Please write clearly in block capitals.
Centre number Candidate number
Surname
Your text here 1
Forename(s)
Candidate signature
AS
CHEMISTRY
Paper 2 Organic and Physical Chemistry
Friday 25 May 2018 Morning Time allowed: 1 hour 30 minutes
Materials For Examiner’s Use
For this paper you must have:
• the Periodic Table/Data Sheet, provided as an insert (enclosed) Question Mark
• a ruler with millimetre measurements 1
• a scientific calculator, which you are expected to use where appropriate.
2
Instructions 3
• Use black ink or black ball-point pen. 4
• Fill in the boxes at the top of this page.
5
• Answer all questions.
• You must answer the questions in the spaces provided. Do not write outside 6
the box around each page or on blank pages. 7
• All working must be shown.
8
• Do all rough work in this book. Cross through any work you do not want to be
marked. Section B
TOTAL
Information
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 80.
Advice
• You are advised to spend about 65 minutes on Section A and 25 minutes on Section B.
*jun187404201*
IB/M/Jun18/E6 7404/2
, 2 Do not write
outside the
box
Section A
Answer all questions in this section.
0 1 Hydrogen peroxide solution decomposes slowly to form water and oxygen.
The reaction is much faster in the presence of a manganese(IV) oxide catalyst.
2H2O2(aq) ⟶ 2H2O(l) + O2(g)
Three experiments, shown in Table 1, were carried out to investigate how the volume
of oxygen produced varied over time under different conditions. The same mass of
catalyst was used in each experiment.
Table 1
Concentration Volume of
Temperature
Experiment of H2O2(aq) H2O2(aq) Catalyst
/ C
/ mol dm–3 / cm3
1 1.0 50 20 lumps
2 1.0 50 20 powder
3 0.5 50 20 lumps
Figure 1 shows how the volume of oxygen collected varied with time in
Experiment 1.
Figure 1
*02*
IB/M/Jun18/7404/2
, Do not write
3 outside the
box
0 1 . 1 Explain, in general terms, how a catalyst increases the rate of a reaction.
[2 marks]
0 1 . 2 Draw two lines on Figure 1 to show how the volume of oxygen collected varied with
time in Experiments 2 and 3.
Label each line with the experiment number.
[2 marks]
0 1 . 3 Explain, in terms of collision theory, the effect of increasing the concentration of
hydrogen peroxide on the rate of reaction.
[2 marks]
6
Turn over ►
*03*
IB/M/Jun18/7404/2
Centre number Candidate number
Surname
Your text here 1
Forename(s)
Candidate signature
AS
CHEMISTRY
Paper 2 Organic and Physical Chemistry
Friday 25 May 2018 Morning Time allowed: 1 hour 30 minutes
Materials For Examiner’s Use
For this paper you must have:
• the Periodic Table/Data Sheet, provided as an insert (enclosed) Question Mark
• a ruler with millimetre measurements 1
• a scientific calculator, which you are expected to use where appropriate.
2
Instructions 3
• Use black ink or black ball-point pen. 4
• Fill in the boxes at the top of this page.
5
• Answer all questions.
• You must answer the questions in the spaces provided. Do not write outside 6
the box around each page or on blank pages. 7
• All working must be shown.
8
• Do all rough work in this book. Cross through any work you do not want to be
marked. Section B
TOTAL
Information
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 80.
Advice
• You are advised to spend about 65 minutes on Section A and 25 minutes on Section B.
*jun187404201*
IB/M/Jun18/E6 7404/2
, 2 Do not write
outside the
box
Section A
Answer all questions in this section.
0 1 Hydrogen peroxide solution decomposes slowly to form water and oxygen.
The reaction is much faster in the presence of a manganese(IV) oxide catalyst.
2H2O2(aq) ⟶ 2H2O(l) + O2(g)
Three experiments, shown in Table 1, were carried out to investigate how the volume
of oxygen produced varied over time under different conditions. The same mass of
catalyst was used in each experiment.
Table 1
Concentration Volume of
Temperature
Experiment of H2O2(aq) H2O2(aq) Catalyst
/ C
/ mol dm–3 / cm3
1 1.0 50 20 lumps
2 1.0 50 20 powder
3 0.5 50 20 lumps
Figure 1 shows how the volume of oxygen collected varied with time in
Experiment 1.
Figure 1
*02*
IB/M/Jun18/7404/2
, Do not write
3 outside the
box
0 1 . 1 Explain, in general terms, how a catalyst increases the rate of a reaction.
[2 marks]
0 1 . 2 Draw two lines on Figure 1 to show how the volume of oxygen collected varied with
time in Experiments 2 and 3.
Label each line with the experiment number.
[2 marks]
0 1 . 3 Explain, in terms of collision theory, the effect of increasing the concentration of
hydrogen peroxide on the rate of reaction.
[2 marks]
6
Turn over ►
*03*
IB/M/Jun18/7404/2
