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Fermentation

The enzymes in yeast break down sugar (glucose) into alcohol (ethanol) and carbon dioxide gas.

glucose    ethanol  +  carbon dioxide
C₆H₁₂O₆(aq)    2 C₂H₅OH(aq)  +  2 CO₂(g)

This reaction, which takes place in the absence of oxygen, is called fermentation.

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