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Their kinetic behavior and the reaction mechanisms of carboxylating enzymes are difficult to study because CO ( 2 ) is inconvenient to handle as a gas , exists in equilibrium with bicarbonate in aqueous solution , and typically yields products that show no significant spectroscopic differences from the reactants in the UV / Vis range .
 Chemical: CO ( 2 ); Chemical: bicarbonate
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: CO ( 2 ), bicarbonate 
Answer:
 Chemical: CO ( 2 ); Chemical: bicarbonate