AP Electrochemistry Concepts Flashcards
Adding a product ____ the voltage
decreases
Adding a reactant ____ the voltage
increases
E is always the ___ sign of delta G
opposite
Always flip which half reaction?
the oxidation
What happens if you physically separate the oxidation and reduction half reactions?
you get a battery
What is the anode and what does it do?
it is the oxidation half reaction and it generates (then loses) electrons
What is the cathode and what does it do?
it is the reduction half reaction and it gains (then uses) the electrons
Which way do the electrons flow?
from the anode to the cathode
True/False: you must have a net positive voltage when flipping one reaction to have a spontaneous redox reaction
True
If voltage is negative, reaction shifts
left (delta G is positive and K
If voltage is positive, reaction shifts
right (delta G is negative and K > 1 more products than reactants)
What is standard potential (E)?
voltage at 1 M, 1 atm, 298 K
Can a battery work without a salt bridge?
NO
How to balance redox reaction
1) find half reactions on chart
2) half reaction above becomes reduction, half reaction below becomes oxidation
3) remember to flip oxidation half reaction and flip the sign of the voltage (making sure reaction ends up w/ net positive voltage)
4) solve redox reaction normally
What are n and F in delta G = nFE*?
*standard potential
n- moles of electrons that flow between the half cells
F- Faraday constant 96500 coulombs/mole of electrons
