Blow up a Balloon with Yeast

Blow up a balloon with yeast (How Yeast Produces waste)

Scientific method

PURPOSE

The purpose of this experiment is to see how yeast (fungi) a living organism produces waste

GATHER INFO

We know yeast is a living organism and like all living organisms, yeast needs energy to survive. Yeast gets it's energy from sugar because yeast cells thrive on sugar. We also know that when yeast, warm water and sugar are combined it causes the solution to bubble and foam up.

HYPOTHESIS

We think that when the solution will bubble and foam up, it will cause the balloon to blow up. We think the balloon will blow up because yeast expands/grows when combined with water and sugar and this will cause the balloon to expand because the balloon is attached to the soda bottle.

OBSERVATION

I observed that air bubbles were formed under the layer of foam when the solution was left aside for twenty minutes. We are guessing the air bubbles have to do something with the yeast producing waste. We also observed that the balloon got bigger after twenty minutes than it was before. We noticed that the balloon got bigger because the foam from the yeast expanded in size till it was up to the balloon and then that's when the balloon started expanding.The yeast solution also smelled really bad. When we opened the bottle yeast exploded everywhere.

STEP 5

Place the soda bottle in a well ventilated place for about twenty minutes. After twenty minutes the balloon will start to expand.

STEP 3:

CONCLUSION

Then add the sugar to the warm water and yeast and then mix it together. The yeast and sugar start to react to each other immediately.

STEP 4:

The balloon blows up/expands in size because as the yeast eats the sugar it releases carbon dioxide. Where there is a lot of oxygen yeast stars its process of respiration (obtaining energy),but without oxygen yeast produces waste.This is the formula for how yeast produces waste: C6H12O6= 2 C2H5OH+ 2 CO2. Carbon dioxide and ethanol are what yeast produce as waste. This proves yeast is a living organism because all living organism produce waste. Another way of saying how yeast produces waste is by calling it fermentation. Fermentation means the chemical breakdown of bacteria, yeast or other microscopic organisms.The balloon expands because, first carbon dioxide fills the bottle up and then fills the balloon because the gas has nowhere else to go. Each piece of yeast has tiny gas bubbles already in it and that's why they produce carbon dioxide as waste.A similar process happens when you bake bread. It happens by first when carbon dioxide from the yeast creates bubbles in the bread and the ethanol from the yeast evaporates by the time the bread is baked.The air bubbles give the bread its airy and fluffy texture once baked.

Then blow the balloon up so it is about the size of your fist.Then take the bottom of the balloon and place it on top on the soda bottle. To secure the balloon add a elastic to the top of the soda bottle.

Experiment

STEP 2:

Then take your packet of yeast and add it to the warm water. The yeast becomes active as it dissolves. You won't be able to see the movement because yeast is a microscopic fungus organism.

STEP 1:

First take your small,clear plastic soda bottle and fill it to about with a inch of warm water.

MATERIALS

*A packet of yeast

*A small, clear plastic soda bottle

*1 teaspoon of sugar

*Warm water (105 degrees F-115 degrees F)

*A balloon

*An elastic