electrochem Flashcards
What is the anode
the site of oxidation, it produces electrons
what is the cathode
the site of reduction, it consumes electrons
What is the reducing agent
it is what is oxidized, it produces electrons to cause the reduction of the other substance
what is the oxidizing agent?
it is what is reduced, it consumes the electrons produced by the reducing agent
Why do the electrons flow and in which direction?
They spontaneously flow from the anode to the cathode due to a difference in potential energy
What does it mean when Ecell is positive?
It means the redox reaction is spontaneous
What happens to the mass of the solid at the anode?
It decreases as more of it becomes aqueous
What happens to the mass of the solid at the cathode
it increases as the aqueous solution consumes the electrons to form the solid
What does it mean when a Half reaction is more positive?
It favors reduction and is a better oxidizing agent
What does it mean when a half reaction is more negative
the back reaction favors oxidation and is a better reducing agent
An oxidizing agent will ________ any reducing agent that is
an oxidizing agent will oxidize any reducing agent that is below it
A reducing agent will _______ any oxidizing agent that is
reduce any oxidizing agent that is above it
How do we know if a metal will dissolve in acid?
Any metal below H2/H^+ will dissolve in acid
what happens to the concentration of the solution at the anode?
It increases as the solid mass goes down
what happens to the concentration of the solution at the cathode
it decreases as the aqueous solution forms more solid (causing the mass to increase)
When is a reaction more spontaneous in the forward direction relative to its concentrations?
A reaction is more spontaneous at lower product concentrations, it shifts towards the product side to produce more
When is a reaction less spontaneous relative to its concentrations?
A reaction is less spontaneous when it has fewer reactant concentrations
What are concentration cells?
They are half cells that contain the same substance but the concentrations of aqueous solutes are different.
What is the dilute and concentrated cell?
The dilute cell has a lower concentration than the concentrated cell. The electrons flow from the diluted cell to the concentrated cell.
This causes the aqueous solution in the concentrated cell to consume the electrons and form more solid, thereby decreasing its overall concentration to offset equilibrium
when dealing with a concentrated cell of the same substance, what is true about E°cell at std?
at std the concentrations are the same so the E°cell would be 0.00
