Submitted on: 24 August 2006.
Revised on: 26 October 2006.
Accepted on: 16 November 2006.
___________________JOURNAL OF CHEMICAL EDUCATION---AMER CHEMICAL SOC
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Submitted on: 27 February 2010.
Revised on: 27 April 2010.
Accepted on: 15 May 2010.
___________________JOURNAL OF CHEMICAL EDUCATION---AMER CHEMICAL SOC
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Submitted on: 16 July 2013.
Revised on: 10 September 2013.
Accepted on: 23 October 2013.
___________________JOURNAL OF CHEMICAL EDUCATION---AMER CHEMICAL SOC