Students will observe the chemical reaction between yeast and sugar, which produces carbon dioxide gas that inflates a balloon. This project teaches about fermentation and gas production.
If I mix yeast with sugar and warm water, then the yeast will produce carbon dioxide gas, causing the balloon to inflate.
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Add warm water to the bottle.
Pour in the packet of yeast.
Add sugar to the bottle and stir gently.
Stretch the balloon and place its neck over the bottle opening.
Wait and observe the balloon as it starts to inflate.
Record the time it takes for the balloon to inflate fully.
Compare results with different amounts of sugar.
The yeast will react with the sugar to produce carbon dioxide gas, inflating the balloon as a visible sign of gas production.
Amount of sugar
Time taken for balloon to inflate
Amount of yeast, Temperature of water, Size of the balloon
Ensure the bottle is secure to prevent spills. Handle the balloon carefully to prevent popping.
Demonstrate the experiment live if possible.
Use a chart to show how different sugar amounts affect inflation time.
Explain the process of fermentation simply.
