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2024_OCR: A Level Chemistry A H432/03 Unified Chemistry (Merged Question Paper & Marking Scheme)
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2024_OCR: A Level Chemistry A H432/03 Unified Chemistry (Merged Question Paper & Marking Scheme) Key Areas to Revise: 1. Thermodynamics o Enthalpy Changes: Understand exothermic and endothermic reactions, Hess's Law, and how to calculate enthalpy changes. o Gibbs Free Energy: Learn how...

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  • March 4, 2025
  • 50
  • 2024/2025
  • Exam (elaborations)
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  • 2024ocr a level chemistry a h43203 unified chem

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  • 2024_OCR: A Level Chemistry A H432/03
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2024_OCR: A Level Chemistry A H432/03 Unified Chemistry
(Merged Question Paper & Marking Scheme)

Key Areas to Revise:

1. Thermodynamics
o Enthalpy Changes: Understand exothermic and endothermic reactions, Hess's Law, and
how to calculate enthalpy changes.
o Gibbs Free Energy: Learn how to calculate Gibbs free energy (ΔG) and predict
spontaneity based on ΔH and ΔS.
2. Kinetics
o Reaction Rates: Study factors affecting reaction rates (temperature, concentration,
catalysts).
o Rate Equations: Understand how to determine reaction orders and derive rate equations.
3. Chemical Equilibria
o Dynamic Equilibrium: Learn Le Chatelier’s principle and how to shift equilibria with
changes in concentration, temperature, or pressure.
o Equilibrium Constant (Kc): Calculate and interpret equilibrium constants.
4. Acids and Bases
o Bronsted-Lowry Theory: Review acids and bases as proton donors and acceptors.
o pH and Strong/Weak Acids: Calculate pH for strong and weak acids and bases.
o Buffer Solutions: Understand and calculate the pH of buffer solutions.
5. Electrochemistry
o Redox Reactions: Study oxidation and reduction, and calculate cell potentials.
o Electrochemical Cells: Understand galvanic and electrolytic cells, and use the Nernst
equation.
6. Periodic Table and Group Trends
o Group 2 and Group 7 Elements: Study trends in reactivity, structure, and properties of
alkali and halogen elements.
o Transition Metals: Review their properties, complex formation, and catalytic activity.
7. Organic Chemistry
o Functional Groups: Learn about key organic functional groups (e.g., alcohols, carboxylic
acids, alkenes).
o Reaction Mechanisms: Understand electrophilic addition, nucleophilic substitution, and
elimination reactions.
o Synthesis: Study methods for synthesizing organic compounds and interconversions of
functional groups.
8. Physical Chemistry and the Structure of Matter
o Atomic Structure: Review subatomic particles, isotopes, and electron configuration.
o Bonding: Understand ionic, covalent, and metallic bonding, and intermolecular forces.
o Lattice Enthalpy: Study lattice enthalpy and factors affecting it in ionic compounds.

, Oxford Cambridge and RSA


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

You must have:
*1349593883*




• the Data Sheet for Chemistry A
You can use:
• a scientific or graphical calculator
• an HB pencil




Please write clearly in black ink. Do not write in the barcodes.

Centre number Candidate number


First name(s)

Last name


INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs and diagrams.
• Write your answer to each question in the space provided. If you need extra space use
the lined pages at the end of this booklet. The question numbers must be clearly shown.
• Answer all the questions.
• Where appropriate, your answer should be supported with working. Marks might be
given for using a correct method, even if your answer is wrong.

INFORMATION
• The total mark for this paper is 70.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an asterisk (*).
• This document has 20 pages.

ADVICE
• Read each question carefully before you start your answer.




© OCR 2024 [601/5255/2] OCR is an exempt Charity
DC (PQ/SW) 331429/6 Turn over

, 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

, 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

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