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harritaco favorited a video
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harritaco favorited a video
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harritaco liked a video
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Zakk Wylde popped into the Jamtrackcentral studio in 2005 and jammed ove...
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Zakk Wylde popped into the Jamtrackcentral studio in 2005 and jammed over this backing track especially written for him by our very own JAN CYRKA, which was originally commissioned by Guitarist Magazine in the UK. Check out all our free downloads at: http://www.jamtra...
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harritaco liked a video
(2 days ago)
We show how to make glow sticks and go through all the chemicals needed ...
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We show how to make glow sticks and go through all the chemicals needed as well as how to make different colors. We also talk about the chemistry and scientifically research a proposed mechanism.
To make the glow stick mix together the following:
10mL Diethyl Phthalate (solvent)
3mg of fluorescent dye (see below)
50mg TCPO (see below)
100mg sodium acetate
3mL 30% hydrogen peroxide (add last to start reaction)
The fluorescent dye can be 9,10-bis(phenylethynyl)anthracene for green, Rubrene for yellow, 9,10-diphenylanthracene for blue, and rhodamine B for red.
TCPO is expensive to buy but can be made for much cheaper by following the directions in our previous video: http://www.youtub...
The chemicals, including the ones to make TCPO were purchased from alfa aesar: http://www.alfa.com
The Rhodamine B and Rubrene dyes were instead purchased from sigma Aldrich: http://www.sigmaa...
The dyes and TCPO are carcinogenic and gloves should be worn when handling them.
The TCPO and sodium acetate amounts can be varied considerably and still obtain good light. Smaller quantities tend to be dimmer and decay faster, while larger quantities last longer.
For those of you higher level individuals that actually do want to know the mechanism for this process, please refer to this article: http://pubs.acs.o...
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harritaco liked a video
(2 days ago)
In this video we turn copper pennies into silver and finally to gold.
Ob...
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In this video we turn copper pennies into silver and finally to gold.
Obviously it's a chemistry trick but still impressive.
First we get 30g of zinc sulfate and dissolve it into 100mL of water.
Zinc sulfate was made back in our video on making a copper sulfate and
zinc battery: http://www.youtub...
If you don't have zinc sulfate or can't make it, you can also use zinc chloride. This can be made by simply mixing hydrochloric acid with zinc metal and waiting until the fizzing stops.
Then we drop in several cut strips of zinc metal.
Zinc metal was obtained from our video on getting useful materials from batteries: http://www.youtub...
The solution is heated to a boil and copper pennies, that have been thoroughly washed/cleaned, are dropped in. They must touch the zinc in order for this reaction to work. Leave it in for five to ten minutes.
The zinc metal dissolves and releases electrons that go into the copper and give it a negative charge. The zinc ions in solution now redeposit form a thin layer of zinc metal. Giving the coin a silvery color.
Now the smart physical chemist might wonder how this can possibly work. Overall we're going from zinc metal to zinc metal and at first it seems like we're missing something about thermodynamics. What is the driving force? I've searched the literature and there doesn't seem to be a consensus among scientists, some claim it's a surface free energy issue with zinc having a lower potential on copper than in free solution (at high concentration). Others state that its an alloy of zinc metal and copper on the surface. The silvery color you're seeing on the penny is actually a type of white brass, not pure zinc. This is thermodynamically more favorable than pure separate metals and thus serves as the driving force.
Anyway, whatever the specific chemical reason, we've now deposited zinc onto copper.
The most amazing trick is to turn it into gold. Simply wash the coin and place it on a hotplate heated to about 300 Celsius. As it heats the zinc will diffuse into the copper, forming brass on the surface that looks like gold.
Eventually it will wear off but the results are rather impressive.
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bahah, just kidding.
love you, kid. : )
Thanks for fixing my account!! :))