AQA A-level CHEMISTRY Paper 2 Organic and Physical Chemistry 2020 QP.
Phosphinate ions (H2PO2
–
) react with hydroxide ions to produce hydrogen gas as
shown.
H2PO2
– + OH−
→ HPO3
2– + H2
A student completed an experiment to determine the initial rate of this reaction.
The stud...
AQA A-level CHEMISTRY Paper 2
Organic and Physical Chemistry
QP 2020.
, Please write clearly in block capitals.
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A-level
CHEMISTRY
Paper 2 Organic and Physical Chemistry
Monday 8 June 2020 Afternoon Time allowed: 2 hours
Materials
For Examiner’s Use
For this paper you must have:
• the Periodic Table/Data Booklet, 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
• If you need extra space for your answer(s), use the lined pages at the end of 8
this book. Write the question number against your answer(s).
• All working must be shown. 9
• Do all rough work in this book. Cross through any work you do not want to TOTAL
be marked.
Information
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 105.
*JUN207405201*
IB/M/Jun20/E11 7405/2
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 This question is about rates of reaction.
Phosphinate ions (H2PO2–) react with hydroxide ions to produce hydrogen gas as
shown.
H2PO2– + OH− → HPO32– + H2
A student completed an experiment to determine the initial rate of this reaction.
The student used a solution containing phosphinate ions and measured the volume of
hydrogen gas collected every 20 seconds at a constant temperature.
Figure 1 shows a graph of the student’s results.
Figure 1
0 1 . 1 Use the graph in Figure 1 to determine the initial rate of reaction for this experiment.
State its units. Show your working on the graph.
[3 marks]
Rate Units
*02*
IB/M/Jun20/7405/2
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