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2025/ 2026 A Level June 2024 OCR Chemistry A Paper 3 Including Mark Scheme 100% Verified with Correct Questions and Answers

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Access the complete A Level June 2024 OCR Chemistry A Paper 3 including mark scheme with solution, featuring 100% verified questions and answers aligned with current OCR specifications. This comprehensive study resource helps students review key chemistry concepts, understand examiner expectations, improve problem-solving skills, and maximize exam performance. Updated 2025/ 2026 materials provide valuable practice with authentic OCR A Level Chemistry assessment content to support revision and academic success

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A LEVEL JUNE 2024 OCR CHEMISTRY
A LEVEL JUNE
A PAPER
20243 OCR
INCLUDING
CHEMISTRY
A LEVEL
MARKJUNE
ASCHEME.pdf
PAPER
20243 OCR
INCLUDING
CHEMISTRY
MARKASCHEME.pdf
PAPER 3 INCLUDING MARK SCHEME.pdf

Friday 21 June 2024 – Morning
A Level Chemistry A
H432/03 Unified chemistry
Time allowed: 1 hour 30 minutes

Turn over

A LEVEL JUNE 2024 OCR CHEMISTRY
A LEVEL JUNE
A PAPER
20243 OCR
INCLUDING
CHEMISTRY
A LEVEL
MARKJUNE
ASCHEME.pdf
PAPER
20243 OCR
INCLUDING
CHEMISTRY
MARKASCHEME.pdf
PAPER 3 INCLUDING MARK SCHEME.pdf

,A LEVEL JUNE 2024 OCR CHEMISTRY
A LEVEL JUNE
A PAPER
20243 OCR
INCLUDING
CHEMISTRY
A LEVEL
MARKJUNE
ASCHEME.pdf
PAPER
20243 OCR
INCLUDING
CHEMISTRY
MARKASCHEME.pdf
PAPER 3 INCLUDING MARK SCHEME.pdf

2
1 This question is about acids, bases and salts.

(a) What is the pH of 1.00 dm3 of 0.400 mol dm–3 of NaOH(aq) at 298 K?

pH = ................... [2]

(b) Water is added to 10.0 cm3 of 0.750 mol dm–3 HCl (aq) to produce 100 cm3 of diluted HCl (aq).

What is the pH of the diluted HCl (aq)?

Give your answer to 2 decimal places.

pH = ................... [1]

(c) A solution has concentrations of 0.300 mol dm–3 CH3COOH(aq) and 0.100 mol dm–3
CH3COONa(aq).

Ka for CH3COOH = 1.75 × 10–5 mol dm–3 at 298 K.

What is the pH of the solution at 298 K?

Give your answer to 2 decimal places.

pH = ................... [2]

© OCR 2024

A LEVEL JUNE 2024 OCR CHEMISTRY
A LEVEL JUNE
A PAPER
20243 OCR
INCLUDING
CHEMISTRY
A LEVEL
MARKJUNE
ASCHEME.pdf
PAPER
20243 OCR
INCLUDING
CHEMISTRY
MARKASCHEME.pdf
PAPER 3 INCLUDING MARK SCHEME.pdf

,A LEVEL JUNE 2024 OCR CHEMISTRY
A LEVEL JUNE
A PAPER
20243 OCR
INCLUDING
CHEMISTRY
A LEVEL
MARKJUNE
ASCHEME.pdf
PAPER
20243 OCR
INCLUDING
CHEMISTRY
MARKASCHEME.pdf
PAPER 3 INCLUDING MARK SCHEME.pdf

3
(d) A student is provided with hydrated copper(II) nitrate, Cu(NO3)2•3H2O.

The student needs to prepare a standard solution of Cu(NO3)2•3H2O with a concentration of
0.200 mol dm–3. The student has access to usual laboratory apparatus and equipment.

Describe how the student would prepare 100.0 cm3 of this solution, giving quantities, apparatus
and method.

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.................................................................................................................................................... [5]

© OCR 2024 Turn over

A LEVEL JUNE 2024 OCR CHEMISTRY
A LEVEL JUNE
A PAPER
20243 OCR
INCLUDING
CHEMISTRY
A LEVEL
MARKJUNE
ASCHEME.pdf
PAPER
20243 OCR
INCLUDING
CHEMISTRY
MARKASCHEME.pdf
PAPER 3 INCLUDING MARK SCHEME.pdf

, A LEVEL JUNE 2024 OCR CHEMISTRY
A LEVEL JUNE
A PAPER
20243 OCR
INCLUDING
CHEMISTRY
A LEVEL
MARKJUNE
ASCHEME.pdf
PAPER
20243 OCR
INCLUDING
CHEMISTRY
MARKASCHEME.pdf
PAPER 3 INCLUDING MARK SCHEME.pdf

4
2 This question is about different areas of chemistry.

(a) Hydrogen gas is manufactured by the chemical industry from the reversible reaction of methane
and steam, shown below.

CH4(g) + H2O(g) 3H2(g) + CO(g) ΔH = +195 kJ mol–1

Average bond enthalpies are shown in the table.

Bond H–H O–H C≡O
Average bond enthalpy
+436 +464 +1077
/ kJ mol–1

(i) Why do all average bond enthalpies have a positive value?

..........................................................................................................................................................

..................................................................................................................................................... [1]

(ii) Determine the C–H bond enthalpy, in kJ mol–1, using the information above.

C–H bond enthalpy = ........................................... kJ mol–1 [3]

(iii) Hydrogen gas is being considered as a household fuel to replace methane.

The enthalpy change of formation, ΔfH, for H2O(l) is –285.8 kJ mol–1.

Determine the energy released when 60.0 m3 of hydrogen is used as a household fuel at RTP.

Give your answer to 3 significant figures and in standard form.

energy released = .................................................... kJ [2]

© OCR 2024

A LEVEL JUNE 2024 OCR CHEMISTRY
A LEVEL JUNE
A PAPER
20243 OCR
INCLUDING
CHEMISTRY
A LEVEL
MARKJUNE
ASCHEME.pdf
PAPER
20243 OCR
INCLUDING
CHEMISTRY
MARKASCHEME.pdf
PAPER 3 INCLUDING MARK SCHEME.pdf

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Study Level: A/AS Level
Examinator: OCR
Subject: Chemistry A
Unit: 432

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Uploaded on: June 16, 2026
Number of pages: 46
Written in: 2025/2026
Type: Exam (elaborations)
Contains: Questions & answers

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ocr chemistry a paper 3 june 2024
a level chemistry a mark scheme
ocr a level chemistry past papers
ocr chemistry exam questions and answers

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2025/ 2026 A Level June 2024 OCR Chemistry A Paper 3 Including Mark Scheme 100% Verified with Correct Questions and Answers

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