A-LevelChemistryChemical energeticsOct/Nov 2021Paper 1 Q341 Mark
When the liquid N2F4 is heated, it decomposes into a single product, X. Which statements are correct? 1 N-F bonds are broken during this decomposition. 2 The enthalpy change when N2F4 decomposes into X is approximately +160 kJ mol⁻¹. 3 Molecules of X are non-linear.
A1, 2 and 3 are correct
B1 and 2 only are correct
C2 and 3 only are correct
D1 only is correct
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The correct answer is C. 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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