Electrochemical Changes

Oxidation and reduction, and how redox reactions drive electrochemical cells.

11 questions, free, marked as you go with a worked explanation on every one.

What this covers

What happens to a species that is oxidised?
In an electrochemical cell, oxidation occurs at which electrode?
What is the oxidation number of sulfur in the sulfate ion, SO₄²⁻?
What is the oxidation number of chromium in the dichromate ion, Cr₂O₇²⁻?
What is the purpose of a salt bridge in a galvanic cell?
A cell has E°(cathode) = +0.34 V and E°(anode) = −0.76 V. What is the standard cell potential?
Which statements about a galvanic (voltaic) cell are correct? Select all that apply.
Why does galvanising steel with zinc protect it from rusting, even if the coating is scratched?
Use the table. Which metal is the strongest reducing agent, meaning it gives up electrons the most easily?
A voltaic cell is represented as Al(s) | Al3+(aq) || Sn2+(aq) | Sn(s). Which electrode is the cathode?
In the voltaic cell shown, zinc is oxidized and copper is reduced. Which electrode is the anode?