At lunch, you open a can of soda and place a straw into the can to drink. Describe the phases present in the can of sodaChemistry

Liquid, obviously the soda is liquid.

Gas, the carbonation that causes the bubbles and the fizzing sound.

Solid, the straw. 

It also changes from a solution to a heterogeneous mixture.  The bubbles change throughout the can as it is opened and all of the gas is mixed into the soda.