Sunday, November 9, 2008

Weekly review

Well last week we got all of our math and Grammar finished that was planned. We did some science, not as many lessons as I had wanted. And of course History took a back seat again. We didn't have our Earth Scouts meeting, most of the families were going to miss it, so I didn't want to run the families that live further away out, especially since we just were going to do some reading.

But we did have a great day at co-op on Friday. The boys (my heathen son included) in Wizardology were EXTREMELY hyper this week. But we got through that with no bloodshed. hehe During my break (2nd class session, I don't teach) I got to hang out with Mr. Lincoln. He is a 10 month old on the verge of walking and an extremely busy guy. He kept me on my toes for an hour. :)

Then after lunch, it was Kitchen Chemistry. Again, some of the kids tend to be very hyper and very impatient. This can be nerve wracking when 16-18 kids are yelling at you at once. But we got into the activity, making Lava Lamps!! I think Amanda has some pictures, so I need to get those form her. Here are directions for the Lava Lamps. I highly recommend this, it was a lot of fun. Just be sure the kids DO NOT SHAKE the bottle once the food coloring is in. :)

- One clean, plastic soda bottle (16 oz. size works well)
- Soda bottle cap
- Vegetable oil (the cheaper the better)
- Food coloring
- An Alka-Seltzer tablet
- Water

* Fill the bottle 3/4 full with vegetable oil.
* Fill the rest of the bottle with water (almost to the top but not overflowing).
* Add about 10 drops of food coloring. Be sure to make the water fairly dark in color. Notice that the food coloring only colors the water and not the oil. Hmmm?
* Divide the Alka-Seltzer tablet into 8 pieces.
* Drop one of the tiny pieces of Alka-Seltzer into the oil and water mixture. Watch what happens. When the bubbling stops, add another chunk of Alka-Seltzer. It’s just like a lava lamp!
* When you have used up all of the Alka-Seltzer and the bubbling has completely stopped, screw on the soda bottle cap. Tip the bottle back and forth and watch the wave appear. The tiny droplets of liquid join together to make one big lava-like blob.

How does it work?
First of all, you confirmed what you already knew... oil and water do not mix. The molecules of water do not like to mix with the molecules of oil. Even if you try to really shake-up the bottle, the oil breaks up into small little drops, but the oil doesn’t mix with the water. Food coloring only mixes with water. That’s why it does not color the oil.

When you poured the water into the soda bottle with the oil, the water sank to the bottom. That’s because water is heavier than oil. Scientists say that the water is more dense than the oil. If oil from a ship spills in the ocean, the oil floats on top of the water.

Here’s the surprising part... The Alka-Seltzer tablet reacted with the water to make tiny bubbles of carbon dioxide gas. These bubbles attached themselves to the blobs of colored water and cause them to float to the surface. When the bubbles popped, the color blobs sank back to the bottom of the bottle. Now that’s a burst of color!

And last but not least, check out the fun video Amanda made of her and some of the kids dancing to Chumbawumba's Tubthumping. Great song to be blaring in a church gym. hehe

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