R3.2 Electron transfer reactions (HL)
15 revision questions with answers for R3.2 Electron transfer reactions (HL). Read them here, or play the set as a class game on the projector. Free to host, and students join with a code.
Reference half-cell assigned E⦵ = 0.00 V?
- Calomel electrode
- Standard hydrogen electrodeRight answer
- Glass electrode
- Silver electrode
What this set covers
Redox at HL: the standard hydrogen electrode, calculating E⦵cell, spontaneity, ΔG⦵ = −nFE⦵, strongest oxidising and reducing agents, electrolysis of aqueous solutions, and finally electroplating of objects.
- Common mix-up
- Students often mix up the sign convention: the half-cell with the more positive E⦵ is reduced, and E⦵cell is that value minus the other.
- Revision tip
- Calculate E⦵cell for the Zn/Cu and Mg/Ag questions, then predict the cathode and anode products for aqueous NaCl and CuSO₄.
All 15 questions and answers
Reference half-cell assigned E⦵ = 0.00 V?
Answer: Standard hydrogen electrode
[H⁺] in the standard hydrogen electrode?
Answer: 1.0 mol dm⁻³
E⦵cell for a Zn/Zn²⁺ (−0.76 V) and Cu²⁺/Cu (+0.34 V) cell?
Answer: +1.10 V
E⦵cell for a Mg²⁺/Mg (−2.37 V) and Ag⁺/Ag (+0.80 V) cell?
Answer: +3.17 V
The half-cell with the more positive E⦵ undergoes…?
Answer: Reduction
A positive E⦵cell means the cell reaction is…?
Answer: Spontaneous
Equation linking ΔG⦵ to E⦵?
Answer: ΔG⦵ = −nFE⦵
Value of the Faraday constant?
Answer: 9.65 × 10⁴ C mol⁻¹
Strongest oxidising agent in the table of standard electrode potentials?
Answer: F₂
Of these metals, which is the strongest reducing agent?
Answer: Li
Product at the anode in the electrolysis of concentrated aqueous NaCl?
Answer: Chlorine
Product at the cathode in the electrolysis of aqueous NaCl?
Answer: Hydrogen
Product at an inert anode in the electrolysis of aqueous CuSO₄?
Answer: Oxygen
Coating a steel spoon with silver using a current and silver nitrate solution?
Answer: Electroplating
In electroplating, the object to be coated is made the…?
Answer: Cathode
Play it as a class game
Play this set opens it in splycr, where you can host it for your class straight away. Hosting needs no account: put the room code on the projector, and students join from a phone with the code and their first name. Each question plays as multiple choice, and the three wrong options were written for that question.