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ACS/NSTA Web Seminars:

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Changes of State: Evaporation, Condensation, Freezing, and Melting - Introducing a Free Online Resource for Middle School Chemistry
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 July 26, 2012 from 6:30 p.m. to 8:00 p.m. Eastern Time. The presenter was James Kessler, Manager of K-8 Science Education at the American Chemical Society. In this Seminar, Mr. Kessler shared lessons and activities from the second chapter of middleschoolchemistry.com, a web-based resource that helps teachers engage middle school students with chemistry concepts.

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 second presentation in a series of six web seminars covering each of the six chapters in middleschoolchemistry.com. During the program, Mr. Kessler introduced participants to the website and explained the format of the activity-based lessons. He then delved into the big idea for Chapter 2: Changes of State: Evaporation, Condensation, Freezing, and Melting. Participants learned strategies for implementing the lessons by watching several videos and animations featuring demonstrations of each concept. Mr. Kessler also discussed the connection between the lessons and the National Framework for Science Education.


One hundred and twenty-seven (127) participants were present at the live Web Seminar in addition to the presenter and NSTA staff. Participating educators represented the states of Alabama, Arizona, Arkansas, California, Colorado, Connecticut, Florida, Georgia, Hawaii, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maryland, Maryland, Massachusetts, Michigan, Minnesota, Nebraska, New Hampshire, New Jersey, New Mexico, New York, North Carolina, Oregon, Oregon, Pennsylvania, South Carolina, Tennessee, Texas, Virginia, Washington, West Virginia, and Wisconsin. In addition, four participants joined the program from locations outside the United States: Canada, Germany, Puerto Rico, and Turkey.


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:

  • “Having such organized, high quality resources in one web site is wonderful. The flow of concepts is also very helpful.”
  • “The content provided gave good examples and resources for use in the classroom. VERY VALUABLE!”
  • “The animation clips will be extremely helpful to show molecule movement when discussing states of matter.”
  • “Intact 5E lessons and variety of multimedia content make this very easy to implement!! Love it!”

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