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Further Analysis of Boiling Points of Small Molecules, CHwFxClyBrz

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Guy Beauchamp

Department of Chemistry, Collège de l''Outaouais, Gatineau, Québec J8Y 6M5, Canada

J. Chem. Educ., 2005, 82 (12), p 1842

DOI: 10.1021/ed082p1842

Publication Date (Web): December 1, 2005

Section:

History, Education, and Documentation

Abstract

One of the goals of physical chemistry is to better understand the relationships between the observed physical properties of molecules and the molecular or atomic parameters that may explain the macroscopic behavior. An article published in this Journal studied the boiling points of molecules having a similar structure (Laing, M. J. Chem. Educ. 2001, 78,1544–1550). Multiple linear regression analysis was useful in selecting predictor variables that could significantly clarify the boiling point variation of the CH_wF_xCl_yBr_z molecules. The important combination of the molar refraction (polarizability) and the weak H-bonding was emphasized in the development of a linear model equation ( r² = 0.998). In this group of molecules the dipole moment does not play a significant role in explaining the boiling point variation. There were no outliers.

Keywords (Audience):

First-Year Undergraduate / General

Keywords (Domain):

Physical Chemistry

Keywords (Pedagogy):

Analogies / Transfer

Keywords (Subject):

Chemometrics

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This article has been cited by 3 ACS Journal articles (3 most recent appear below).

An Analytical Approach for Relating Boiling Points of Monofunctional Organic Compounds to Intermolecular Forces
Jef Struyf
Journal of Chemical Education2011 Article ASAP
- An Analytical Approach for Relating Boiling Points of Monofunctional Organic Compounds to Intermolecular Forces
  Jef Struyf
  Journal of Chemical Education2011 Article ASAP
  The boiling point of a monofunctional organic compound is expressed as the sum of two parts: a contribution to the boiling point due to the R group and a contribution due to the functional group. The boiling point in absolute temperature of the ...
  Abstract | Full Text HTML | Hi-Res PDF | PDF w/ Links
Boiling Points of Halogenated Ethanes: An Explanatory Model Implicating Weak Intermolecular Hydrogen−Halogen Bonding
Guy Beauchamp
The Journal of Physical Chemistry A2008 112 (42), 10674-10680
- Boiling Points of Halogenated Ethanes: An Explanatory Model Implicating Weak Intermolecular Hydrogen−Halogen Bonding
  Guy Beauchamp
  The Journal of Physical Chemistry A2008 112 (42), 10674-10680
  This study explores via structural clues the influence of weak intermolecular hydrogen−halogen bonds on the boiling point of halogenated ethanes. The plot of boiling points of 86 halogenated ethanes versus the molar refraction (linked to polarizability) ...
  Abstract | Full Text HTML | Hi-Res PDF | PDF w/ Links
Helping Students Assess the Relative Importance of Different Intermolecular Interactions
Paul G. Jasien
Journal of Chemical Education2008 85 (9), 1222
- Helping Students Assess the Relative Importance of Different Intermolecular Interactions
  Paul G. Jasien
  Journal of Chemical Education2008 85 (9), 1222
  A semi-quantitative model has been developed to estimate the relative effects of dispersion, dipole–dipole interactions, and H-bonding on the normal boiling points (Tb) for a subset of simple organic systems. The model is based upon a statistical analysis ...
  Abstract | Hi-Res PDF | PDF w/ Links