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

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Al Byers Assistant Exec. Director

NSTA

Flavio Mendez Program Manager

NSTA

http://nsdl.org

Jeff LaymanTech Support703-312-9384

jlayman@nsta.org NSTA

Susan HurstcalderoneScience TeacherVolunteer Chat

Moderator

Tech Assistance

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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:

Show, Send

Audio window:

Talk button, microphone and speaker volume level

Where are you now?

http://nsdl.org

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

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

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To taste, which is most important?

A. Tongue

B. Touch

C. Sight

D. Smell

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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

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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?

http://nsdl.org

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

Which is bitter?

Caffeine Maltose

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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

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.

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Which is really applesauce?

A B

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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

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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!

Which one (or two) do you think was made with real apples?

1 3

2 4

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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

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Which product uses artificial flavor?

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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 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.orghttp://nsdl.org

THANK YOU!

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

Dr. John Moorejwmoore@chem.wisc.edu

Dr. Lynn Dienerlmdiener@wisc.edu

Dr. Jon Holmesjlholmes@chem.wisc.edu

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.

Web Seminar Evaluation

http://institute.nsta.org/survey/nsdlsurvey8.asp