Practice Reactivity 3. What are the mechanisms of chemical change? 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.
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 |
The acid-base indicator phenol red, , changes colour from yellow to red over a pH range of 6.6-8.2. Which statement is correct?
Which compound can be oxidized when heated with an acidified solution of potassium dichromate(VI)?
Which combination of acid and base is most likely to have a pH of 8.5 at the equivalence point in a titration?
What is the major product of the reaction between HCl and but-2-ene?
Which statement is correct?
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 |
What must be present on a nucleophile?