A-LevelChemistryReaction kineticsFeb/Mar 2024Paper 1 Q151 Mark
Two experiments are carried out to study the reaction between zinc and sulfuric acid. experiment 1 Small lumps of zinc are added to excess dilute sulfuric acid. experiment 2 The reaction is carried out at a lower temperature and with one other change. Both experiments produce the same total volume of gas and are completed in the same time. What is the second change made in experiment 2?
Acatalyst is added.
Bgreater mass of zinc is added.
Cgreater volume of sulfuric acid is added.
DLarger lumps of zinc are used.
✓ Correct Answer
The correct answer is A: catalyst is added.
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
🔒
Unlock the Examiner's Analysis
Sign up for free to reveal the full examiner report, trap analysis, and mark scheme breakdown for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep