A-LevelChemistryAtoms, molecules and stoichiometryOct/Nov 2016Paper 1 Q41 Mark
When copper reacts with a 50% solution of nitric acid, nitrogen monoxide is evolved and a blue solution results. The balanced equation for this reaction is shown. pCu + qHNO₃ → rCu(NO₃)₂ + sH₂O + tNO What are the values of the integers p, q, r, s and t?
Ap=1, q=4, r=1, s=2, t=2
Bp=2, q=6, r=2, s=3, t=2
Cp=2, q=8, r=2, s=4, t=4
Dp=3, q=8, r=3, s=4, t=2
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The correct answer is D. This question tests the candidate's understanding of atoms, molecules and stoichiometry 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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