ATAR Notes: Forum
VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: gmx on August 29, 2010, 12:48:15 am
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1
"Delta H is the energy released per 1 mol."
Is that 1 mol of the reactant question mark and of WHICH reactant since there might be 2 with 2 different molar co-efficients.
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2
Apart from the 'external supply of power' part, is the difference between galvanic and electrolytic cells only that Cathode is negative in electrolytic cells and the cathode is positive in galvanic cells (and thus the anode polarity is mirrored as well)?
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3
how can a cathode possibly be NEGATIVE in an electrolytic cell. That's retarded! I get how it is POSITIVE in your usual galvanic cell. Electrochemistry is fucking hard! Explain please!
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1) The moles as specified by the equation.
2) In galvanic cells, the reaction is spontaneous, and so chemical energy can be converted into electrical energy via this reaction. In electrolytic cells, it's the opposite; the reaction is not spontaneous, and so energy (electrical energy) is required to allow the reaction to proceed, converting this energy into chemical energy.