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ACS/NSTA Web Seminars:

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Chemical Bonding: Why is Water Different?
All web seminar participants use online tools that allow them to mark-up presenter's slides or share desktop applications in addition to engaging in chat with others online and answering poll questions

This Web Seminar took place on November 16, 2011 from 6:30 p.m. to 8:00 p.m. Eastern Time. Presenting was Jerry A. Bell, retired member of the Education Division of the American Chemical Society (ACS), and Bonnie Bloom, chemistry teacher at Hilliard Davidson High School in Ohio. In this Seminar, Mr. Bell and Ms. Bloom talked about why water is more dense as a solid than as a liquid—a trait that sets it apart from other familiar substances.

The PowerPoint, related resources from the NSTA Learning Center, and web links from the presentation are now contained in the above resource collection. Clicking on the collection link will place it in your Learning Center, My Library, neatly organized under the My Resource Collections tab.


This was the fifth of five Web Seminars scheduled this fall in cooperation with the American Chemical Society. In this program, Mr. Bell and Ms. Bloom used interactive questions, models, and a video to explain why ice floats on water. They demonstrated the role of hydrogen bonding in the behavior of water molecules and contrasted the structure of water with the structure of ammonia. The presenters answered participant questions, including how to address common student challenges with this topic.


Eighty-six (86) participants were present at the live Web Seminar in addition to the presenter and NSTA staff. Participating educators represented the states of Arizona, California, Connecticut, District of Columbia, Florida, Georgia, Hawaii, Illinois, Indiana, Iowa, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Missouri, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, South Carolina, Tennessee, Texas, Virginia, Washington, and Wisconsin. One participant attended the Web Seminar from a country outside the United States: Israel.


Seminar participants received one of the NSTA SciGuides. A certificate of attendance was deposited into participants' My PD Record and Certificates area in the NSTA Learning Center for completing the evaluation form at the end of the program.


Here are some comments provided by the participants at the end of the Web Seminar:

  • “I teach how ice is different and being able to show the hydrogen bonds will greatly help my students visualize.”
  • “Water is an important topic when teaching weather! I attended this webinar to see if I could learn more about the chemistry of water. I did!”
  • “The logic sequence was terrific! Questions were guiding the thought process, which is excellent modeling of teaching!”
  • “I loved it. I had never really thought about how the number of hydrogen bonds water could form made such a huge difference in its properties.”

Thanks to the participants and the presenter for the learning opportunity, the interactions, and a job well done!


See when other American Chemical Society (ACS) Web Seminars are scheduled




For more information contact webseminars@nsta.org


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Underwritten by American Chemical Society