Gce Model Questions Vol1 2017 Chemistry Question 4

Practice essay / theory question 4 from the 2017 Gce Model Questions Vol1 Chemistry examination. This question covers mole concept, empirical formula, percent composition, combustion reaction, solution preparation, cyclic hemiacetal formation .

Gce Model Questions Vol1 2017 Chemistry Essay / Theory
Topics: mole concept empirical formula percent composition combustion reaction solution preparation cyclic hemiacetal formation
Question 4 GCE_MODEL_QUESTIONS_VOL1 • 2017 • CHEMISTRY • essay

The diagram shows the structural formula of D‑glucose, a common monosaccharide. Using the information from the diagram, answer the following questions.

Question Parts

( a )
Determine the empirical formula of glucose from the structural diagram.
( ) Write the empirical formula.
( ) State the molecular formula.
( ) Calculate the percent by mass of carbon in glucose.
( b )
A 180 g sample of glucose is completely combusted in excess oxygen.
( ) Write the balanced chemical equation for the combustion of glucose.
( ) Calculate the volume of CO₂ (at STP) produced from the 180 g sample.
( c )
A laboratory preparation requires 0.50 mol of glucose to be dissolved in water to make a 0.250 mol L⁻¹ solution in a 2.00 L volumetric flask.
( ) Calculate the mass of glucose needed.
( ) Determine the mass of water required to prepare the solution (assume the density of water is 1 g mL⁻¹ and the volume of solute is negligible).
( d )
In aqueous solution glucose can cyclise to a six‑membered hemiacetal where carbon 1 bonds to the oxygen on carbon 5, forming a pyranose ring. Using the diagram, explain how this cyclisation changes the number of distinct hydroxyl groups that can act as reducing ends.

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About This Question

This is Gce Model Questions Vol1 2017 Chemistry Question 4. It is one of the essay questions from the 2017 Gce Model Questions Vol1 Chemistry examination.

The question covers mole concept, empirical formula, percent composition, combustion reaction, solution preparation, cyclic hemiacetal formation .

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