AQA GCSE Chemistry Higher Tier Paper 2 2025 | Exam & Mark Scheme

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I declare this is my own work.

GCSE
CHEMISTRY
Higher Tier N Paper 2 N
H
Friday 13 June 2025 N N N Morning Time allowed: 1 hour 45 minutes
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Materials ForNExaminer’sNUse
For this paper you must have:
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 a ruler
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 a scientific calculator
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 the periodic table (enclosed).
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Instructions 3
 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. Do not write outside
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the box around each page or on blank pages.
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 If you need extra space for your answer(s), use the lined pages at the end of
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this book. 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
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to be marked.
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Information
 The maximum mark for this paper is 100.
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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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 In all calculations, show clearly how you work out your answer.
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 You are reminded of the need for good English and clear presentation
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in your answers.
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IB/G/Jun25/G4007/E10 8462/2H

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0 1 N A student investigated the mass of dissolved solids in sea water.
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N This is the method used.
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1. Weigh an empty evaporating basin.
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2. Measure 10.0 cm3 of sea water sample A into the evaporating basin
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using a burette. N N



3. Heat the evaporating basin until all the water seems to have evaporated.
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4. Weigh the evaporating basin and contents.
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5. Calculate the mass of dissolved solids in the sample.
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6. Repeat steps 1 to 5 with sea water samples B, C and D.
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0 1 . 1 Why did the student use a burette rather than a measuring cylinder to measure
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10.0 cm3 of each sample?
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[1 mark] N




0 1 . 2 What was the dependent variable in this investigation?
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[1 mark]
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0 1 . 3 Describe how the student could make sure all of the water had evaporated in step 3.
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0 1 . 4 How did the student calculate the mass of dissolved solids in each sea water sample?
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[1 mark] N




IB/G/Jun25/8462/2H

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Table 1 shows the results.
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Table 1 N




Sea water sample
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Mass of dissolved solids in grams
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0 1 . 5 Calculate the mean concentration of dissolved solids in 10.0 cm3 samples of se
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a water A, B, C and D.
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Use Table 1 and the equation:
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mean mass of dissolved solids (g)
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mean concentration of dissolved solids (g/dm3) =
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volume of sample (dm3)
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3
Give your answer in g/dm .
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[5 marks]
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Mean concentration = ________________ g/dm3
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0 1 . 6 Suggest why sea water samples A, B, C and D contain different masses
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of dissolved solids.
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[1 mark]
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Turn over ► N N




IB/G/Jun25/8462/2H

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0 2 This question is about hydrocarbon fuels.
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Figure 1 represents the process used to separate hydrocarbon fuels from crude oil.
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Figure 1 N




0 2 . 1 Name the process represented by Figure 1.
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[1 mark]
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0 2 . 2 Changes of state take place during the process in Figure 1.
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Name the change of state taking place in:
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 the heater N




 the column. N



[2 marks]
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Heater N




N Column N




IB/G/Jun25/8462/2H