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Old 02-05-2006, 01:23 PM
Rogue Rogue is offline
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Exclamation 9th grade student- Im in a hurry!!! Read this!!!! Cool Experiment

I need a cool project, a very cool one. Please!!! i need some ideas!!
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Old 02-05-2006, 05:14 PM
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Question Which do you want?

I just read your other two threads! FLP-you have three threads and you just really need one. Thank you!
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Old 03-30-2006, 03:20 PM
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Post This might help!!!!!!!!

How much oxygen is in air?

This is an experiment to measure how much oxygen is in the air. It's an easy one-evening experiment.
Get some of those hand-warmer pouches. They come sealed in plastic film, and inside are two cloth bags, one for each hand. They cost about $1 at hardware stores. (Trouble finding them?)

The pouches have charcoal and iron powder in them. The iron reacts with oxygen in the air to make rust. This uses up all the oxygen. It also makes heat to keep your hands warm. These things are oxygen-eaters! They come sealed in plastic so that after they use up the little bit of oxygen that's in the package with them, they stop reacting until you open the package. Here's what a company that makes them says about how they work.

Tape one of the pouches inside the bottom of a cylindrical drinking glass. Duct tape works well (doesn't it always?). Then put the glass upside down in a shallow plate of water.
If you don't have duct tape, you can use a pencil or something to keep the pouch from falling into the water.
As the hand-warmer uses up the oxygen in the air inside the glass, the water level rises up into the glass.
When all the oxygen is gone, the water stops rising. You can see how much the water level rose, as a fraction of the total amount of air originally in the glass. That's the fraction of the air that was oxygen.

It takes a few hours to finish using up the oxygen, but you can see the water rising after about 20 minutes. What percentage of our air is oxygen?

Here's the most popular question: How do I tell from the water level how much of the air was oxygen? Well, for instance, if the water rose 1/3 of the way up the glass, then 1/3 of the air in the glass was oxygen.

If you want you can also compare indoor air to outdoor air. If you do this, keep in mind that cold air will expand a bit as it warms up, and this can bias your results. So you need to start with both samples of air at room-tempertature air.
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Old 04-02-2006, 10:10 AM
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Default Oh what a brilliant science project

What a fantastic science project idea! Brainy, you've done it again!

I've got one question though - how do we know that the pouch had enough iron in it to "eat up" all the oxygen in the glass. Can we be sure that the water didn't stop rising because there wasn't enough iron left to reach with the oxygen (although there was some more oxygen left in the glass)?
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