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With an increase in the amount of sodium bicarbonate , faster buoyancy was achieved due to the increased CO ( 2 ) gas formation .
 Chemical: sodium bicarbonate; Chemical: CO ( 2 )
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: sodium bicarbonate; Chemical: CO ( 2 )