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Surname
Forename(s)
Candidate signature
AS
CHEMISTRY
Paper 2: Organic and Physical Chemistry
Specimen materials (set 2) 1 hour 30 minutes
Materials
For this paper you must have:
• the AS Chemistry Data Sheet/Periodic Table
• a ruler with millimetre measurements
• a calculator, which you are expected to use where appropriate.
Instructions
• Use black ink or black ball-point pen.
• Answer all questions.
• You must answer the questions in the spaces provided. Do not write outside the box around each
page or on blank pages.
• All working must be shown.
• Do all rough work in this book. Cross through any work you do not want to be marked.
Information
• The maximum mark for this paper is 80.
• The AS Chemistry Data Sheet/Periodic Table is provided.
Advice
• You are advised to spend about 65 minutes on Section A and 25 minutes on Section B.
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, 2
Section A
Answer all questions in this section.
0 1 Nitryl chloride reacts with nitrogen monoxide according to the equation:
ClNO2(g) + NO (g) NO2(g) + ClNO(g)
The Maxwell–Boltzmann distribution curve in Figure 1 shows the distribution of
molecular energies in 1 mol of this gaseous reaction mixture (sample 1) at 320 K.
Figure 1
0 1 . 1 On the same axes, draw a curve for sample 1 at a lower temperature.
[2 marks]
0 1 . 2 Explain the effect that lowering the temperature would have on the rate of reaction.
[2 marks]
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, 3
0 1 . 3 A Maxwell–Boltzmann distribution curve was drawn for a second sample of the
reaction mixture in the same reaction vessel. Figure 2 shows the results.
Figure 2
Deduce the change that was made to the reaction conditions.
Explain the effect that this change has on the rate of reaction.
[3 marks]
Change
Explanation
7
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Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
AS
CHEMISTRY
Paper 2: Organic and Physical Chemistry
Specimen materials (set 2) 1 hour 30 minutes
Materials
For this paper you must have:
• the AS Chemistry Data Sheet/Periodic Table
• a ruler with millimetre measurements
• a calculator, which you are expected to use where appropriate.
Instructions
• Use black ink or black ball-point pen.
• Answer all questions.
• You must answer the questions in the spaces provided. Do not write outside the box around each
page or on blank pages.
• All working must be shown.
• Do all rough work in this book. Cross through any work you do not want to be marked.
Information
• The maximum mark for this paper is 80.
• The AS Chemistry Data Sheet/Periodic Table is provided.
Advice
• You are advised to spend about 65 minutes on Section A and 25 minutes on Section B.
Barcode v1.0 7404/2
, 2
Section A
Answer all questions in this section.
0 1 Nitryl chloride reacts with nitrogen monoxide according to the equation:
ClNO2(g) + NO (g) NO2(g) + ClNO(g)
The Maxwell–Boltzmann distribution curve in Figure 1 shows the distribution of
molecular energies in 1 mol of this gaseous reaction mixture (sample 1) at 320 K.
Figure 1
0 1 . 1 On the same axes, draw a curve for sample 1 at a lower temperature.
[2 marks]
0 1 . 2 Explain the effect that lowering the temperature would have on the rate of reaction.
[2 marks]
Barcode
, 3
0 1 . 3 A Maxwell–Boltzmann distribution curve was drawn for a second sample of the
reaction mixture in the same reaction vessel. Figure 2 shows the results.
Figure 2
Deduce the change that was made to the reaction conditions.
Explain the effect that this change has on the rate of reaction.
[3 marks]
Change
Explanation
7
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