Electrode potentials 0.0 / 5 ? ChemistryElectrode potentialsA2/A-levelEdexcel Created by: champion1607Created on: 24-05-18 09:24 What is an electrochemical cell? Cells made from two different metals dipped in salt solutions of their own ions and connected by a external circuit 1 of 14 What reactions occur in a half cell? Redox reaction 2 of 14 What is a salt bridge? A filter paper soaked in KNO3 which connects the two cells to allow the flow ofnions 3 of 14 What is the emf or cell potential and how is it calculated? A voltmeter in the external circuit shows the voltage between the two half cells 4 of 14 What electrode is used when there are two aqueous substances? Platinum is used as the electrode because its inert and conducts electricity 5 of 14 Negative electrode potential = Oxidation (backwards reaction) 6 of 14 Positive electrode potential = Reduction (forwards reaction) 7 of 14 What do single and double lines mean in shorthand? Double vertical lunes show a salt bridge and things in different phases are separated by a vertical line 8 of 14 Which half-cell goes on the left in the shorthand form? The half cell that has the more negative electrode potential on the left 9 of 14 What is the cell potential equation? More positive electrode potential - more negative electrode potential 10 of 14 What standard are all electrochemical cells based on? You measure the electrode potential of a half cell against a standard hydrogen electrode 11 of 14 What standard conditions need to be in place in a standard hydrogen half cell? Concentrations of 1 mol, temperatures of 298k and pressure of 100Kpa 12 of 14 More reactive a metal is... ...the more it wants to lose electrons to form a positive ion, they have negative electrode potentials 13 of 14 More reactive a non metal is... ...the more it wants to gain electrons to form a negative ion, they form positive electrode potentials 14 of 14
Comments
No comments have yet been made