AQA A-level CHEMISTRY Paper 2 Organic and Physical Chemistry Monday 8 June 2023

2
Do not write
outside the

AQA A-level CHEMISTRY
Paper 2 Organic and Physical Chemistry
Monday 8 June
2023



A-level
CHEMISTRY
Paper 2 Organic and Physical Chemistry
Answer all questions in the spaces provided. box




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, 3
Do not write
outside the




0 1 This question is about rates of reaction.

Phosphinate ions (H2PO2–) react with hydroxide ions to produce hydrogen gas as
shown.

H2PO – + OH
2
−
→ HPO2– + H3 2


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 ofhydrogen 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]




0 1 . 2 Another student reacted different initial concentrations of phosphinate ions with an
excess of hydroxide ions. The student measured the time (t) taken to collect
15 cm3 of hydrogen gas. Each experiment was carried out at the same temperature.
Table 1 shows the results.

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, 4
Do not write
outside the
ip between the initial concentration of phosphinate and time (t). box



Deduce the order of the reaction with respect to phosphinate.
[2 marks]

Relationship

Order



Question 1 continues on the next page




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