A-LevelChemistryAtoms, molecules and stoichiometryOct/Nov 2011Paper 1 Q91 Mark
The use of sucrose in food processing depends in part on osmotic pressure, symbol Π. In dilute solution, Π varies with concentration in a similar way to gas behaviour. The equation ΠV = nRT can be used, where n is the number of moles of solute molecules contained in volume V at temperature T. The number of moles of solvent molecules should be ignored. Under aqueous acidic conditions sucrose is hydrolysed. C12H22O11 + H2O → CH2OH(CHOH)4CHO + CH2OH(CHOH)3COCH2OH sucrose glucose fructose What can be deduced from this hydrolysis equation?
Athe osmotic pressure: decreases, glucose and fructose are: optical isomers
Bthe osmotic pressure: decreases, glucose and fructose are: structural isomers
Cthe osmotic pressure: increases, glucose and fructose are: optical isomers
Dthe osmotic pressure: increases, glucose and fructose are: structural isomers
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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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