Li(s) | Li+(aq) || Li+(aq) | MnO2(s) , LiMnO2(s) | Pt(s)
Li+(aq) + e- → Li(s) -3.04
write a half-equation for the reaction that occurs at the positive electrode of this cell.
Calculate the standard electrode potential of this positive electrode
emf= 2.91 - answer-Li+ + Mn02 + e- -->...
write a half-equation for the reaction that occurs at the positive electrode of
this cell.
Calculate the standard electrode potential of this positive electrode
emf= 2.91 - answer-Li+ + Mn02 + e- --> LiMn02(s)
2.91 = (x) - (-3.04)
even though oxidation, don't change sign
explain the function of salt bridge? - answer-ions in ionic substance in salt
bridge
move through salt bridge
to maintain charge + balance
use data to
justify why S042- ions
should not be capable of oxidising Br- ions? - answer-E* for S042- <
what are the 2 ways to use hydrogen as fuel for cars.
what is the major advantage of using fuel cell? - answer-one way in fuel cell
to power an electric motor
or as fuel in an internal combustion engine
internal combustion engine wastes > energy
, aluminium used as electrode is rubbed with sand paper before use, explain
why? - answer-To remove oxide layer on aluminium
what would you draw for diagram of a right hand standard hydrogen
electrode with no salt bridge? - answer-H2 gas
given below the electrode
Pt electrode
how can a simple salt bridge be prepared?
In aluminium and hydrogen fuel cell why would this be unsuitable? - answer-
dipping filter paper
into KC032
C032- ions react with acid (H+)
in standard hydrogen electrode
or with Al3+
conc of H+ / Al3+ change / EMF
identify the weakest reducing agent from species in table?
explain how you deduced your answer? - answer-(least oxidising --> so look
on RHS)
(reducing = LFH)
Species on RHS has largest electrode potential + E*
can normal cell reactions be recharged and why? - answer-no
cell reactions not reversed
(Zn oxidised to Zn0)
Zn0 not be reduced to Zn
by passing current through
explain how salt bridge D
provides an
electrical connection between the 2 electrodes?
suggest why KCl not suitable salt for salt bridge in this cell? - answer-ions
able to move through
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