7. Electrochemistry Flashcards
what happens in a redox reaction
e- transferred from one ionic species to another
what is the reductant and what happens to it
reducing agent
its oxidised - loses e-
what is the oxidant and what happens to it
oxidising agent
reduced - gains e-
the species that loses e- is ___
oxidised
the species that gains e- is ___
reduced
how do you find the oxidation potential from the standard reduction potential table
reverse the half equation and the sign of the reduction potential
what does a galvanic cell do
turns chemical energy into electrical energy
how does a galvanic cell produce energy
uses spontaneous redox reaction to produce electricity
what are electrodes
metallic rods in a galvanic cell
what is the anode
electrode where oxidation and loss of e- takes place
what is the cathode
electrode where reduction or gain or e- takes place
what is the formula for finding the cell potential
Ecell = Ecathode - Eanode
what is a salt bridge used for
prevents buildup of charges in the anode
contains inert electrolyte solution such as KCl whose ions dont react with other ions
what produces the current in a galvanic cell
spontaneous redox reaction
what is the current used to do in an electrolytic cell
current is used to drive a non-spontaneous reaction
