A-LevelChemistryAtoms, molecules and stoichiometryOct/Nov 2013Paper 1 Q81 Mark
Use of the Data Booklet is relevant to this question. The approximate percentage composition of the atmosphere on four different planets is given in the table below. The density of a gas may be defined as the mass of 1 dm³ of the gas measured at s.t.p. Which mixture of gases has the greatest density? [Table showing major gases/% by number of molecules for Jupiter, Neptune, Saturn, Uranus]
AJupiter H2 89.8, He 10.2
BNeptune H2 80.0, He 19.0, CH4 1.0
CSaturn H2 96.3, He 3.25, CH4 0.45
DUranus H2 82.5, He 15.2, CH4 2.3
✓ Correct Answer
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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