Dynamic electrochemistry Flashcards
What is the difference between a Galvanic and Electrolytic cell?
Galvanic = Energy released by spontaneous redox reaction is converted to electrical energy
Electrolytic = Electrical energy is used to drive nonspontaneous redox reaction
What does the current / voltage axis indicate?
Why is a salt bridge ideal?
Completes the circuit but without contaminating the solutions
What does SHE stand for?
Standard hydrogen electrode
What are the 6 types of reference electrode?
What are the 4 types of electrochemical curcuits?
- Half cell A
- Half cell B
- Internal Current
- External Current
Describe Half cell A mechanism
Describe Internal Current mechanism
Counter-ions move through solution to balance
charge
Describe External Current mechanism
Electron travels through circuit
Describe Half cell B mechanism
Define Amps (I, A)
Charge per time that passes through the electrochemical circuit
1 A = 1 C/s = 1 coulomb per second
What is the equation that tells us the rate of product formation (N)?
Rate of product formation = current (as function of time) over Faraday constant and electron molar ratio (also constant for a given reaction)
What is the equation for faradaic current (iF) redox reactions?
In real electrochemical experiments you must be careful because non-Faradaic currents also exist (i.e. current that is not due to a redox reaction)
Draw a diagram of a general electrochemical reaction
