How A Level Chemistry is Assessed: Cambridge 9701 vs. Edexcel IAL, Organic Chemistry and Practicals are the Biggest Challenges

The two main versions of A-Level Chemistry are Cambridge International 9701 and Edexcel IAL Chemistry. Just like in A-Level Physics, the biggest difference between the two lies in the practicals: For Cambridge, Paper 3 requires lab work for qualitative analysis and titrations, whereas Edexcel's practical units are written exams. Additionally, organic chemistry carries significant weight and is a key area for students from China to focus on.

Based on the official syllabuses from both exam boards, this article breaks down what is tested and how to prepare. For the overall rules on achieving an A* in A-Level, see How to Get an A* in A-Level; for exam seasons and registration, see How to Plan A-Level Exam Seasons and Registration.

I. Cambridge International 9701: Five Papers

What to Expect in Paper 3

Paper 3 is a practical exam taken in the lab, consisting of 2–3 questions worth 40 marks:

• One qualitative analysis question: Perform specified experiments on unknown substances, record observations, analyze results, and draw conclusions; the exam paper includes Qualitative analysis notes;
• The remaining questions are quantitative: Titrations, or measuring time, temperature, mass, gas volume, etc.; requires creating tables or graphs, processing data, performing calculations, and drawing conclusions;
• You may be asked to evaluate the accuracy of the experiment, identify sources of error, and suggest improvements.

The three routes are the same as in Physics: taking only AS; completing A Level over two years; or taking all five papers at once. Assessment objectives: Knowledge and understanding 40%, Handling, application, and evaluation of information 40%, Experimental skills 20%.

Content

AS (22 topics) is divided into four areas:

• Physical chemistry: Atomic structure, atoms, molecules, and stoichiometry, chemical bonding, states of matter, chemical energetics, electrochemistry, equilibria, reaction kinetics;
• Inorganic chemistry: Periodicity, Group 2, Group 17, nitrogen and sulfur;
• Organic chemistry: Introduction to organic chemistry, hydrocarbons, halogenated compounds, hydroxy compounds, carbonyl compounds, carboxylic acids and derivatives, nitrogenous compounds, polymerization, organic synthesis;
• Analysis: Analytical techniques.

A Level additions (topics 23–37): Physical chemistry (advanced chemical energetics, electrochemistry, equilibria, reaction kinetics), Inorganic chemistry (Group 2, transition elements), Organic chemistry (A Level introduction to organic chemistry, hydrocarbons, halogenated compounds, hydroxy compounds, carboxylic acids and derivatives, nitrogenous compounds, polymerization, organic synthesis), Analytical techniques.

The new syllabus for 2028–2030 was released in September 2025, with the official statement noting no significant changes affecting teaching.

II. Edexcel IAL Chemistry: Six Units

• Units 3 and 6 are written exams testing understanding of practical procedures and techniques, applied in both familiar and unfamiliar contexts;
• The syllabus includes 16 core practicals;
• At least 20% of the overall marks assess Level 2 or above mathematical skills; some papers require the use of the Data Booklet provided with the syllabus;
• Calculators are allowed; units like Unit 3 are available in January, June, and October.

III. How to Prepare

Here are some practical tips based on experience.

1. Organic Chemistry: High Weight, Needs Systematization

Both Cambridge AS and A Level feature extensive organic topics, and the names of all four Edexcel theory units include organic content. Create a functional group transformation map: what each functional group can be derived from, what it can be converted into, the reaction conditions and reagents, and the reaction mechanisms (nucleophilic substitution, electrophilic addition, etc.). This map is key to tackling organic synthesis questions.

2. Practical Work: Prepare According to the Exam Board

• Cambridge: Paper 3 requires hands-on practice: titration techniques and readings, recording observations for qualitative analysis (color, precipitates, gases), graphing and calculations, and error analysis. Private candidates should confirm with the exam center that practical exams can be arranged before registering;
• Edexcel: Thoroughly master each of the 16 core practicals: reagents, procedures, observations, calculations, errors, and improvements.

3. Physical Chemistry: Standardize Your Calculations

For calculations involving stoichiometry, energetics (Hess's Law, bond energies, Born-Haber cycles), equilibrium constants, electrode potentials, and rate equations, always write out the formula, substitute the values, and include units and significant figures.

4. English Terminology and Descriptive Answers

Many questions require you to describe observations or explain reasons in English, such as "explain why the boiling point increases down the group". Ensure your answer covers all key points and uses accurate terminology: electronegativity, intermolecular forces, nucleophile, electrophile, ligand, oxidation state, etc.

5. Practice with Official Materials

Practice with past papers and mark schemes, paying special attention to the scoring points for "describe" and "explain" questions in the mark schemes.

Final Thoughts

The two toughest challenges in A-Level Chemistry are organic chemistry and practical work: systematize organic chemistry using a transformation map, and prepare for practicals according to the exam board (hands-on for Cambridge, mastering core practicals for Edexcel). Combined with standardized calculations and accurate English descriptions, achieving an A* is entirely within reach.

For other A-Level subjects, see How to Prepare for A-Level Physics and How to Prepare for A-Level Mathematics. If you need A-Level Chemistry tutoring, feel free to chat with our teachers.

Verification note: This article was verified against the official syllabuses in September 2026. The five papers, time, marks, and weightings for Cambridge 9701, the question structure and qualitative analysis notes for Paper 3, the three exam routes, assessment objective weightings, and topics are from the Cambridge International AS & A Level Chemistry 9701 syllabus for 2025, 2026 and 2027; the statement that the 2028–2030 syllabus has "no significant changes affecting teaching" is from the 2028–2030 syllabus; the six units, time, marks, weightings, the fact that practical units are written exams, the 16 core practicals, mathematical requirements, Data Booklet, calculators, and exam sessions for Edexcel IAL Chemistry are from the Pearson Edexcel International A Level Chemistry Specification. The preparation tips are based on our practical experience.

References:

• Cambridge International：Chemistry 9701 Syllabus 2025–2027（PDF）
• Cambridge International：Chemistry 9701 Syllabus 2028–2030（PDF）
• Pearson Edexcel：International A Level Chemistry Specification（PDF）