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Maxinecarbon dioxide (the gas that makes the bubbles ) is forced into the liquid at the bottling plant and then sealed quickly. The CO2 wants to leave the liquid so you get the bubbles when you drink it. If you wait too long or don't seal the bottle the gas all dissolves into the surrounding air. The plastic 2 liter bottles are actually somewhat porous to the gas and the soft drink will "go flat" after a period of time even if not opened.
It goes flat because it is a solution of carbonic acid H2SO4, which is unstable so it decomposes into CO2 which creates the bubbles and H2O. When it is opened the CO2 is released leaving it flat because there are no more bubbles.
It is a decomposition reaction H2CO3-->CO2+H2O
I hope that is right, I wrote that answer on my lab that I've been working on, and I'm really smart. Your lucky that someone was able to give you the answer:P
When the soda is heated, all of the molecules in it get more kinetic energy. The
liquid part expands a little bit, but that doesn't make much difference. The part
that gets all the attention is the gas (CO2) that's inthe liquid. When any gas is
heated, it wants to occupy more space. If you keep it in the same amount of
space, it gets more pressure. If you keep heating a soda can or bottle, the gas
pressure can build up until it's greater than what the container was designed to
hold, and it's no longer capable of resisting the fierce desire that the gas has to
expand into more space.
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