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Simple Dynamic Models for Hydrogen Bonding Using Velcro-Polarized Molecular Models

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Emeric Schultz

Department of Chemistry, Bloomsburg University, Bloomsburg, PA 17815

J. Chem. Educ., 2005, 82 (3), p 401

DOI: 10.1021/ed082p401

Publication Date (Web): March 1, 2005

Section:

History, Education, and Documentation

Abstract

This article describes the use of models that dynamically illustrate the unique characteristics of weak intermolecular interactions, specifically hydrogen bonds. The models clearly demonstrate that H-bonds can break and reform while covalent bonds stay intact. The manner in which the models form and break H-bonds reflects the geometric and statistical manner in which H-bonding actually occurs and is not contrived. The use of these models addresses a significant area of student misconceptions. The construction of these molecular models is described. The materials required are easily obtained wooden ball knobs, Styrofoam balls, or CPK models along with Velcro adhesive patches. Molecular models of water and other substances can be made to give polarized molecular models. The polarization is reflected in patches of Velcro that are placed in structurally appropriate positions on the models in proportion to the partial charge on the atoms in the molecules. When collections of various models are shaken gently in a container, the expected H-bonds are formed; upon vigorous shaking the H-bonds are broken. This can be repeated over and over. The use of a blower system to directly visualize the dynamic formation of homonuclear as well as heteronuclear H-bonds with Styrofoam models is described.

Keywords (Audience):

High School / Introductory Chemistry

Keywords (Domain):

Demonstrations

Keywords (Subject):

Molecular Properties / Structure

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This article has been cited by 1 ACS Journal articles (1 most recent appear below).

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- An Updated Equilibrium Machine
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  Journal of Chemical Education2008 85 (8), 1131
  A device that can demonstrate equilibrium, kinetic, and thermodynamic concepts is described. The device consists of a leaf blower attached to a plastic container divided into two chambers by a barrier of variable size and form. Styrofoam balls can be ...
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