why does a pop of soda burst out after shaking it?
93082
Both the previous answers are good except shaking the can does not increase the pressure within the can, which is a surprise to most people.  I read somewhere (and the link of one of the posters confirms) that the pressure within the can remains the same, which is actually above atmospheric pressure.  If you open a can without shaking it, a small volume of Carbon dioxide expands with a slight pop and a very small surface area of fluid is now exposed to the atmosphere at the top of the can.  Carbon dioxide is now free to enter and leave the fluid surface and since the fluid has a higher concentration of CO2, the net effect is loss from the fluid until at equilibrium with the atmosphere after which the soda is flat.\n\nShaking the container disperses CO2 bubbles (not air) throughout the fluid greatly increasing its effective surface area for separation and since the entire content is above atmospheric pressure the CO2 bubbles expand to atmospheric pressure and overflow the can.  The fizz in a glass of soda (or the opened can) represents the tiny bubbles of CO2 that form at nucleation points on the glass until large enough to rise and pop at the surface.  I'd imagine that adding soap which forms a better film would change the fizz to foam, but why ruin a perfectly good soda (or beer), right?
475191
it's my understanding that it doesn't really 'explode' - when liquids freeze they generally expand and become hard. since the coke is contained by a can, with part of the top thinner around the tab (due to the scoring), when the liquid starts freezing in some part of the can the remaining liquid is displaced so there is part ice and part liquid. Finally, the remaining liquid freezes, and because there is less room in the can (due to the previous frozen matter, which has taken up more room)there is not sufficient room for all the  material which is trying to freeze - and the can separates at its weakest points. That's why when you open the freezer you may find some contents which have burst out and refrozen once they have'escaped' confinement.
1025763
Mentos is not very dense and has air pockets in it.  Soda has a low pH and is considered much more acidic than the mentos mint, which is basic enough such that it gets dissolved by your own saliva.  When acids and bases mix, fizzing bubbling usually occurs.  In this case, carbon dioxide builds up in a sealed 2 liter bottle of soda.  The gas is building up and trying to escape, and with help of a little agitation, it ends up bursting through the top of the bottle.
933460
it's the breakdown of food that creates gas. alka seltzer or bicarbonate is recommended.
897121
You don't need to shake the bottle.  A mentos has lots of little nucleation sites, which causes the end result of a lot of gas being released because it's no longer being held in suspension in the liquid.  If you want to get an even bigger reaction, table salt or granulated sugar would be best because there is a lot of surface area, hence more nucleation sites, and then more gas being released faster.
775253
Possibly because beer's foamyness comes naturally from the yeast, while sodas are carbonated with H2CO3 (carbonic acid) and it is not good to drink so much acid so they don't add it in amounts enough to match the foamyness of beer.\n\nAlso some beers such as Guinness use a widget full of liquid nitrogen, that increases the foamy "head" when the can is opened.
248388
There is a slight amount of gas in the joints that builds over a short period of time.  The "pop" is what you hear when the gas is released from the joints.
452186
There are gasses dissolved in the fluid. When you stretch the joint the volume increases and therefore the pressure in that volume decreases. This allows to gas to come out of the liquid. It makes a noise like opening a bottle of soft drink. This is also the same principle that gives divers the bends if they come up too quick. \nThere is a name for the law, it is to do with dissolving gasses in a liquid under pressure. I am suffering a mental block, err henry's law?? russels?? errr.. some plain name like that anyway
93225
The gas is under pressure, so when you press the nozzel the liquid ....mmmmmm better a picture than words..\n\n http://www.aerosol.com/
1013945
shaking it releases alot of gass out, thats why.
779016
Nothing.\nWhat happens w/ regular soda is that mentos have a large surface area of a matte glaze to which the CO2 gas molecules can attach. and they sink to the bottom of the bottle, ejecting the soda out. If there's no gas to attach to the mentos, nothing happens.\nThis is a process called nucleation.
841670
well basically its just a chemical reaction.\n\nSince Soda is basically just made up of sugur,flavoring, water and preservatives. Since Mentos is a heavy peice of candy it sinks to the bottom of the coke bottle which making it easier for more bubbles to be formed from the bottom up. Each Mentos candy has thousands of tiny pits all over the surface. These tiny pits are called nucleation sites - perfect places for carbon dioxide bubbles to form. So thats what causes the eruption and boom it explode.
538547
Not knowing what mentos are, I can't give you a full answer.  However soda pop has a lot of dissolved CO2, which I imagine is forced out of solution.  So you'll have one or both of the two options\n\n1 the mentos act as a surface catalyst for the CO2 to adhere to and congregate into gas bubbles\n\n2 something in the mentos dissolves into the soda pop forcing the "precipitation" of CO2 Gas
551957
because the co2 is pressurized, meaning the molecules have greater kinetic energy even at the same temperature. when the seal is broken, it depressurizes so the kinetic energy of the molecules can equalize, and so lots of co2 molecules rush out, making a whoosh sound because they cause air molecules to vibrate as they move, making sound.
349341
Thats why soda is so bad for you.  Your basically dumping a can of acid into your body.  I can't even imagine the damage it does in there.
97391
When you have fluids and acids in a can (especially soda, since soda has many acids in it), and so forth...when all the pressure expands in the can... it bursts, because there is no room for it to expand any longer.. \n\nGood luck!! \n\nMichelle -- not too good at science..hope this helps! LOL..\nHFA; higher-functioning Autism, Bipolar Disorder, and ADHD.
479009
Pressure increases when dissolved gases come out of solution (leave their dissolved state and become a free gas).\n\nMany things will cause some of the dissolved carbon dioxide in soda to go from dissolved to gas form.  Heat, dissolving something in the soda that is more soluble than CO2 (like salt), impurities in the liquid, and shock or vibration - which create "nucleation" sites that the dissolved gas can collect around and become gaseous.\n\nShaking creates nucleation sites.