LIVE INTERACTIVE LEARNING @ YOUR DESKTOP
Thursday, March 8, 2007
6:30 p.m. to 8:00 p.m. Eastern time
NSDL/NSTA Web Seminar:
Chemistry Comes Alive!
1. Introductions
2. Tech and help info
3. Web Seminar training
4. Presentation
5. Evaluation
6. Chat with the presenters
Agenda:
http://nsdl.org
How many web seminars have you attended?
A. 1-3
B. 4-5
C. More than 5
D. This is my first web seminar.
E. 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
Jeff LaymanTech Support703-312-9384
[email protected] NSTA
Susan HurstcalderoneScience TeacherVolunteer Chat
Moderator
Tech Assistance
http://nsdl.org
What grade level do you teach?
(a) Elementary School, K-5.
(b) Middle School, 6-8.
(c) High School, 9-12.
(d) I teach college students, 13-16.
(e) I am an Informal Educator.
http://nsdl.org
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LIVE INTERACTIVE LEARNING @ YOUR DESKTOP
Thursday, March 8, 2007
7:00 p.m. to 8:00 p.m. Eastern time
NSDL/NSTA Web Seminar:
Chemistry Comes Alive!
http://nsdl.orghttp://nsdl.org
-NSDL Pathways for specific content
-Newest Pathway: Chemistry
-Rich variety of materials found in one place
http://nsdl.org
http://www.jce.divched.org/JCEDLib
Today we will explore the chemistry of taste and odor using
selected JCE resources
• Classroom Activity• Featured Molecules• Video
http://nsdl.org
Many chemicals we smell when we eat or sniff a flower are like this one:
What is this chemical called?
A. Ketone D. Ether
B. Ester E. Alkene
C. Carboxylic acid
http://nsdl.org
Example structures
Sucrose(sweet)
Strychnine(bitter)
(S)-Glutamic Acid(umami)
Sodium Chloride(salty)
Ascorbic Acid(sour)
Wouldn’t it be nice to see all sides of a
molecule at once?
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.
Sucrose Maltose
http://nsdl.org
Cells in the mouth have different taste receptors
G-protein-coupledreceptors• 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
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
Activity: making mock applesauce
Need:
– Cup
– Crackers
– Water
– Sugar
– Cream of tartar (or lemon juice)
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!
http://nsdl.org
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!
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
Another activity to try in class
-sugar -vanilla extract -cinnamon -lime juice -club soda
Have your students make cola using these ingredients:
If you search for taste on the JCE index you will find more classroom activities and useful articles!
Chemical Education Digital Library
(ChemEd DL)…
is starting with resources from the JCE DLib, building on resources from the ACS Education Division and ChemCollective project, and will grow from there.
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://nsdl.orghttp://nsdl.org
THANK YOU!
http://www.jce.divched.org/JCEDLib
Dr. John [email protected]
Dr. Lynn [email protected]
Dr. Jon [email protected]
National Science Teachers AssociationGerry Wheeler, Executive Director
Frank Owens, Associate Executive Director Conferences and Programs
Al Byers, Assistant Executive Director e-Learning
LIVE INTERACTIVE LEARNING @ YOUR DESKTOP
NSTA Web SeminarsFlavio Mendez, Program Manager
Jeff Layman, Technical CoordinatorSusan Hurstcalderone, Volunteer Chat Moderator
• 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
http://sciguides.nsta.org
NSTA SciGuides:
Provide tools to quickly and easily locate targeted science
content information and teaching resources from NSTA-reviewed
science web sites.