Do Now – 10/8/09 On your Do Now Sheets: in complete sentences 1.Have you ever ate way too much at a meal before? 2.What did you eat, how much, in how much time? 3.How did you feel? Did your stomach explode? Do you think its possible

Lab Notebooks 1.Make sure your table of contents is accurate and up to date 2.Listen to the News story on the woman whose stomach exploded. 3.Answer the response questions on Page 6, in your lab notebooks (15 pts)

Listen to article, answer the following on pg 6 of lab notebook Are tabloids a source of information we can trust? Do you believe that a stomach truly can explode as explained in the article? What in your past experiences gives this story even a hint of believability?

Tomorrow: “Can a stomach explode from eating too much and then consuming baking soda?” Why? – So we can have a clearer idea of what a chemical change and a physical change is? – Practice observation and inference skills

Mythbusters Clip: Can a stomach really explode? Watch the clip and answer the following on pg 6 of your lab notebook Before the video: 1.Do you think a stomach can explode from combing mentos and soda? y/n explain (1-2 sent.) After the video: 2.Was it possible? Why/why not? 3.Summerize how they setup there experiment. 4.What was the variable they were testing?

Design your experiment (4 minutes) On pg. 6 of your lab notebook, write down and explain how you will run your experiment? – State your question and hypothesis. – What materials will you need? – What will your procedure be? – How will you replicate the digestive process?

Get somebody to eat a bunch of food and baking soda Ethical problems. Safety issues Others as generated by the class

Use an animal stomach to recreate the event Low availability and disposal problems Ethical/religious

Use a 2 liter bottle Difficulty in inserting food and baking soda quickly Use of funnel always jams with food Others as generated by the class

Use a Ziploc bag to simulate a stomach Plastic is not very similar to a stomach’s material Closing the bag is slower than a stomach can seal itself No mechanism to release gas like a real person does Others as generated by the class

Safety We will be using HCL (Hydrochloric Acid), the same acid in your stomach that digests food – It will be diluted, however... – APRONS AND GOGGLES MUST BE WORN AT ALL TIMES!! – IF IT SPILLS ON YOUR HANDS, WASH IT OFF Imediatly AND THEN LET ME KNOW!!

Copy down this procedure Put 20 mL of 3 M HCl into a Ziploc bag. Add slice of bread Add 40 g of baking soda quickly seal the bag Flip the bag occasionally to simulate a churning stomach.

Extra Time: the following are due tomorrow Complete the three worksheets from this week HW is posted on the wall and online