A Level Chemistry 9701/23/M/J/20 Q3

Question

3 Sucrose is a white crystalline solid, C12H22O11. In reaction Z, sucrose reacts with water in the presence of a catalyst, aqueous hydrochloric acid, to form glucose and fructose.
(a) (i) Suggest a name for the reaction that occurs when sucrose reacts with water to form glucose and fructose.
(ii) If no catalyst is added in reaction Z, the reaction is very slow.
Label the Boltzmann distribution to show the effect of adding a catalyst to the sample of sucrose and water molecules at constant temperature.
Explain your labelled diagram.
(b) Both fructose and glucose contain chiral centres.
(i) Explain what is meant by the term chiral centre.
(ii) On the diagram of the fructose molecule, label all the chiral centres with an asterisk (*).
(c) (i) Explain what is meant by the term enthalpy change of combustion.
(ii) Write the equation for the complete combustion of sucrose.
The enthalpy change of reaction Z, ∆Hr, can be calculated using the enthalpy change of combustion data given in the table.
(iii) Use the data in the table to calculate the enthalpy change for the reaction occurring when sucrose reacts with water, ∆Hr. You should draw a labelled Hess’ cycle to show your working.

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    2021-03-27T17:19:11+08:00

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