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Cambridge AS and A Level Chemistry Syllabus 2025, Key Changes, Assessment Overview, Download PDF!

Cambridge AS and A Level Chemistry syllabus for 2025 covers physical, inorganic, and organic chemistry, with advanced practical skills. It's an important document for organized preparation and exam success. Download the official PDF here.

Swati Shakya11 Dec, 2024

Cambridge AS and A Level Chemistry syllabus 2025 is a detailed document that outlines all the essential topics, practical skills, and assessment details required for success in the exams. With the next set of exams scheduled for 2025, this syllabus is a must-have resource for students preparing for one of the most challenging and rewarding courses.

It covers topics in physical, inorganic, and organic chemistry, along with advanced practical skills, ensuring students are fully equipped for the theoretical and experimental aspects of the subject. By using the syllabus, students can stay organized, focus on high-priority topics, and align their preparation with Cambridge's requirements. Download the Cambridge AS and A Level syllabus today and set yourself up for exam success in 2025.

Cambridge AS and A Level Chemistry Syllabus 2025 Overview

Explore the complete AS and A level chemistry syllabus overview, covering physical, inorganic, and organic chemistry, along with practical skills. Detailed information is provided below for your reference.

Cambridge AS and A Level Chemistry Syllabus Overview
AS Level Subject Content	A Level Subject Content
Physical Chemistry	Physical Chemistry
1. Atomic structure	23. Chemical energetics
2. Atoms, molecules and stoichiometry	24. Electrochemistry
3. Chemical bonding	25. Equilibria
4. States of matter	26. Reaction kinetics
5. Chemical energetics
6. Electrochemistry	Inorganic Chemistry
7. Equilibria	27. Group 2
8. Reaction kinetics	28. Chemistry of transition elements

Inorganic Chemistry	Organic Chemistry
9. The Periodic Table: chemical periodicity	29. An introduction to A Level organic chemistry
10. Group 2	30. Hydrocarbons
11. Group 17	31. Halogen compounds
12. Nitrogen and sulfur	32. Hydroxy compounds
	33. Carboxylic acids and derivatives
Organic Chemistry	34. Nitrogen compounds
13. An introduction to AS Level organic chemistry	35. Polymerisation
14. Hydrocarbons	36. Organic synthesis
15. Halogen compounds
16. Hydroxy compounds	Analysis
17. Carbonyl compounds	37. Analytical techniques
18. Carboxylic acids and derivatives
19. Nitrogen compounds
20. Polymerisation
21. Organic synthesis
	Practical Skills
Analysis	A Level candidates also study practical skills.
22. Analytical techniques

Practical Skills
AS Level candidates also study practical skills.

Key Changes in Cambridge AS and A Level Chemistry Old and New Syllabus

Understand the important updates in the new syllabus compared to the old one. Detailed changes are outlined below to help you prepare effectively.

Key Changes in Cambridge AS and A Level Chemistry Old and New Syllabus
Subtopic	Old Syllabus	New Syllabus	Key Changes
15.1(c)	Substitution of an alcohol, e.g. by reaction with HX or KBr with H₂SO₄ or H₃PO₄; or with PCl₃ and heat, or with PCl₅, or with SOCl₂	Substitution of an alcohol, e.g. by reaction with HX(g); or with KCl and concentrated H₂SO₄ or concentrated H₃PO₄; or with PCl₃ and heat, or with PCl₅, or with SOCl₂	- HX now specified as HX(g). - KBr with H₂SO₄ or H₃PO₄ replaced by KCl and concentrated H₂SO₄ or H₃PO₄.
16.2(b)	Substitution to halogenoalkanes, e.g. by reaction with HX or KBr with H₂SO₄ or H₃PO₄; or with PCl₃ and heat, or with PCl₅, or with SOCl₂	Substitution to form halogenoalkanes, e.g. by reaction with HX(g); or with KCl and concentrated H₂SO₄ or concentrated H₃PO₄; or with PCl₃ and heat, or with PCl₅, or with SOCl₂	- HX now specified as HX(g). - KBr with H₂SO₄ or H₃PO₄ replaced by KCl and concentrated H₂SO₄ or H₃PO₄.

Important Notes:

HX is clarified as HX(g) , explicitly indicating its gaseous form.
Use of KBr with H₂SO₄ or H₃PO₄ has been replaced by KCl and concentrated H₂SO₄ or concentrated H₃PO₄ .

What Are Cambridge Grade Thresholds

Cambridge AS and A Level Chemistry Syllabus 2025 - Assessment Overview

Learn about the assessment structure, including paper details, weightage, and question types. A detailed breakdown is provided below for better understanding.

Cambridge AS and A Level Chemistry Syllabus - Assessment Overview
Paper	Title	Duration	Marks	Description	Weightage
Paper 1	Multiple Choice	1 hour 15 minutes	40	40 multiple-choice questions based on AS Level syllabus content. Externally assessed.	31% of AS Level 15.5% of A Level
Paper 2	AS Level Structured Questions	1 hour 15 minutes	60	Structured questions based on AS Level syllabus content. Externally assessed.	46% of AS Level 23% of A Level
Paper 3	Advanced Practical Skills	2 hours	40	Practical work and structured questions based on experimental skills in the Practical assessment section of the syllabus. Externally assessed.	23% of AS Level 11.5% of A Level
Paper 4	A Level Structured Questions	2 hours	100	Structured questions based on A Level syllabus content (includes knowledge of material from AS Level syllabus). Externally assessed.	38.5% of A Level
Paper 5	Planning, Analysis and Evaluation	1 hour 15 minutes	30	Questions based on experimental skills (planning, analysis, and evaluation). Context may be outside the syllabus content. Externally assessed.	11.5% of A Level

Cambridge AS and A Level Chemistry Syllabus 2025 Official PDF

The Cambridge AS and A Level Chemistry syllabus provides detailed information about the course structure, topics, and assessment format. It helps students understand what to expect in their exams and guides teachers in planning lessons effectively. From physical and organic chemistry to practical skills, this syllabus covers everything required for success. Download the official PDF using the link below to access the complete syllabus and ensure you're well-prepared.

Preparation Tips for Cambridge AS and A Level Chemistry Syllabus 2025

1. Paper 1: Multiple Choice

This paper tests your foundational knowledge of AS Level Chemistry through 40 multiple-choice questions.

Revise the AS syllabus thoroughly, especially topics like atomic structure, chemical bonding, and reaction kinetics.
Practice quick calculations for stoichiometry and energetics.
Solve multiple-choice questions from past papers to improve accuracy and time management.

2. Paper 2: AS Level Structured Questions

This paper contains structured questions based on the AS syllabus.

Practice writing detailed answers for concepts like periodicity, enthalpy, and reaction kinetics.
Focus on presenting calculations step by step, as partial marks are awarded.
Understand experimental techniques, as some questions may test practical applications.

3. Paper 3: Advanced Practical Skills

This paper tests practical skills through structured questions and experimental analysis.

Familiarize yourself with experimental setups like titrations, qualitative analysis, and chromatography.
Practice identifying sources of error and explaining improvements for experiments.
Review common calculations, such as percentage yield and molarity.

4. Paper 4: A Level Structured Questions

This paper tests A Level concepts in depth, with a mix of theory and application-based questions.

Focus on advanced topics such as equilibria, transition elements, and organic synthesis.
Solve past papers to understand the structure and style of long-answer questions.
Practice explaining organic reaction mechanisms and conditions clearly.

5. Paper 5: Planning, Analysis, and Evaluation

This paper focuses on experimental design and analytical skills.

Practice designing experiments with clear hypotheses, variables, and methods.
Work on interpreting experimental data and drawing conclusions.
Review error analysis and suggest practical improvements effectively.

General Tips for Cambridge AS and A Level Chemistry 2025 For All Papers

Consistent Revision - Study each topic systematically, starting from the basics (AS) and moving to advanced (A-Level). Practice Past Papers - Solve at least five years of past papers to understand the exam pattern and identify frequently asked questions. Use Reliable Resources - Stick to Cambridge-endorsed textbooks, revision guides, and video tutorials for accurate content. Time Management - Practice solving papers within the allotted time to improve speed and efficiency. Join PW International Board's 60-Day Crash Course : Enroll in this comprehensive course designed to help you cover the syllabus, master key concepts, and practice effectively to ace your exam confidently.

International Boards Other Related Topics
IGCSE Chemistry Syllabus	IGCSE Biology Syllabus
How to Choose the Cambridge IGCSE Subjects	Difference Between IGCSE VS ICSE
Cambridge Grade Thresholds	*Cambridge IGCSE Exams with A Grade**

Cambridge AS and A Level Chemistry Syllabus FAQs

What topics are covered in Cambridge AS and A Level Chemistry Syllabus?

The syllabus includes physical, inorganic, and organic chemistry topics, along with advanced practical skills and analytical techniques.

How are the exams structured?

The exams include multiple-choice questions, structured theory papers, and practical skill assessments across five papers.

How can I prepare for the practical component?

Practice common experiments like titrations, chromatography, and qualitative analysis. Focus on planning, data interpretation, and error analysis.

Are past papers important for preparation?

Yes, solving past papers helps you understand the question patterns, marking schemes, and frequently tested topics.

Where can I find the official syllabus?

The official syllabus can be downloaded from the Cambridge website or through trusted resources like PW International Board.

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Cambridge AS and A Level Chemistry Syllabus 2025 Overview

Cambridge AS and A Level Chemistry Syllabus Overview
AS Level Subject Content	A Level Subject Content
Physical Chemistry	Physical Chemistry
1. Atomic structure	23. Chemical energetics
2. Atoms, molecules and stoichiometry	24. Electrochemistry
3. Chemical bonding	25. Equilibria
4. States of matter	26. Reaction kinetics
5. Chemical energetics
6. Electrochemistry	Inorganic Chemistry
7. Equilibria	27. Group 2
8. Reaction kinetics	28. Chemistry of transition elements

Inorganic Chemistry	Organic Chemistry
9. The Periodic Table: chemical periodicity	29. An introduction to A Level organic chemistry
10. Group 2	30. Hydrocarbons
11. Group 17	31. Halogen compounds
12. Nitrogen and sulfur	32. Hydroxy compounds
	33. Carboxylic acids and derivatives
Organic Chemistry	34. Nitrogen compounds
13. An introduction to AS Level organic chemistry	35. Polymerisation
14. Hydrocarbons	36. Organic synthesis
15. Halogen compounds
16. Hydroxy compounds	Analysis
17. Carbonyl compounds	37. Analytical techniques
18. Carboxylic acids and derivatives
19. Nitrogen compounds
20. Polymerisation
21. Organic synthesis
	Practical Skills
Analysis	A Level candidates also study practical skills.
22. Analytical techniques

Practical Skills
AS Level candidates also study practical skills.

Key Changes in Cambridge AS and A Level Chemistry Old and New Syllabus

Understand the important updates in the new syllabus compared to the old one. Detailed changes are outlined below to help you prepare effectively.

Key Changes in Cambridge AS and A Level Chemistry Old and New Syllabus
Subtopic	Old Syllabus	New Syllabus	Key Changes
15.1(c)	Substitution of an alcohol, e.g. by reaction with HX or KBr with H₂SO₄ or H₃PO₄; or with PCl₃ and heat, or with PCl₅, or with SOCl₂	Substitution of an alcohol, e.g. by reaction with HX(g); or with KCl and concentrated H₂SO₄ or concentrated H₃PO₄; or with PCl₃ and heat, or with PCl₅, or with SOCl₂	- HX now specified as HX(g). - KBr with H₂SO₄ or H₃PO₄ replaced by KCl and concentrated H₂SO₄ or H₃PO₄.
16.2(b)	Substitution to halogenoalkanes, e.g. by reaction with HX or KBr with H₂SO₄ or H₃PO₄; or with PCl₃ and heat, or with PCl₅, or with SOCl₂	Substitution to form halogenoalkanes, e.g. by reaction with HX(g); or with KCl and concentrated H₂SO₄ or concentrated H₃PO₄; or with PCl₃ and heat, or with PCl₅, or with SOCl₂	- HX now specified as HX(g). - KBr with H₂SO₄ or H₃PO₄ replaced by KCl and concentrated H₂SO₄ or H₃PO₄.

Important Notes:

HX is clarified as HX(g) , explicitly indicating its gaseous form.
Use of KBr with H₂SO₄ or H₃PO₄ has been replaced by KCl and concentrated H₂SO₄ or concentrated H₃PO₄ .

What Are Cambridge Grade Thresholds

Cambridge AS and A Level Chemistry Syllabus 2025 - Assessment Overview

Learn about the assessment structure, including paper details, weightage, and question types. A detailed breakdown is provided below for better understanding.

Cambridge AS and A Level Chemistry Syllabus - Assessment Overview
Paper	Title	Duration	Marks	Description	Weightage
Paper 1	Multiple Choice	1 hour 15 minutes	40	40 multiple-choice questions based on AS Level syllabus content. Externally assessed.	31% of AS Level 15.5% of A Level
Paper 2	AS Level Structured Questions	1 hour 15 minutes	60	Structured questions based on AS Level syllabus content. Externally assessed.	46% of AS Level 23% of A Level
Paper 3	Advanced Practical Skills	2 hours	40	Practical work and structured questions based on experimental skills in the Practical assessment section of the syllabus. Externally assessed.	23% of AS Level 11.5% of A Level
Paper 4	A Level Structured Questions	2 hours	100	Structured questions based on A Level syllabus content (includes knowledge of material from AS Level syllabus). Externally assessed.	38.5% of A Level
Paper 5	Planning, Analysis and Evaluation	1 hour 15 minutes	30	Questions based on experimental skills (planning, analysis, and evaluation). Context may be outside the syllabus content. Externally assessed.	11.5% of A Level

Cambridge AS and A Level Chemistry Syllabus 2025 Official PDF

Preparation Tips for Cambridge AS and A Level Chemistry Syllabus 2025

1. Paper 1: Multiple Choice

This paper tests your foundational knowledge of AS Level Chemistry through 40 multiple-choice questions.

Revise the AS syllabus thoroughly, especially topics like atomic structure, chemical bonding, and reaction kinetics.
Practice quick calculations for stoichiometry and energetics.
Solve multiple-choice questions from past papers to improve accuracy and time management.

2. Paper 2: AS Level Structured Questions

This paper contains structured questions based on the AS syllabus.

Practice writing detailed answers for concepts like periodicity, enthalpy, and reaction kinetics.
Focus on presenting calculations step by step, as partial marks are awarded.
Understand experimental techniques, as some questions may test practical applications.

3. Paper 3: Advanced Practical Skills

This paper tests practical skills through structured questions and experimental analysis.

Familiarize yourself with experimental setups like titrations, qualitative analysis, and chromatography.
Practice identifying sources of error and explaining improvements for experiments.
Review common calculations, such as percentage yield and molarity.

4. Paper 4: A Level Structured Questions

This paper tests A Level concepts in depth, with a mix of theory and application-based questions.

Focus on advanced topics such as equilibria, transition elements, and organic synthesis.
Solve past papers to understand the structure and style of long-answer questions.
Practice explaining organic reaction mechanisms and conditions clearly.

5. Paper 5: Planning, Analysis, and Evaluation

This paper focuses on experimental design and analytical skills.

Practice designing experiments with clear hypotheses, variables, and methods.
Work on interpreting experimental data and drawing conclusions.
Review error analysis and suggest practical improvements effectively.

General Tips for Cambridge AS and A Level Chemistry 2025 For All Papers

International Boards Other Related Topics
IGCSE Chemistry Syllabus	IGCSE Biology Syllabus
How to Choose the Cambridge IGCSE Subjects	Difference Between IGCSE VS ICSE
Cambridge Grade Thresholds	*Cambridge IGCSE Exams with A Grade**