Re: pinhole Back to Explosive Bubbles

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From: Geoff Ruth (gruth@leadershiphigh.org)
Date: Tue Nov 09 2004 - 11:06:38 PST 

Message-Id: <p06110428bdb6c4a39da1@[10.100.1.253]>
Date: Tue, 9 Nov 2004 11:06:38 -0800
From: Geoff Ruth <gruth@leadershiphigh.org>
Subject: Re: pinhole Back to Explosive Bubbles

The cheapest/easiest way I've found to make oxygen gas is add a
spatula-full of yeast (baker's yeast) to 3% hydrogen peroxide (the
stuff you buy in the drug store)?

For hydrogen, the way that I make it is by adding 1 M HCl to excess
mossy zinc. Does anyone have a cheaper way of making H2 gas?

Cheers,
Geoff Ruth

>I think I just need to ask this question more clearly.
>
>What is the cheapest/easiest chemical reaction that
>will produce Hydrogen?
>
>What is the cheapest/easiest chemical reaction that
>will produce Oxygen?
>
>1. This reaction in a flask with a blow-off tube will
>produce soap bubbles of the reaction gas in a tray.
>
>2. Bubbles of both types of gases will intermix in
>the tray.
>
>3. A volunteer is chosen from the crowd.
>
>4. Demonstrator and volunteer put in EARPLUGS.
>
>5. Demonstrator has volunteer scoop up a handful of
>bubbles and extend hands outward.
>
>6. Demonstrator ignites bubbles, producing a very loud
>BANG. No harm comes to Demonstrator or Volunteer.
>
>I have done this DEMO with a bunch of teachers before.
> It is totally harmless and lots of fun! I just need
>to know about cheap and easy ways of isolating the
>gases so I do not bankrupt my science department.
>
>Hope this clears my question some,
>
>Scott Contini
>mr_contini@sci-con.com
>
>
>
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