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Electrochemistry and Redox Equilibria - Answers
1. In a redox reaction, one substance is oxidised and the other is reduced:
Oxidation is the gain of oxygen
Reduction is loss of oxygen
Neither oxidation nor reduction can take place on its own and they happen simultaneously, e.g. when methane is
burnt…

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12. Disproportionation is a redox reaction in which an element in a single species is simultaneously oxidized and
reduced. E.g. when a chlorine gas is bubbled into aqueous NaOH, a disproportionation reaction takes place. One
atom in the Cl2 molecules is oxidized to NaOCl and on is reduced to NaCl.…

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18. Comparing values of E°:
The more negative the E° value, the more the position of equilibrium lies to the left - the more readily
the metal loses electrons. The more negative the value, the stronger reducing agent the metal is.
The more positive the E° value, the more the…

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26. Iron (II) ions are the reducing agent:
a) Reduction of vanadium (V) to vanadium (IV). The reactants are VO2+ and Fe2+, so the first equation must be
reversed:
VO2+ + 2H+ + e- VO2+ + H2O E= +1.00V
Fe2+ (aq) Fe3+ (aq) + e- E= -0.77V
The overall equation…

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Absorption within a solid.
Adsorption & absorption allow a lot of hydrogen to be stored at room temperature, but current
absorbers and absorbers have limited lifetimes.
Hydrogen has to be manufactured; e.g. by electrolysis of water but this requires energy.
Fuel cells have limited lifetimes and need to be replaced…

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