What happens when Hydrogen Peroxide is mixed with Yeast?

This is the reaction of hydrogen peroxide and yeast mixed together.

When hydrogen peroxide and yeast are mixed, the temperature increased. This was an exothermic reaction because it released heat, not absorbed it. The lowest temperature was 22.4 degrees Celsius and the highest temperature was 27.3 degrees Celsius.

Graph of Experiment

Here is the graph of the temperature as it increased throughout the experiment.

Breakdown of the Reaction

& evidence that it's a chemical reaction

The balanced chemical equation of this mixture is 2 H2O2 → 2 H2O + O2

In this reaction, the yeast's enzyme "catalase" turns the hydrogen peroxide into water and oxygen, both harmless to the yeast. When you pour the hydrogen peroxide onto the yeast, you're seeing the effect of the enzyme and the reaction it produces. When the yeast processes sugar, it produces carbon dioxide as a product of the processes. The production of the carbon dioxide will not right away show, but while using the sugar, it will eventually produce bubbles. The bubbles are carbon dioxide. This also produces ethanol or alcohol in the reaction. The Law of Conservation of Mass is as follows:

Reactants:                                                                                                                   Products:   

2 H                                                                                                                                2 H

4 O                                                                                                                                4 O


Video of the Experiment


The sites that I used are:

https://answers.yahoo.com/question/index?qid=20100... for the Breakdown of the Reaction Summary.

http://www.nt.ntnu.no/users/preisig/Repository/TKP_4110_Felles_Lab/experiment%20descriptions/Full%20description%20yeast%20experiment.pdf for the chemical equation.

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