GoodStudent17
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Hi I don’t understand the mark scheme for this question - can you help please
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ejh174
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i'm not 100% certain but i'm pretty sure it's because ground liver has a larger SA than a piece of liver so the enzymes will be able to break it down more quickly = more bubbles produced as reaction will be quicker and on a larger scale
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Salyhaha
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Hey so this question is basically asking you about factors that increase rate of reaction. They are asking why does ground liver and sand have a higher rate of reaction than a whole piece of liver?
So we know that the sand has no effect on rate because we can see in tube C that sand makes the rate 0. Now we can talk about why ground has higher rate than whole piece of liver.
When liver is ground its all mushed up and spread out so there are more cells exposed. There is a larger surface area of the liver compared to whole liver where lots of cells are packed on top of each other and only the ones on the outside are exposed. A higher surface area means the hydrogen peroxide is exposed to more cells so more catalase is released to break it down. So there is a higher rate of reaction because there is more hydrogen peroxide substrate and more catalase enzyme. Hope this helps
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GoodStudent17
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(Original post by ejh174)
i'm not 100% certain but i'm pretty sure it's because ground liver has a larger SA than a piece of liver so the enzymes will be able to break it down more quickly = more bubbles produced as reaction will be quicker and on a larger scale
Hi what is meant by the term ‘ground’ liver - can u help please ?
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ejh174
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(Original post by GoodStudent17)
Hi what is meant by the term ‘ground’ liver - can u help please ?
Yeah of course, it basically means broken up. For example ground pepper is the powdery version you get in restaurants as opposed to whole pepper corns if that makes sense. So the liver is broken up into lots of small pieces giving them a larger SA for the enzymes to act on.
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GoodStudent17
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(Original post by ejh174)
Yeah of course, it basically means broken up. For example ground pepper is the powdery version you get in restaurants as opposed to whole pepper corns if that makes sense. So the liver is broken up into lots of small pieces giving them a larger SA for the enzymes to act on.
Thank u sooooo much!
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GoodStudent17
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(Original post by Salyhaha)
Hey so this question is basically asking you about factors that increase rate of reaction. They are asking why does ground liver and sand have a higher rate of reaction than a whole piece of liver?
So we know that the sand has no effect on rate because we can see in tube C that sand makes the rate 0. Now we can talk about why ground has higher rate than whole piece of liver.
When liver is ground its all mushed up and spread out so there are more cells exposed. There is a larger surface area of the liver compared to whole liver where lots of cells are packed on top of each other and only the ones on the outside are exposed. A higher surface area means the hydrogen peroxide is exposed to more cells so more catalase is released to break it down. So there is a higher rate of reaction because there is more hydrogen peroxide substrate and more catalase enzyme. Hope this helps
Thank u sooooooo much for such a detailed answer - highly appreciated thank u so much for giving your time up for this - thankkksssss ))))))))) I understand it now ))))
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ejh174
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(Original post by GoodStudent17)
Thank u sooooo much!
It's okay, glad I could help
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moby998
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Where did you get this exercise from?
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