AQA GCSE Combined Science Trilogy Chemistry Paper 1F | Mark Scheme 2025

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Centre number b Candidate number b




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I declare this is my own work.
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GCSE
COMBINEDSCIENCE:TRILOGY
Foundation Tier Chemistry b b
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b F
Paper1F b




Monday 19 May 2025 b b b Morning Timeallowed: 1hour15minutes
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Materials For Examiner’s Use
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For this paper you must have:
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Question Mark
 a ruler
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 a scientific calculator
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 the periodic table (enclosed).
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Instructions
 Use black ink or black ball-point pen.
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 Pencil should only be used for drawing.
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 Fill in the boxes at the top of this page.
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 Answer all questions in the spaces provided.
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 If you need extra space for your answer(s), use the lined pages at the end of this b
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ook. Write the question number against your answer(s).
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 Do all rough work in this book. Cross through any work you do not want to be marke
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d.
 In all calculations, show clearly how you work out your answer.
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Information
 The maximum mark for this paper is 70.
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 The marks for questions are shown in brackets.
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 You are expected to use a calculator where appropriate.
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 You are reminded of the need for good English and clear presentation in your answers.
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IB/M/Jun25/G4007/E9 8464/C/1F

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0 1 This question is about atoms and ions.
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The model of the atom has changed over time.
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0 1 . 1 In an early model, scientists thought the atom was a tiny sphere that could not
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be divided. b




Figure 1 represents this early model of the atom.
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Figure 1 b




The discovery of a subatomic particle led to a change in the model in Figure 1.
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Which was the first subatomic particle to be discovered? Tic
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[1 mark]
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k () one box.
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Electron


Neutron


Proton




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0 1 . 2 In a later model of the atom, most of the mass was concentrated in the centr
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e of the atom.
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What is the name of the centre of an atom?
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[1 mark]
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0 1 . 3 Atoms contain three types of subatomic particle.
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Draw one line from each subatomic particle to the relative charge of the particle.
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[2 marks]
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0 1 . 4 What is meant by the ‘atomic number of an atom’? Tick (
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) one box.
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The number of neutrons only
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The number of protons only
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The number of neutrons + the number of protons
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Question 1 continues on the next page
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Turn over ► b b




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0 1 . 5 Table 1 shows information about two isotopes of an element.
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Table 1 b




Percentage (%)
Mass number
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abundance
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Isotope A b 10 19.7

Isotope B b 11 80.3




Calculate the relative atomic mass (Ar) of the element. Use th
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e equation:
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(mass number × percentage) of isotope A + (mass number × percentage) of isotope B
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Ar =
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100


Give your answer to 1 decimal place.
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[3 marks]
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Ar (1 decimal place) =
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IB/M/Jun25/8464/C/1F