Edexcel IAL Chemistry: What You Need to Know to Pass
Prepare for Edexcel IAL Chemistry Unit 1 — The Only Revision Plan You’ll Need

The Four Must-Master Topics
Based on exam data and official resources, these topics appear most frequently and carry the highest marks in IAL Chemistry Unit 1.
1. Formulae, Equations & Amount of Substance
According to past exam analysis, calculation questions make up 25-30% of the total marks¹.
Focus on:
- Mass, volume, and concentration calculations
- The ideal gas equation: PV = nRT
- Mass spectrometry process and applications
- Parts per million calculations
Quick Practice: Calculate the number of moles in 5.6g of iron. (Answer: 0.1 mol, using moles = mass ÷ molar mass)
2. Atomic Structure & Periodic Trends
This section typically accounts for 20-25% of exam questions².
Key areas:
- Electron configurations (1s², 2s², etc.)
- Periodic trends with reasons
- Atomic radius decreases across a period
- Ionisation energy increases across a period
- s, p, and d orbital shapes and electron filling
3. Bonding & Structure
This topic appears in roughly 25% of exam questions and connects to many other topics².
Learn:
- Metallic, ionic, and covalent bonding differences
- Dot-and-cross diagrams
- Molecular shapes and bond angles
4. Introductory Organic Chemistry
Organic chemistry makes up about 20% of Unit 1 but grows more important in later units³.
Focus on:
- Free radical substitution of alkanes
- Electrophilic addition to alkenes
- Testing for alkenes using bromine water
- Oxidation reactions of alkenes
Study Plan That Works
Data from student surveys shows that spaced repetition improves retention by up to 74%⁴.
- Make flashcards for formulas and definitions
- Practice 3-5 calculation problems daily
- Draw mechanisms and structures regularly
- Test yourself weekly on all topics
Exam Tips Based on Examiner Reports
- Show all calculation steps (worth 67% of marks even with wrong final answer)
- Include units in all answers
- Use correct arrow notation in mechanisms
- Link properties to structure when explaining
Resources You Can Trust
- Pearson Edexcel IAL Chemistry Specification - Official exam requirements
- Solved Past Paper - practice questions
- Chem-Bio.info - Detailed explanations of complex topics
Bottom Line
Focus your study time on these four key areas. They make up over 90% of the exam and build the foundation for Units 2-6. Understanding why chemical processes happen will earn you more marks than just memorising facts.
Best of luck
Hosni
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