Transcript - NSTA Learning Center

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
Agenda:
1. Introductions
2. Tech and help info
3. Web Seminar training
4. Presentation
5. Evaluation
6. Chat with the presenters
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
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Al Byers
Assistant Exec. Director
NSTA
http://nsdl.org
Flavio Mendez
Program Manager
NSTA
Tech Assistance
Jeff Layman
Tech Support
703-312-9384
[email protected]
NSTA
Susan
Hurstcalderone
Science Teacher
Volunteer Chat
Moderator
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
Screenshot
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:
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Audio window:
Talk button, microphone and speaker
volume level
Where are you now?
http://nsdl.org
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
-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)
http://nsdl.org
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?
A.
B.
C.
D.
http://nsdl.org
Tongue
Touch
Sight
Smell
The nose can distinguish
10,000 different scents
1% of our genes code for smell
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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
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The mouth tastes only 5 things
-Sweet
-Salty
-Sour
-Bitter
-Umami
http://nsdl.org
Example structures
Sucrose
(sweet)
(S)-Glutamic Acid
(umami)
Ascorbic Acid
(sour)
Strychnine
(bitter)
Wouldn’t it be nice to
see all sides of a
molecule at once?
Sodium Chloride
(salty)
http://www.chemeddl.org/Quinine.html
http://nsdl.org
Which is bitter?
Caffeine
http://nsdl.org
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.
Sucrose
http://nsdl.org
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.ed
u/vicb/Articles/LensSum
mer2005/WhereAreTheN
ewDrugs.htm
Work by Rod MacKinnon
Taken from:
http://www.nsls.bnl.gov/newsroom/science/2006/01MacKinnon.htm
http://www.jce.divched.org/JCEDLib
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
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B
Activity: making mock
applesauce
Need:
– Cup
– Crackers
– Water
– Sugar
– Cream of tartar
(or lemon juice)
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Are you planning to do
the activity along with us?
A.Yes
B.No
C.Maybe
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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?
•
•
•
•
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Sweet (sugar)
Sour (cream of tartar)
Juicy (water)
Texture (crackers)
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!
Which one (or two) do you think
was made with real apples?
1
3
2
4
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?
http://nsdl.org
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!
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 QBank—Test Questions
JCE WebWare
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.org
http://www.jce.divched.org/JCEDLib
Dr. John Moore
[email protected]
Dr. Lynn Diener
[email protected]
Dr. Jon Holmes
[email protected]
THANK
YOU!
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
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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