Please write clearly in block capitals.
AS
Centre Candidate
CHEMISTRY
number number
Paper 2 Organic and Physical
Surname
Chemistry
Forename(s)
Candidate re Time allowed: 1 hour 30 minutes
signatu
Materials
For this paper you must have: For Examiner’s Use
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 6
write outside the box around each page or on blank pages. 7
If you need extra space for your answer(s), use the lined pages at Section
the end of this book. Write the question number against your B
answer(s).
TOTAL
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 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.
*JUN227404201*
IB/M/Jun22/
E7
7404/2
, 2
Do not
write
Section A box
Answer all questions in this
section.
0 1 This question is about rates of reaction.
Potassium manganate(VII), KMnO4, reacts with sodium ethanedioate,
Na2C2O4, in the presence of dilute sulfuric acid.
2 MnO –(aq) + 16 H+(aq) + 5 C O 2–
(aq) 2 Mn2+(aq) + 8 H O(l) + 10 CO
4 2 4 2
(g)
The reaction mixture is purple at the start and goes colourless
when4 all the MnO –(aq) ions have reacted.
The rate of reaction can be measured as 1000
where t = the time taken for the
mixture
t
to go colourless.
A student investigated how long it takes for this reaction mixture to go
colourless at different temperatures. The same concentrations and
volumes of each reagent were used in an experiment at each temperature.
Table 1 shows the results.
Table 1
Temperature / C 32 38 44 54 67
Time t / s 155 85 50 22 9
1000
6.45 11. 20. 45.
t 8 0 5
0 1 .1 Complete Table
1. [1 mark]
0 1 .2 State the independent variable in this investigation.
[1 mark]
0 1 .3 The student noticed that the temperature of each reaction mixture
decreased during each experiment.
Suggest how the student calculated the temperature values in Table 1.
[1 mark]
*02
IB/M/
*
, 3
Do not
write
*02
IB/M/
*
, 4
Do not
write
0 1 .4 Use the data in Table 1 to plot a graph of 1000
against box
temperature.
t [3
marks]
0 1
.5 Use your graph in Question 01.4 to find the time taken for the mixture to go
colourless at 60 C
Show your working.
[1 mark]
s
*03
IB/M/
*
AS
Centre Candidate
CHEMISTRY
number number
Paper 2 Organic and Physical
Surname
Chemistry
Forename(s)
Candidate re Time allowed: 1 hour 30 minutes
signatu
Materials
For this paper you must have: For Examiner’s Use
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 6
write outside the box around each page or on blank pages. 7
If you need extra space for your answer(s), use the lined pages at Section
the end of this book. Write the question number against your B
answer(s).
TOTAL
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 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.
*JUN227404201*
IB/M/Jun22/
E7
7404/2
, 2
Do not
write
Section A box
Answer all questions in this
section.
0 1 This question is about rates of reaction.
Potassium manganate(VII), KMnO4, reacts with sodium ethanedioate,
Na2C2O4, in the presence of dilute sulfuric acid.
2 MnO –(aq) + 16 H+(aq) + 5 C O 2–
(aq) 2 Mn2+(aq) + 8 H O(l) + 10 CO
4 2 4 2
(g)
The reaction mixture is purple at the start and goes colourless
when4 all the MnO –(aq) ions have reacted.
The rate of reaction can be measured as 1000
where t = the time taken for the
mixture
t
to go colourless.
A student investigated how long it takes for this reaction mixture to go
colourless at different temperatures. The same concentrations and
volumes of each reagent were used in an experiment at each temperature.
Table 1 shows the results.
Table 1
Temperature / C 32 38 44 54 67
Time t / s 155 85 50 22 9
1000
6.45 11. 20. 45.
t 8 0 5
0 1 .1 Complete Table
1. [1 mark]
0 1 .2 State the independent variable in this investigation.
[1 mark]
0 1 .3 The student noticed that the temperature of each reaction mixture
decreased during each experiment.
Suggest how the student calculated the temperature values in Table 1.
[1 mark]
*02
IB/M/
*
, 3
Do not
write
*02
IB/M/
*
, 4
Do not
write
0 1 .4 Use the data in Table 1 to plot a graph of 1000
against box
temperature.
t [3
marks]
0 1
.5 Use your graph in Question 01.4 to find the time taken for the mixture to go
colourless at 60 C
Show your working.
[1 mark]
s
*03
IB/M/
*
