Text-only / Accessible Version Skip Navigation itchy MOLO

Jump to Activity:   

Search the Database:  

A Concord Consortium Project
HomeDatabaseSoftwareHelpResearchAuthoring

Home >> Database >> Activities >> View

In the Database section: Introduction | Search | Browse



Activity Number
235
Editable
Overview and Learning Objectives
Classroom Practice
Central Concepts
Textbook References
Benchmarks and Standards
Extensions and Connections
Macro Micro Link
Activity Credits
Requirements

Strong Chemical Bonds (SAM) (a 2-day, 10-page activity)

Interactive, scaffolded model

Activity Screenshot

Go To Activity


Follow the link above to start or download this activity.

This Activity Requires:

  • Adobe Flash Plugin
  • Java 1.5+ - Java 1.5+ is available for Windows, Linux, and Mac OS X 10.4 and greater. If you are using Mac OS X 10.3, you can download MW Version 1.3 and explore within it instead.
  • QuickTime for Java - Important Note: Due to a recent QuickTime update, you may not be able to see some models with embedded Flash components. We are currently trying to develop a workaround.

      Test your system to see if it meets the requirements

Important! If you cannot launch anything from this database, please follow the step-by-step instructions on the software page.

Please Note: Many models are linked to directly from within the database. When an activity employs our scripting language, Pedagogica, as do some of the "guided" activities, the initial download may take several minutes. Subsequent activities will not take a long time. See this page for further instructions.

Overview and Learning Objectives

First, students experiment with how orbital shapes are affected by other charges and atoms. Then, students explore the role of electronegativity in bond formation by setting the electronegativities of two bonded atoms. They should see that ionic bonds form between atoms of very disparate electronegativities, and that polar covalent bonds form between atoms of somewhat disparate electronegativities, and non-polar covalent bonds form between atoms that have similar electronegativities. Finally, they will also see how a molecular surface becomes polarized when polar covalent bonds are part of a larger molecule.

Students will be able to:

  • experiment with setting the electronegativity of two different atoms;
  • explain the relationship between types of bonds and the electronegativity of the bonded atoms;
  • explain why polar bonds form and their relationship to electron clouds as they are attracted to two different nuclei.

return to top

Classroom Practice

The intention of this activity is that it would be run over two separate class days, so that the students would complete Part 1, then have a class discussion, perhaps revisiting some of the key models together via an LCD projector or smart board, and then complete Part 2 the next day. Having students complete the entire computer based activity in one sitting is not recommended.

Prerequisite: Because students explore the formation of chemical bonds using atoms that depict electrons in orbitals instead of orbits, it would be helpful if they had some understanding of basic atomic structure and concept of a simple orbital. There are also several representations of molecules in this activity, so understanding that molecules can be visualized in various ways, yet still be the same molecule, will also be a benefit.

The last part of the activity connects the idea of polarity to the properties of various amino acids. While not necessary, if the students were already familiar with the idea that a protein is linked chain of amino acids, it would be beneficial.

return to top

Central Concepts

Key Concept:

The type of bond formed -- ionic, non-polar covalent, or polar covalent -- depends on the electronegativity of the two atoms that are bonded together.

Additional Related Concepts

Concept Map Available

Molecular Biology

  • Polar molecules
  • Polar nature of water

Physics/Chemistry

  • Bonds
  • Covalent bonds
  • Dipole
  • Electron
  • Electronegativity
  • Ionic bonds
  • Molecule
  • van der Waals

return to top

Textbook References

  • Biology (Prentice-Hall) New York Edition - Chapter Eight: Photosynthesis
  • Biology (Prentice-Hall) New York Edition - Chapter Two - The Chemistry of Life
  • Biology: Concepts and Connections (Pearson) 5th Edition - Chapter 2: The Chemical Basis of Life
  • BSCS Blue (8th Edition) - Chapter 1: The Chemistry of Life
  • Cell Biology (Pollard and Earnshaw) Saunders 2002 - Chapter Three: Basic Biophysical Concepts

return to top

Benchmarks and Standards

AAAS

  • THE PHYSICAL SETTING: THE STRUCTURE OF MATTER - Atoms often join with one another in various combinations in distinct molecules or in repeating three-dimensional crystal patterns (Full Text of Standard)

  • THE PHYSICAL SETTING: THE STRUCTURE OF MATTER - The configuration of atoms in a molecule determines the molecule's properties (Full Text of Standard)

NSES

  • Physical-Science: Matter Structure/Properties - 1 Atoms interact with one another by transferring or sharing electrons (Full Text of Standard)

  • Physical-Science: Matter Structure/Properties - 3 Bonds between atoms are created when electrons are paired up (Full Text of Standard)

return to top

Extensions and Connections

Fermi Lab's ARISE project recommends the following as extensions to this SAM activity:

http://www.concord.org/~btinker/SAM/ARISE/ARISE_SAM_chemical_bonds.pdf

return to top

Macro Micro Link

By understanding the different types of bonds that can form, many physical properties can be understood, including boiling point and solubility.

return to top

Activity Credits

Created by CC Project: Molecular Logic using Molecular Workbench

return to top

Requirements

  • Adobe Flash Plugin
  • Java 1.5+ - Java 1.5+ is available for Windows, Linux, and Mac OS X 10.4 and greater. If you are using Mac OS X 10.3, you can download MW Version 1.3 and explore within it instead.
  • QuickTime for Java - Important Note: Due to a recent QuickTime update, you may not be able to see some models with embedded Flash components. We are currently trying to develop a workaround.

return to top



Last Update: 11/25/2008 Maintainer: CC Web Team (webmaster@concord.org)
Document Options: Text-only / Accessible Version | Printable Version | E-mail this Page

Copyright © 2014, The Concord Consortium.
All rights reserved.

NSF Logo
These materials are based upon work supported
by the National Science Foundation under grant numbers
9980620, ESI-0242701 and EIA-0219345

Any opinions, findings, and conclusions or recommendations expressed in this
material are those of the author(s) and do not necessarily reflect
the views of the National Science Foundation.