Coke and Mentos?

[CBFryman 2]

http://video.google.com/videoplay?docid=56...nd+Mentos&hl=en

[Eldorado 0]

sweet

lame how they dont show you

[Tirefryr 1,742]

And it only works with Diet Coke.

[Eldorado 0]

and regular mentos

I think rock salt also helps

[Adrian_D 520]

there was a site set up by the guys that did the experiment. lots of movies and explanations. i'll try to fin the link again...

[Jmac 24]

I kept expecting it to blow up and kill one of them

[CBFryman 2]

I beleive it is the calcium carbonate (basically lime rock) in the mentos shell that reacts with the carbonic acid releaseing all of the C02 extremely quickly. How they sealed it up before the reaction started I have no idea.

It works with ALL sodas containging carbonic acid, people just use diet because it doesnt have surgar so there is less stickey mess. I'm going to try it with tums (basically just calcium carbonate).

The only way I think they could have done that is to have put some sort of buffer layre over the mentos or w/e they used. Time to raid the chemical room agian.

[Worlddre 1]

wow that should be some sort of science fair project

[CBFryman 2]

I kept expecting it to blow up and kill one of them

<{POST_SNAPBACK}>

Though unplesant, I had an HCl bomb blow up almost right after it left my hands. Loud and I sprinted to the nearest focet to wash the acid spray off of me, the plastic didnt hurt at all. Now that cap...that is another story.

[Adrian_D 520]

I beleive it is the calcium carbonate (basically lime rock) in the mentos shell that reacts with the carbonic acid releaseing all of the C02 extremely quickly. How they sealed it up before the reaction started I have no idea.

It works with ALL sodas containging carbonic acid, people just use diet because it doesnt have surgar so there is less stickey mess. I'm going to try it with tums (basically just calcium carbonate).

The only way I think they could have done that is to have put some sort of buffer layre over the mentos or w/e they used. Time to raid the chemical room agian.

it happens because of the surface of the mentos "pill". it don't know exactly how to describe the effect.

i was too busy learning for the driving school written exam.

they drilled a small hole in the bottle cap and pulled a string threough it. they also drilled a small hole through each mentos and pulled the string through. then the made a knot at the end, screwed the cap back on and let the string go.

[Adrian_D 520]

http://www.eepybird.com/dcm1.html#featured-video

there's all the info.

enjoy

[CBFryman 2]

Yeah, That is what I thought. The shell is largely calcium carbonate (CaC03). When it comes in contact with any actid it releases carbon dioxide and neutralizes the acid. When Calcium carbonate is neutralized it releases carbond dioxide. Lots of carbondioxide = lots of pressure.

Shwate.

[bobby_7 0]

so how do you do the rocket one?? put 4 mentos in there and shut the cap??

[IamDeMan 0]

I kept expecting it to blow up and kill one of them

<{POST_SNAPBACK}>

Mythbusters showed that Aspartme reacted with mentos as well adding to the effect. So DIET works better not just less sticky

[Adrian_D 520]

Yeah, That is what I thought. The shell is largely calcium carbonate (CaC03). When it comes in contact with any actid it releases carbon dioxide and neutralizes the acid. When Calcium carbonate is neutralized it releases carbond dioxide. Lots of carbondioxide = lots of pressure.

Shwate.

Making Lots of Bubbles

These chemists are saying that the primary cause is physical, not chemical.  Their explanation: nucleation sites. If you have a liquid that is supersaturated with gas (like soda, which is pumped full of carbon dioxide), a nucleation site is a place where the gas is able to form bubbles. Nucleation sites can be scratches on a surface or specks of dust – anywhere that you have a high surface area in a very small volume. That's where bubbles can form.

Mentos seem to be loaded with nucleation sites. In other words, there are so many microscopic nooks and crannies on the surface of a Mento that an incredible number of bubbles will form when you drop it in a bottle of soda.  Since the Mentos are also heavy enough to sink, they react with the soda all the way to the bottom. The escaping bubbles quickly turn into a raging foam, and the pressure builds dramatically. Before you know it, you've got a big geyser happening!

not quite what you were saying...

[CBFryman 2]

Porus also makes for more surface area.

What that doesnt mention is premative carbonic acid (not actualy carbonic acid, but the'carbonic acid' used in soda) is simly CO2 disolved in water, IE Soda Water.