[Channel-talkchemistry] Reaction in chemistry workshop #5 post 2

The stoichiometry cooking exploration lab has merit. As the unit on stoichiometry proceeds the teacher and student will have some lab experience to relate back to. Making predictions prior to baking and explaining the results after the lab is completed is useful. Then eating the products will always peak a students interest. My students complete an ice cream, peanut brittle and M&M activity where they eat the products. These are the activities they remember the most. Through out this activity Ms. Morine moves from group to group asking questions, describing the various chemical reactions and relating the results to proper stoichiometry properties. During the baking time would be an excellent opportunity to start the quantitative discussion of chemical reactions and stoichiometry. I have not started stoichiometry unit yet but I am going to use this activity. My plan is to use last 20 minutes of one class to mix the ingredients and put in the a pan. Then take them down to the home ec. room to bake at the beginning of the next class. While they are baking I can start the stoich. unit. A couple of you have talked about using the distillation activity while discussing mixture. That is an early topic for me so I have missed the opportunity this year with my first year chemistry students. My AP chemistry students complete a fermentation activity. A Cargill corn milling plant is located south of us and they produce ethanol. We use there process and materials then use their HPLC to analyze our products. Flinn Scientific has a Grape Soda Column Chromatography activity that I use with those students to discuss what happens with the HPLC's. Some of the safety issues with the soda distillation activity is the use of lime water. It was important to show what happens when CO2 reacts with Ca(OH)2. Just have to make sure the teacher breaths in prior to putting there mouth on the straw. Using hot plate instead of Bunsen burners is safer. Concerns with the soda bubbling over, the cork popping out or steam from the tubing be directed towards another student are issues that both the teacher and student need to be aware of. The way I deal with safety in my class room is in all labs students wear goggles and aprons. Long hair is tied backed and sleeves are pulled up. We have a safety shower, eye wash stations, fire extinguishers and safety blankets in all science class rooms. During each pre-lab discussion safety is addressed and with my AP chem students they have a prelab quiz that includes safety questions.

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Received on Fri Nov 5 10:25:30 2004