A-LevelChemistryAtoms, molecules and stoichiometryMay/June 2015Paper 1 Q21 Mark
The shell of a chicken's egg makes up 5% of the mass of an average egg. An average egg has a mass of 50 g. Assume the egg shell is pure calcium carbonate. How many complete chicken's egg shells would be needed to neutralise 50 cm³ of 2.0 mol dm⁻³ ethanoic acid?
A1
B2
C3
D4
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The correct answer is B. 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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