LIVE INTERACTIVE LEARNING @ YOUR DESKTOP

LIVE INTERACTIVE LEARNING @ YOUR DESKTOP NSDL/NSTA Web Seminar: Chemistry Comes Alive! Thursday, March 8, 2007 6:30 p.m. to 8:00 p.m. Eastern time

http://nsdl.org Agenda: • Introductions • Tech and help info • Web Seminar training • Presentation • Evaluation • Chat with the presenters

http://nsdl.org How many web seminars have you attended? • 1-3 • 4-5 • More than 5 • This is my first web seminar. • I don’t know what is a web seminar. Use the letters A-E located at the top left of your actual screen to answer the poll

http://nsdl.org Al ByersAssistant Exec. DirectorNSTA Flavio MendezProgram ManagerNSTA

http://nsdl.org Tech Assistance Jeff LaymanTech Support703-312-9384jlayman@nsta.org NSTA Susan HurstcalderoneScience Teacher Volunteer Chat Moderator

http://nsdl.org What grade level do you teach? • Elementary School, K-5. • Middle School, 6-8. • High School, 9-12. • I teach college students, 13-16. • I am an Informal Educator.

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Pull down menus: View: Window Layouts, Lock Windows Tools: Audio, Edit Profile Top buttons: Your current layout, Polling tools Participants’ window: Names of participants, Tools’ icons, Raise hands, Emoticons, Step away door Direct Messaging window: Show, Send Audio window: Talk button, microphone and speaker volume level

http://nsdl.org Where are you now?

LIVE INTERACTIVE LEARNING @ YOUR DESKTOP NSDL/NSTA Web Seminar: Chemistry Comes Alive! Thursday, March 8, 2007 7:00 p.m. to 8:00 p.m. Eastern time

http://nsdl.org http://nsdl.org -NSDL Pathways for specific content -Newest Pathway: Chemistry -Rich variety of materials found in one place http://www.jce.divched.org/JCEDLib

http://nsdl.org Our Presenters Dr. Lynn Diener Dr. John Moore Journal of Chemical Education (JCE)

Today we will explore the chemistry of taste and odor using selected JCE resources Classroom Activity Featured Molecules Video http://nsdl.org

To taste, which is most important? Tongue Touch Sight Smell http://nsdl.org

The nose can distinguish 10,000 different scents 1% of our genes code for smell http://nsdl.org

Many chemicals we smell when we eat or sniff a flower are like this one: http://nsdl.org What is this chemical called? A. Ketone D. Ether B. Ester E. Alkene C. Carboxylic acid

The mouth tastes only 5 things -Sweet -Salty -Sour -Bitter -Umami http://nsdl.org

Example structures (S)-Glutamic Acid (umami) Sucrose (sweet) Ascorbic Acid (sour) Wouldn’t it be nice to see all sides of a molecule at once? Strychnine (bitter) Sodium Chloride (salty)

http://nsdl.org http://www.chemeddl.org/Quinine.html

Which is bitter? http://nsdl.org Caffeine Maltose

You can do this in your classroom Using JCE DLib you can find two different molecules and ask students to point out similarities, or differences. Molecules can be rotated to show similar views of each. Space filling or ball-and-stick can be shown. http://nsdl.org Sucrose Maltose

Cells in the mouth have different taste receptors G-protein-coupled receptors Sweet Bitter Umami • Ion channels • Salty • Sour lllustration by William Oldham Taken from: http://www.vanderbilt.edu/vicb/Articles/LensSummer2005/WhereAreTheNewDrugs.htm Work by Rod MacKinnon Taken from: http://www.nsls.bnl.gov/newsroom/science/2006/01-MacKinnon.htm

http://www.jce.divched.org/JCEDLib

http://nsdl.org Fooling the tongue is easy… because there are only 5 tastes to mimic • Sweet • Sour • Bitter • Salty • Umami • A JCE Classroom Activity shows how.

http://nsdl.org Which is really applesauce? A B

http://nsdl.org Activity: making mock applesauce Need: • Cup • Crackers • Water • Sugar • Cream of tartar (or lemon juice)

http://nsdl.org Are you planning to do the activity along with us? • Yes • No • Maybe

http://nsdl.org Try this • Crumble 1 or 2 crackers into a dish • Add 2 tsp water • Add 1 tsp sugar • Add 1/8 tsp cream of tartar (or lemon juice) • Stir and taste

http://nsdl.org How do these ingredients simulate applesauce? • Sweet (sugar) • Sour (cream of tartar) • Juicy (water) • Texture (crackers)

http://nsdl.org Safety Matters • All JCE classroom activities include safety considerations. • For this activity make sure not to use lab equipment or perform the activity in a lab!

Variations • Lemon juice or citric acid instead of cream of tartar • Try adding cinnamon or nutmeg • Use different crackers, saltine vs butter crackers • Add vanilla flavoring

Extension: Bake a mock apple pie and a real apple pie • Use the best filling recipe from the students • Have a taste test, see who can tell the difference. • Frozen pie crust works great!

http://nsdl.org Which one (or two) do you think was made with real apples?

http://nsdl.org Mmm, tastes like cherry! Artificial flavoring is big business.

http://nsdl.org Artificial flavoring • Cheaper • Purer and safer • Often tastes just as good • Active flavor is often chemically identical to the natural flavor Vanillin: artificial vanilla flavoring, taken from JCE DLib

http://nsdl.org Which product uses artificial flavor?

Another activity to try in class Have your students make cola using these ingredients: -sugar -vanilla extract -cinnamon -lime juice -club soda If you search for taste on the JCE index you will find more classroom activities and useful articles!

is starting with resources from the JCE DLib, building on resources from the ACS Education Division and ChemCollective project, and will grow from there. Chemical Education Digital Library (ChemEd DL)…

JCE QBank—Test Questions

JCE WebWare

http://nsdl.org JCE DLib Everything we used today can be found on the JCE DLib Please come and visit (after filling out the survey) Here is what to look for:

http://nsdl.org Go to http://nsdl.org and click on the K-12 audience page • Download this seminar’s companion guide with resources from the seminar and more! • Expert Voices blog with our presenters: http://expertvoices.nsdl.org

http://nsdl.org http://www.jce.divched.org/JCEDLib Dr. John Moore jwmoore@chem.wisc.edu THANK YOU! Dr. Lynn Diener lmdiener@wisc.edu Dr. Jon Holmes jlholmes@chem.wisc.edu

National Science Teachers Association Gerry Wheeler, Executive Director Frank Owens, Associate Executive Director Conferences and Programs Al Byers, Assistant Executive Director e-Learning NSTA Web Seminars Flavio Mendez, Program Manager Jeff Layman, Technical Coordinator Susan Hurstcalderone, Volunteer Chat Moderator LIVE INTERACTIVE LEARNING @ YOUR DESKTOP

JPL/NSTA: Using Earth to Explore Mars • March 14, 2007 • NSTA: Absolute Zero: The Cold Hard Facts About the Coolest Stuff in Physics • March 22, 2007 • 6:30 PM Eastern Time

NSTA SciGuides: Provide tools to quickly and easily locate targeted science content information and teaching resources from NSTA-reviewed science web sites. http://sciguides.nsta.org

Web Seminar Evaluation http://institute.nsta.org/survey/nsdlsurvey8.asp

LIVE INTERACTIVE LEARNING @ YOUR DESKTOP