A Levels
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*6364028069*
9701/05
CHEMISTRY
Paper 5 Planning, analysis and evaluation
October/November 2007
1 hour 15 minutes
Candidates answer on the Question Paper.
No Additional Materials are required.
READ THESE INSTRUCTIONS FIRST
Write your Centre number, candidate number and name on all the work you hand in.
Write in dark blue or black pen.
You may use a soft pencil for any diagrams, graphs or rough working.
Do not use staples, paper clips, highlighters, glue or correction fluid.
DO NOT WRITE IN ANY BARCODES.
Answer all questions.
You are advised to show all working in calculations.
Use of Data Booklet is unnecessary.
At the end of the examination, fasten all your work securely together.
The number of marks is given in brackets [ ] at the end of each question or part question.
For Examiner’s Use
1
2
Total
This document consists of 9 printed pages and 3 blank pages.
SPA (NF/CGW) T30933/8
© UCLES 2007
[Turn over
om
.c
s er UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS
General Certificate of Education Advanced Subsidiary Level and Advanced Level
2
1
The hydroxides of Group I metals (LiOH, NaOH, KOH, RbOH, CsOH) are highly corrosive white solids which rapidly absorb water vapour on exposure to the atmosphere.
All of these solids dissolve exothermically in water.
The enthalpy change of solution, ΔHsoln, is the energy change associated with the following reaction. M represents the Group I metal.
M +(aq) + OH–(aq)
M OH(s) + (aq)
The following diagram represents theoretical stages in the formation of aqueous MOH.
M +(g) + OH-(g) + (aq)
lattice energy
hydration enthalpy of the ions
H hydration
M OH(s) + (aq)
H soln
M +(aq) + OH-(aq)
Lattice energy and hydration enthalpy are both more exothermic when ions carry a higher charge and/or ions have a smaller radius.
When comparing Group I hydroxides, changes in ΔHhydration are more significant than
w ap eP
m
e tr .X
w
*6364028069*
9701/05
CHEMISTRY
Paper 5 Planning, analysis and evaluation
October/November 2007
1 hour 15 minutes
Candidates answer on the Question Paper.
No Additional Materials are required.
READ THESE INSTRUCTIONS FIRST
Write your Centre number, candidate number and name on all the work you hand in.
Write in dark blue or black pen.
You may use a soft pencil for any diagrams, graphs or rough working.
Do not use staples, paper clips, highlighters, glue or correction fluid.
DO NOT WRITE IN ANY BARCODES.
Answer all questions.
You are advised to show all working in calculations.
Use of Data Booklet is unnecessary.
At the end of the examination, fasten all your work securely together.
The number of marks is given in brackets [ ] at the end of each question or part question.
For Examiner’s Use
1
2
Total
This document consists of 9 printed pages and 3 blank pages.
SPA (NF/CGW) T30933/8
© UCLES 2007
[Turn over
om
.c
s er UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS
General Certificate of Education Advanced Subsidiary Level and Advanced Level
2
1
The hydroxides of Group I metals (LiOH, NaOH, KOH, RbOH, CsOH) are highly corrosive white solids which rapidly absorb water vapour on exposure to the atmosphere.
All of these solids dissolve exothermically in water.
The enthalpy change of solution, ΔHsoln, is the energy change associated with the following reaction. M represents the Group I metal.
M +(aq) + OH–(aq)
M OH(s) + (aq)
The following diagram represents theoretical stages in the formation of aqueous MOH.
M +(g) + OH-(g) + (aq)
lattice energy
hydration enthalpy of the ions
H hydration
M OH(s) + (aq)
H soln
M +(aq) + OH-(aq)
Lattice energy and hydration enthalpy are both more exothermic when ions carry a higher charge and/or ions have a smaller radius.
When comparing Group I hydroxides, changes in ΔHhydration are more significant than