IB DP Chemistry Standard Level (2023 syllabus) · IB ib-chem-sl
R3 Reactivity 3: What are the mechanisms of chemical change?
Written & reviewed by James Millett — Biology (Imperial College London), PGCE Science (University of Cambridge).
Practice questions on Reactivity 3: What are the mechanisms of chemical change?
- Explain why propene undergoes electrophilic addition with hydrogen bromide but benzene doe… (4 marks, Explain)
- Explain the mechanism by which ethene reacts with hydrogen bromide to form bromoethane, in… (4 marks, Explain)
- Explain why but-1-ene reacts with bromine water to produce a major product and a minor pro… (4 marks, Explain)
- Explain why a standard hydrogen electrode is assigned a standard electrode potential of ex… (4 marks, Explain)
- Explain why a mixture of ammonia solution and ammonium chloride solution acts as a buffer,… (4 marks, Explain)
- Explain why the pH of a solution of carbonic acid (H₂CO₃) is higher than the pH of a hydro… (4 marks, Explain)
- Explain why a buffer solution containing ethanoic acid and sodium ethanoate resists a sign… (4 marks, Explain)
- Explain why a solution of ammonium chloride (NH₄Cl) is acidic at 25 °C, with reference to … (4 marks, Explain)
- Explain why a solution of sodium ethanoate (CH₃COONa) has a pH greater than 7 at 25 °C. (4 marks, Explain)
- Explain why benzene undergoes electrophilic substitution with concentrated nitric acid in … (4 marks, Explain)
- Explain what happens at each electrode when a voltaic cell is constructed using a magnesiu… (4 marks, Explain)
- Explain why zinc displaces copper from a solution of copper(II) sulfate, with reference to… (4 marks, Explain)
- Explain how electrolysis of molten lead(II) bromide produces lead and bromine, identifying… (4 marks, Explain)
- Explain how the sign and magnitude of a standard cell potential (E°cell) can be used to pr… (4 marks, Explain)
- Explain why cyclohexene decolourises bromine water rapidly at room temperature, whereas be… (4 marks, Explain)