Transfer of electrons at a distance
Label the diagrams (see Question 1) and complete the half-equations for the oxidation and reduction
half-reactions in the U-tube. Colour the oxidizing agent and reducing agent, draw arrows to show the
direction of electron flow and complete the information cards for each question.
Question 1:
Electrode: …..
Oxidising agent: …………………………….
Galvanometer
Undergoes ………………………………………
X
FeSO4
0.1 mol dm-3
H2SO4
0.1 mol dm-3
Y
H+/KMnO4
0.1 mol dm-3
Half-equation:
Colour change:
Electrode: …..
Reducing agent: …………………………….
U-Tube
Undergoes ………………………………………
Half-equation:
Colour change:
Question 2: Bromine water/ potassium iodide
Oxidising agent: …………………………….
Undergoes ………………………………………
Half-equation:
Colour change:
Reducing agent: …………………………….
Undergoes ………………………………………
Half-equation:
Colour change:
Question 3: Potassium iodide/ acidified
potassium dichromate(VI)
Oxidising agent: …………………………….
Undergoes ………………………………………
Half-equation:
Colour change:
Reducing agent: …………………………….
Undergoes ………………………………………
Half-equation:
Colour change:
Question 4: Potassium bromide/ Iron(III) nitrate
Oxidising agent: …………………………….
Undergoes ………………………………………
Half-equation:
Colour change:
Reducing agent: …………………………….
Undergoes ………………………………………
Half-equation:
Colour change: