Electrode Potential

why does zinc dipslaces copper

because zinc stronger reducing agent than copper

what is electrochemical series

a ranking of half equation based on reducing power

what happens as the gap in electrochemical sereies is bigger

the more energy is given out

what is a half cell / electrode

A metal dipped into a solution of its own ions

when is displacement not redox

double displacement

equilibrium position and its affects on reducing agent

position of reducing agent equilibrium is to the left of the oxidising agent equilibrium

increase concentration of delocalised electron in metal that acts as reducing agent

which directions will electrons move if wire added

away from reducing agent towards oxidisng agent

what happens to reducing agent as conc of reaction changes

conc of 2e^- decreases

equilibrium position left

sending more electrons throwugh wire

what happens to oxisidising agent as conc of

conc of 2e^- increases

equilibrium postion to the right

more ions come out of solutions , balancing out some of new electrons

what potential diffrencence and unit

diffrenece between reducings agent and oxidisng agent

voltage

diffrence between P.D and Electrotimotive force

electromotive force rules out factors like resistenece wire to get maximum possible voltage

why use hydrogen to compare

readily available and cheap

why us platinium

conduct electricity and will not reaact

since hydrogen is not metal how we use it

connect wire to platinium

dip into solution containtg H+ ions

bubble H2 gas through solution

what happens to hydrogen if other stronger reducing agent

hudrogen ions pick up electrons from platiumin to form H2 gas

what happens if other weaker reducing agent

hudrogen gas oxides to hydrogen ions

electrons flow throguh platinuim strip

what is electrode potential

comapring each reducing strenght to hydrogen

what is a more negative electrode potential mean

stronger redusinc agent

what is more positive electrode potential mean

stronger oxidising agent

what happens to electrode potential when pressure decreases

decrease in pressure , decrease in conc of H2 gas , equilibrium position to the right so electrode potential more positive

if equilibirum shifts left what happens to electrode potential

electrode potential more negative

if equilibirum shifts rights what happens to electrode potential

electrode potential more positive

what does it mean if electrode potential is negative

electrons flow right to left

positive on left

what does it mean if electrode potential is positive

electrons flow left to right

positive on right

how to work out electrode potential cell

electrode potential of right - electrode potential of negative