How to Pass Unit 1 IAL Chemistry in One Month: A Data-Backed Study Guide

Hosni Showike • 2 December 2025

The High-Weight Topics You MUST Focus On for Unit 1 IAL Chemistry

Thumbnail image showing a chemistry teacher smiling beside bold text that reads “This Is the Best Way to Revise Unit 1 Chemistry,” used for a blog post about effective Unit 1 IAL Chemistry revision strategies.

Preparing for Edexcel IAL Chemistry Unit 1 in just 30 days is possible—but only if you study the right topics. This guide shows you exactly what to focus on, based on real exam data.

What You Need to Know About the Exam

Unit 1 Chemistry is worth 40% of your AS Chemistry grade. The exam has 80 total marks split into two sections: multiple-choice questions and written answers [^1].

Here's the key insight: not all topics are equally important. Past exam papers show that certain topics appear much more often than others [^2]:

Stoichiometry (mole calculations): 25-30% of marks
Bonding and structure: 25% of marks
Atomic structure and periodic trends: 20-25% of marks
Organic chemistry: 20% of marks

These four topics make up over 90% of the exam. If you master them, you'll pass [^3].

Your 4-Week Study Plan

Week 1: Fix Your Weak Areas First

Start by studying the topics that confuse you most. This seems backwards, but it works. When you strengthen your weak areas early, you'll have time to practice harder questions later [^4].

What to study this week:

Days 1-3: The mole concept and stoichiometry (how to calculate moles, balance equations, find percentage yield)
Days 4-7: Atomic structure (electron configurations, atomic radius, ionization energy)
Don't try to memorise everything. Instead, solve practice problems with your textbook open. When you get a question wrong, look up the answer and understand why it's correct [^4].

Week 2: Master the Four Key Topics

This week, you're moving from understanding concepts to solving exam-style questions. Work through written questions (not multiple-choice yet) because mark schemes explain the answers in detail [^4].

Focus on these four areas:

1. Stoichiometry and the Mole Concept

Calculate moles from mass and volume
Balance chemical equations
Find percentage yield and atom economy

2. Atomic Structure and Periodic Trends

Write electron configurations (1s², 2s², 2p⁶, etc.)
Explain why atomic radius decreases across a period
Explain why ionisation energy increases across a period

3. Bonding and Structure

Understand ionic, covalent, and metallic bonding
Explain how bonding affects melting point and conductivity
Draw dot-and-cross diagrams

4. Organic Chemistry

Free radical substitution of alkanes (the mechanism and steps)
Electrophilic addition to alkenes (how alkenes react with bromine and hydrogen)
How to test for alkenes using bromine water
For organic chemistry, draw the reaction mechanisms on flashcards. Draw them by hand multiple times. Your brain remembers things better when you physically write them [^4].

Week 3: Practice Past Papers

You have access to roughly 20 past papers from 2019 to 2025. These are your best study tool [^4].

Here's how to use them:

Complete one full paper every 2-3 days
Time yourself: finish in 70-80 minutes (the actual exam length)
Start with written questions first—they have better mark scheme explanations

Write down every mistake you make and organize them by topic

As you work through papers, you'll notice the same question types repeat. Once you recognize the patterns, you'll know what to expect on exam day [^4].

Week 4: Final Practice and Review

In the final week, complete 2-3 full mock exams under real exam conditions (no notes, no distractions, 70-80 minutes each). Do these by Wednesday or Thursday, not the night before your actual exam [^4].

After each mock, review your mistakes. Focus on the topics where you made the most errors. These are your weak spots.

How to Study Each Day

You don't need to study for 8 hours straight. Instead, study for 2-3 hours with focus. Here's a simple daily structure [^3]:

20 minutes: Review flashcards (periodic trends, electron configurations, organic mechanisms)
20 minutes: Test yourself without notes (try to recall information from memory, then check if you're right)
20 minutes: Solve 5 practice questions on one topic

Rotate through different topics each day so you cover everything.

The Calculation Question Advantage

Here's something important: calculation questions are easier to get marks on than you think [^3].

Mark schemes give 67% of the marks just for showing your working—even if your final answer is wrong [^3]. This means if you show all your steps, you'll get most of the marks.

Always do this for calculation questions:

Write down the formula you're using
Show every single step
Include units in every answer
If you're stuck, write something—partial credit exists

Master these calculation types:

Mole calculations (from mass, volume, concentration)
Percentage yield
Empirical and molecular formulas

Organic Chemistry: The Must-Know Topic

Organic mechanisms appear in every past paper [^4]. You cannot skip this.

Free radical substitution of alkanes:

Initiation: UV light breaks Cl-Cl bonds
Propagation: Free radicals attack alkane molecules
Termination: Free radicals combine and stop reacting

Electrophilic addition to alkenes:

The C=C double bond attracts the bromine molecule
A carbocation forms (positively charged carbon)
The bromide ion attacks the carbocation
Product: a dibromide

Draw these mechanisms on flashcards and review them every day. Your hand should be able to draw them without thinking.

What to Do on Exam Day

During the exam, you have two choices [^4]:

Follow the paper in order (start with question 1)
Do written questions first, then multiple-choice

Practice both ways during your mock exams. Figure out which one helps you manage time better and feel less stressed.

The night before the exam: Don't do another practice paper. Instead, review your flashcards and the mistakes you've made. Get good sleep—your brain needs rest to remember information [^4].

The Best Resources to Use

Chem-Bio.info: Detailed explanations and summary sheets made specifically for IAL Chemistry [^1][^3][^6]
Pearson Edexcel Specification: The official list of what you need to know [^1]
Physics & Maths Tutor: Practice questions organized by topic Past papers (2019-2025): Your main study material

The Bottom Line

Unit 1 Chemistry isn't about being a genius. It's about studying smart. Focus on the four topics that make up 90% of the exam: stoichiometry, atomic structure, bonding, and organic chemistry [^3].

Show all your working on calculations. Draw organic mechanisms until they're automatic. Practice past papers. Bookmark your mistakes and review them.

If you follow this plan for 30 days, you'll pass Unit 1 Chemistry.