When H2O2 is added to blood , it creates a foam. what is in the blood that makes foam with hydrogen peroxide. ?
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The reason why it foams is because blood and cells contain an enzyme called catalase. Since a cut or scrape contains both blood and damaged cells, there is lots of catalase floating around.
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When poured onto a cut or scrape, hydrogen peroxide encounters blood and damaged skin cells. These contain an enzyme called catalase, which breaks down the hydrogen peroxide into water and oxygen. The fizzing you see in the form of bubbles is the oxygen gas escaping
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