a carbonated beverage contains water and dissolved carbon dioxide & water is a kind of substance & carbon dioxide is a kind of substance ->  a carbonated beverage contains one substance dissolved in another substance  a carbonated beverage contains one substance dissolved in another substance & a solution is formed by one substance being dissolved in another substance ->  a carbonated beverage is a kind of solution  a carbonated beverage is a kind of solution & a solution is a mixture ->  carbonated beverage is a kind of mixture  carbonated beverage is a kind of mixture & soda water is a kind of carbonated beverage -> soda water is a kind of mixture