Practice R3.2 Electron transfer reactions with authentic IB Chemistry exam questions for both SL and HL students. This question bank mirrors Paper 1A, 1B, 2 structure, covering key topics like atomic structure, chemical reactions, and organic chemistry. Get instant solutions, detailed explanations, and build exam confidence with questions in the style of IB examiners.
Voltaic cells convert chemical energy into electrical energy.
Identify the direction of electron flow in a zinc–copper voltaic cell.
State the species reduced at the cathode.
Explain why the flow of electrons occurs in that direction.
Which of the following is always true in a redox reaction?
What are the products of electrolysis when molten calcium bromide is electrolysed using graphite electrodes?
| Product at cathode (negative electrode) | Product at anode (positive electrode) | |
|---|---|---|
| A. | calcium | bromine |
| B. | bromine | calcium |
| C. | calcium ions | bromide ions |
| D. | bromide ions | calcium ions |
Which compound can be oxidized when heated with an acidified solution of potassium dichromate(VI)?
What are the products of electrolysis when concentrated calcium bromide solution is electrolysed using graphite electrodes?
| Product at cathode (negative electrode) | Product at anode (positive electrode) | |
|---|---|---|
| A. | hydrogen | bromine |
| B. | calcium | oxygen |
| C. | calcium | bromine |
| D. | hydrogen | oxygen |
Which compound contains sulfur with an oxidation state of +6?
Which element undergoes reduction in the following reaction?
What is the change in the oxidation state of oxygen?
What are the products of electrolysis of concentrated aqueous sodium bromide?
| Answer | Positive electrode | Negative electrode |
|---|---|---|
| A | ||
| B | ||
| C | ||
| D |
Which factor does not affect the value of the standard electrode potential of a half-cell?