A-LevelChemistryChemical energeticsMay/June 2017Paper 1 Q331 Mark
Which statements about endothermic reactions are correct? 1 On the reaction pathway diagram the products of the reaction are lower than the reactants. 2 There is a net transfer of heat energy from the surroundings to the reacting system. 3 the total bond energies of the reactants > the total bond energies of the products
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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