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molding molecules - posted from Sonoma, CA
We didn't have marshmallows or strong noodles so we used Play-Doh and toothpicks. It works great but partly flimsy, I should have saw it coming. The marshmallows might work better, but if you don't have them I recommend play-doh and toothpicks not shop run for a experiment that takes less than ten minutes.
Activity 2 Video - posted from Tega Cay, SC
We were missing a balloon for the Activity 2 Experiment, so watched this video of the same experiment.
Endothermic and exothermic reactions - posted from Louisville, KY
A perfect engineering project to complete this unit - posted from North Salem, NY
I have been using the free lessons at middleschoolchemistry.com to supplement several of these lessons. Lesson 6.11, Chemical reactions and engineering design, is perfect for a final project for this unit, especially if you are using The View from Saturday as well. It walks students through designing a way to move reptile eggs and keep them warm (using an exothermic reaction) as they are being transported to an incubator. All you need is calcium chloride.
Follow the link below, click on lesson plans, and look for chapter 6, lesson 11
Periodic Table of Elements - posted from Durham, NC
- link: http://www.ptable.com/
Endothermic Reaction - posted from Stoneham, MA
The experiment sheet Exothermic Reaction / Endothermic Reaction did not work the first time for us, because:
- the citric acid sold in stores here, as a canning supply, is in solid form not solution
- the amount of baking soda to use is not stated
What we did was use 25 ml of baking soda, and then added an 1/8th cup of room-temperature water to start the reaction. This worked well, dropping the temperature to below freezing.
A Book About the Elements - posted from El Dorado Hills, CA
The DK book titled "It's Elementary" by Robert Winston presents the elements in a way that a child can discover what things are made of, what the elements are, and the roles they play in our lives. It's very colorful, contains loads of information, and has a periodic table of elements that would be engaging to a child. The table was handy for me too since I had difficulty reading the one contained in the student activity booklet.
Modeling Molecules - posted from El Dorado Hills, CA
Marshmallows work just fine for modeling molecules, but I learned, after making a trip to the store to purchase marshmallows, that we could have used modeling clay or play-dough. In an example I saw in a science book, they used small dowels or toothpicks, but I suppose it's worth a try using a thicker uncooked pasta noodle.