Why do raisins float and sink in water?

Raisins sink in water because they are denser. However, the carbon dioxide molecules found in soda float to the top because they want to escape from the liquid. These CO2 molecules (seen as bubles) attatch to the raisins pulling them up to the surface as well.

When the CO2 bubles reach the surface, they pop and the raisins begin to sink again.

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