ATAR Notes: Forum
VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: matt123 on November 10, 2010, 05:27:16 pm
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I read somewhere that they ONLY use these barriers in fuel cells and not normal redox galvanic cells.
Why is this?
I thought they were used to allow conductivity and to separate the reactants?
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?
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Lets the gases out and allows for the electrolyte to pass through without reactants coming into contact and spontaneously reacting.
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i did this question in the neap book yesterday
it says the use of the porous barrier is to disable contact between the two reactants
so that therefore they are unable to react
hope that helps dude :)
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yeha but they can't ask us a question on the electrolysis of alumina or the Hall or Downs cell unless they give us a diagram with the appropriate info??
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yeha but they can't ask us a question on the electrolysis of alumina or the Hall or Downs cell unless they give us a diagram with the appropriate info??
we seriously dont know what vcaa is capable of
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I don't think so. They would want application of knowledge not the whole state's vomit on the exam papers. :buck2:
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I don't think so. They would want application of knowledge not the whole state's vomit on the exam papers. :buck2:
bah
they're pretty sick, never know
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Lets the gases out and allows for the electrolyte to pass through without reactants coming into contact and spontaneously reacting.
Then can we use them in Galvanic cells ( or no , because they are 2 separate cells ?)
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Lets the gases out and allows for the electrolyte to pass through without reactants coming into contact and spontaneously reacting.
Then can we use them in Galvanic cells ( or no , because they are 2 separate cells ?)
separate cells so no.
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A fuel cell is a galvanic cell.
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In general I think a porous barrier is used to let some ions pass through to each electrode but not others. For whatever reason I guess depends on the context of the question?
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As far as i know, the porous barrier serves the same purpose as a salt bridge.
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yeah from all that i'm getting the idea that a porous barrier is identical to a salt bridge but, the set up looks different...
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yeah from all that i'm getting the idea that a porous barrier is identical to a salt bridge but, the set up looks different...
Yer thats exactly right.
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yeah from all that i'm getting the idea that a porous barrier is identical to a salt bridge but, the set up looks different...
Yer thats exactly right.
but a porous barrier is used in a cell ( cant remember ) where the Na+ ions go through the barrier and connect to the OH- ions that make NaOH which is used for stuff. So i guess its not the EXACT same purpose
which cell is this, anyone remember?
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nelson / diaphragm cell i think :)