Exam (elaborations)
A-Level June 2022 Chemistry Paper 3 General and Practical Principles in Chemistry
- Module
- A/AS LEVEL
- Institution
- PEARSON (PEARSON)
A-Level June 2022 Chemistry Paper 3 General and Practical Principles in Chemistry
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Candidate surname Other names
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Centre Number Candidate Number
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Pearson Edexcel Level 3 GCE
Paper
Time 2 hours 30 minutes
reference 9CH0/03
Chemistry
Advanced
PAPER 3: General and Practical Principles in Chemistry
You must have: Total Marks
Scientific calculator, Data Booklet, ruler
Instructions
• Fill
Use black ink or ball-point pen.
• centrein the boxes at the top of this page with your name,
number and candidate number.
• Answer all questions.
• Answer the questions in the spaces provided
– there may be more space than you need.
Information
• The total mark for this paper is 120.
• The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
• abilitythetoquestion
For marked with an asterisk (*), marks will be awarded for your
structure your answer logically showing the points that you make are
related or follow on from each other where appropriate.
• A Periodic Table is printed on the back cover of this paper.
Advice
• Read each question carefully before you start to answer it.
• Show all your working in calculations and include units where appropriate.
• Check your answers if you have time at the end.
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BLANK PAGE
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Answer ALL questions.
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Write your answers in the spaces provided.
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1 Relative atomic mass is an important concept in chemistry.
(a) Define the term relative atomic mass.
(2)
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(b) A sample of neon consisted of three isotopes.
Isotope Percentage abundance
20
Ne 84.80
21
Ne 2.26
22
Ne 12.94
Calculate the relative atomic mass of neon in this sample.
Give your answer to three significant figures.
(2)
(Total for Question 1 = 4 marks)
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2 Ammonium cobalt(II) sulfate is made by mixing aqueous solutions of
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ammonium sulfate and excess cobalt(II) sulfate.
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(a) Dry crystals of ammonium cobalt(II) sulfate, (NH4)2SO4·CoSO4·6H2O, are obtained
by the procedure shown.
Step 1 The reaction mixture is transferred to an evaporating basin, heated
gently and then left to crystallise.
Step 2 The crystals are separated by gravity filtration.
Step 3 The crystals are then rinsed with a small amount of ice‑cold water.
Step 4 The rinsed crystals are placed in a warm oven for 30 minutes.
(i) The colour of the cobalt(II) sulfate solution used is pink due to the complex
cobalt(II) ion, [Co(H2O)6]2+.
Explain why the solution is coloured.
(4)
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(ii) Explain the shape of the cobalt(II) ion, [Co(H2O)6]2+ , using electron-pair repulsion theory.
(3)
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