A-LevelChemistryChemical energeticsMay/June 2013Paper 1 Q101 Mark

Use of the Data Booklet is relevant to this question. A student mixed 25 cm³ of 0.10 moldm⁻³ sodium hydroxide solution with 25 cm³ of 0.10 moldm⁻³ hydrochloric acid and noted a temperature rise of 2.5°C. What is the enthalpy change of the reaction per mole of NaOH?

Q: What is the correct answer to this A-Level Chemistry question?

The correct answer is A: -209 kJ mol⁻¹.

Q: What topic does this question test?

This question tests Chemical energetics in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

A-209 kJ mol⁻¹

B-104.5 kJ mol⁻¹

C-209 J mol⁻¹

D-522.5 J mol⁻¹

✓ Correct Answer

The correct answer is A: -209 kJ mol⁻¹

📋 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

Join thousands of Cambridge students already using Oracle Prep

About This A-Level Chemistry Question

Topic

This multiple-choice question tests Chemical energetics in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry May/June 2013 examination, Paper 1 Variant 2.

Practice on Oracle Prep

Oracle Prep provides AI-powered practice for all Cambridge O-Level and A-Level subjects. Our platform includes topic predictions with 87.7% accuracy, AI essay grading, and a comprehensive question bank spanning 25 years of past papers across 29 subjects.