Final answer:
When sugar is added to a yeast solution, fermentation occurs, resulting in the production of carbon dioxide gas and ethanol.
Step-by-step explanation:
When you add sugar to a yeast solution, the yeast will undergo a process called fermentation. During fermentation, yeast breaks down the sugar molecules and converts them into carbon dioxide gas and ethanol. This process is anaerobic, meaning it occurs in the absence of oxygen.
For example, when you add sugar to a yeast solution in bread dough, the yeast carries out fermentation, producing carbon dioxide gas. The gas gets trapped in the dough, causing it to rise and create air pockets, resulting in fluffy bread.
In the case of brewing beer, when sugar is added to a yeast solution, the yeast carries out fermentation, converting the sugar into alcohol (ethanol) and carbon dioxide gas. The carbon dioxide gas is released as bubbles, while the alcohol contributes to the alcoholic content of the beer.