A-LevelChemistryChemical energeticsFeb/Mar 2017Paper 1 Q71 Mark
A student mixed 25.0 cm³ of 4.00 mol dm⁻³ hydrochloric acid with an equal volume of 4.00 mol dm⁻³ sodium hydroxide. The initial temperature of both solutions was 15.0°C. The maximum temperature recorded was 30.0°C. Using these results, what is the enthalpy change of neutralisation of hydrochloric acid?
A-62.7 kJ mol⁻¹
B-31.4 kJ mol⁻¹
C-15.7 kJ mol⁻¹
D-3.14 kJ mol⁻¹
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of chemical energetics within the Chemistrysyllabus. The examiner's mark scheme requires...
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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...
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