the rate of reaction (chemical kinetics) and the rapid volume change that causes the explosive damage. Then I can move to the thermodynamics overview.

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Posted by on Jun 6, 2011 in Physical Chemistry | 0 comments

The Chemical Kinetics of Sobering Up

The time to reduce 4 beers to 2 is two hours. The time to go from 2 beers to 1 is one hour, and the time to go from 1 beer to the legal limit is 30 minutes. It therefore takes a whooping 3.5 hours to reach the legal limit: 4 beers take seven times longer to metabolize than 1 beer.

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Posted by on Feb 4, 2010 in General Science | 0 comments

Plotting Chemical Kinetics–steady state

In this video one of the many uses of plotting in the ebooks is given.  The example is first order consecutive reactions where the rate equations for the the concentration changes are plotted.  By varying the rate constants so that the first is ten times smaller than the second, the steady state approximation is explained. Buy the General Chemistry Tutorial from MCH Multimedia:  General Chemistry can be used alone or in conjunction with any introductory chemistry text book. In this module, all the topics found in AP (Advanced Programs in High School), and college level General Chemistry courses are covered.  Learn in depth by working through the modules which are presented with clear verbal instructions and descriptions about chemical processes.  There are many places where you can plot results and do...

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