Exam (elaborations)
aqa as level chemistry paper 2
- Course
- Institution
aqa as level chemistry paper 2
[Show more]
Seller
Follow
chadduncan057
Reviews received
Content preview
Please write clearly in block capitals.Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
1
AS
ar
CHEMISTRY
Paper 2 Organic and Physical Chemistry ah
am
Time allowed: 1 hour 30 minutes
al
Materials For Examiner’s Use
hn
For this paper you must have:
• the Periodic Table/Data Sheet, provided as an insert (enclosed) Question Mark
• a ruler with millimetre measurements 1
is
• a scientific calculator, which you are expected to use where appropriate.
2
Instructions
kr
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
• If you need extra space for your answer(s), use the lined pages at the end of Section B
this book. Write the question number against your answer(s).
• All working must be shown. TOTAL
• 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
outside the
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 MnO4–(aq) + 16 H+(aq) + 5 C2O42–(aq) → 2 Mn2+(aq) + 8 H2O(l) + 10 CO2(g)
The reaction mixture is purple at the start and goes colourless when all the
MnO4–(aq) ions have reacted.
1000
The rate of reaction can be measured as where t = the time taken for the mixture
t
1
to go colourless.
ar
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
ah
used in an experiment at each temperature. Table 1 shows the results.
Table 1
am
Temperature / C 32 38 44 54 67
Time t / s 155 85 50 22 9
al
1000
6.45 11.8 20.0 45.5
t
hn
0 1 . 1 Complete Table 1.
is
[1 mark]
kr
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/Jun22/7404/2
, 3
Do not write
outside the
1000 box
0 1 . 4 Use the data in Table 1 to plot a graph of against temperature.
t
[3 marks]
1
ar
ah
am
al
hn
is
kr
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]
Time t s
Turn over ►
*03*
IB/M/Jun22/7404/2
, 4
Do not write
outside the
0 1 . 6 The investigation shows that increasing the temperature causes the rate of reaction to box
increase.
Explain why a small increase in temperature causes a large increase in the rate of
reaction.
[2 marks]
1
9
ar
ah
am
al
hn
is
kr
@
*04*
IB/M/Jun22/7404/2
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller chadduncan057. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $3.86. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
53068 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now