I like that experiment. Carbon dioxide is a gas
that is pushed into soda, so it starts coming back
out of the soda as soon as you open it. I'm
guessing there's a difference in how far the soda
car goes if you shake the soda before you open it,
or if you don't shake the soda. Any soda with
sugar in it will be sticky, so I hope you have a
place to test your cars where that's ok.
The fizz that bubbles up when you crack open a
can of soda is carbon dioxide gas
(CO2). Soft drink manufacturers add
this tingling froth by forcing carbon dioxide and
water into your soda at high pressures—up to 1,200
pounds per square inch.