Electrochemical cells (1) (AHL) questions

Assignment: Questions on Topic 19.1: Electrochemical cells (1) AHL - Standard electrode potentials

This page of questions can be marked as direct student access either for assigning as a test or for students to work on in their own time. If you do not wish to use student access, links to downloadable versions of the questions and, separately the worked answers, can be found at Printable versions of written tasks.

Consider a cell made up from the following two half-cells:

Ni2+(aq) + 2e– ⇌ Ni(s) E⦵= – 0.26 V

Ag+(aq) + e– ⇌ Ag(s) E⦵ = + 0.80 V

i.  Deduce the spontaneous reaction that will occur when the cell is operating.

1 line
Show model answer


ii. Identify the positive and negative electrodes of the cell.

2 lines
Show model answer


iii. Identify the species that is being oxidised and the species that is being reduced.

2 lines
Show model answer


iv. Deduce the overall cell potential under standard conditions.

1 line
Show model answer


v. Calculate the Gibbs energy change for this reaction at standard conditions.

1 line
Show model answer

 

 

Deduce the equation for the spontaneous reaction that occurs when a dichromate half-cell, Cr2O72−(aq),H+(aq)/Cr3+(aq),H2O(l), comes into contact with an iodine half-cell, ½I2(l)/I–(aq).

2 lines
Show model answer

 

 

Use standard redox potentials to show whether tin(II) ions can reduce iron(III) ions.
(Given: Sn4+(aq)/Sn2+(aq) E⦵ = + 0.15 V)

5 lines
Show model answer

 

 

Show that when copper(I) salts come into contact with water they undergo disproportionation. That is, they are spontaneously oxidized and reduced at the same time.

5 lines
Show model answer

 

 

Draw a labelled diagram of a cell made up from a Mg(s)/Mg2+(aq) half-cell connected to a Mn(s)/Mn2+(aq) half-cell operating under standard conditions.
Show the direction of electron flow in the external circuit and deduce the potential of this cell in volts.
(Upload your answer as an image or as a pdf file.)

10 lines
Show model answer

 

 

All materials on this website are for the exclusive use of teachers and students at subscribing schools for the period of their subscription. Any unauthorised copying or posting of materials on other websites is an infringement of our copyright and could result in your account being blocked and legal action being taken against you.