AQA A-Level Chemistry Paper 3 7405/3 June 2025 -
Official Practical Skills & Data Analysis Exam
Materials
For this paper you must have:
• a ruler with millimetre measurements
• a scientific calculator
• a pencil (HB) and an eraser
• the AQA Periodic Table (enclosed)
Instructions
• Answer all questions.
• Show all your working.
• Use black ink or black ball-point pen.
• Do not write outside the box around each page or on blank pages.
• 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.
, • You are expected to answer graph-plotting and numerical questions without the aid of
spreadsheet software.
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Section A – Practical Techniques & Set-Up
Answer ALL questions in this section.
0 1 This question is about the AQA Required Practical "Measurement of the molar
volume of a gas".
0 1 . 1 Describe how you would safely generate and collect a dry sample of carbon
dioxide from the reaction between 0.30 g of calcium carbonate and excess 2.0 mol
dm⁻³ hydrochloric acid. Include a labelled diagram of the apparatus. [4 marks]
0 1 . 2 The volume of gas collected at 24 °C and 1.02 × 10⁵ Pa was 68 cm³.
(i) Calculate the amount (in mol) of CO₂ produced.
(ii) Hence determine the experimental molar volume of gas under these conditions and
calculate its percentage deviation from the ideal value at 24 °C (24.0 dm³ mol⁻¹). [4
marks]
0 1 . 3 Identify two significant sources of error in this experiment and for each suggest
an improvement that would reduce the associated uncertainty. [4 marks]
0 2 This question is about enthalpy change determinations.
0 2 . 1 In a calorimetry experiment 25.0 cm³ of 1.00 mol dm⁻³ HCl was mixed with 25.0
cm³ of 1.00 mol dm⁻³ NaOH. The temperature rose by 6.8 °C.
Official Practical Skills & Data Analysis Exam
Materials
For this paper you must have:
• a ruler with millimetre measurements
• a scientific calculator
• a pencil (HB) and an eraser
• the AQA Periodic Table (enclosed)
Instructions
• Answer all questions.
• Show all your working.
• Use black ink or black ball-point pen.
• Do not write outside the box around each page or on blank pages.
• 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.
, • You are expected to answer graph-plotting and numerical questions without the aid of
spreadsheet software.
–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
–––––––––––––––––––
Section A – Practical Techniques & Set-Up
Answer ALL questions in this section.
0 1 This question is about the AQA Required Practical "Measurement of the molar
volume of a gas".
0 1 . 1 Describe how you would safely generate and collect a dry sample of carbon
dioxide from the reaction between 0.30 g of calcium carbonate and excess 2.0 mol
dm⁻³ hydrochloric acid. Include a labelled diagram of the apparatus. [4 marks]
0 1 . 2 The volume of gas collected at 24 °C and 1.02 × 10⁵ Pa was 68 cm³.
(i) Calculate the amount (in mol) of CO₂ produced.
(ii) Hence determine the experimental molar volume of gas under these conditions and
calculate its percentage deviation from the ideal value at 24 °C (24.0 dm³ mol⁻¹). [4
marks]
0 1 . 3 Identify two significant sources of error in this experiment and for each suggest
an improvement that would reduce the associated uncertainty. [4 marks]
0 2 This question is about enthalpy change determinations.
0 2 . 1 In a calorimetry experiment 25.0 cm³ of 1.00 mol dm⁻³ HCl was mixed with 25.0
cm³ of 1.00 mol dm⁻³ NaOH. The temperature rose by 6.8 °C.
