Question paper (A-level) : Paper 3 - June 2019 - MME
Please write clearly in block capitals.
Centre number
Surname Forename(s) Candidate signature
A-level CHEMISTRY
Paper 3
Candidate number
Wednesday 19 June 2019 Morning
Time allowed: 2 hours
Materials For this paper you must have: ? the Periodic Table/Data Sheet, provided as an insert (enclosed) ? a ruler with millimetre measurements ? a scientific calculator, which you are expected to use where appropriate.
Instructions ? Use black ink or black ball-point pen. ? Fill in the boxes at the top of this page. ? Answer all questions. ? You must answer the questions in the spaces provided. Do not write outside
the box around each page or on blank pages. ? 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 90.
For Examiner's Use
Question 1 2 3 4 5
Section B TOTAL
Mark
Advice ? You are advised to spend about 70 minutes on Section A and 50 minutes on Section B.
*JUN197405301*
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7405/3
2
Section A Answer all questions in this section.
Do not write outside the
box
0 1
Sodium thiosulfate reacts with dilute hydrochloric acid as shown.
Na2S2O3(aq) + 2 HCl(aq) 2 NaCl(aq) + SO2(g) + S(s) + H2O(l)
0 1 . 1 Give the simplest ionic equation for this reaction.
[1 mark]
0 1 . 2 The gas SO2 is a pollutant. State the property of SO2 that causes pollution when it enters rivers. Give an equation to show the reaction of SO2 with water.
Property
[2 marks]
Equation
*02*
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3
0 1 . 3 Draw a diagram to show the shape of a molecule of H2O Include any lone pairs of electrons. State the H-O-H bond angle. Explain this shape and bond angle.
Diagram
Do not write outside the
box
[4 marks]
Bond angle Explanation
Question 1 continues on the next page
*03*
Turn over
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4
0 1.4
The initial rate of the reaction between sodium thiosulfate and hydrochloric acid can be monitored by measuring the time taken for a fixed amount of sulfur to be produced.
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box
Describe an experiment to investigate the effect of temperature on the initial rate of this reaction.
Include
? a brief outline of your method ? how you will measure the time taken for a fixed amount of sulfur to be formed ? how you will present your results in graphical form ? a sketch of the graph that you would expect.
[6 marks]
*04*
IB/G/Jun19/7405/3
5
Do not write outside the
box
*05*
13 Turn over
IB/G/Jun19/7405/3
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