O Level/IGCSE Chemistry Definitions List (All Chapters) - 2025 Exam Edition
Are you losing marks on simple "Define" questions? Definitions are the low-hanging fruit of the Chemistry exam. They appear in Paper 2 and are often worth 1-2 marks each. Knowing the exact wording can be the difference between an A and an A*.
At Cambridge Classroom, we have compiled the definitive O Level/IGCSE Chemistry Definitions List (All Chapters). From Stoichiometry to Organic Chemistry, this list covers everything you need to memorize for the 2025 Syllabus.
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Why Precise Definitions Matter
Examiners are strict. If you write "amount of substance" instead of "number of moles," you might lose the mark. Our list provides the exact phrasing accepted by CAIE.
- Concise: No fluff, just the marks.
- Comprehensive: Covers all chapters from Experimental Techniques to Polymers.
- Exam-Focused: Highlights keywords in bold.
🏏 Be the Champion: Like "Pat Cummins" or "Alexander Volkanovski" dominate their fields, you need to dominate your exam. Precision is key. Don't let a loose definition knock you out.
Top 20 Must-Know Chemistry Definitions
Here is a preview of the most frequently asked definitions. Memorize these first:
Isotopes: Atoms of the same element with the same proton number but different nucleon numbers.
Electrolysis: The decomposition of an ionic compound, when molten or in aqueous solution, by the passage of an electric current.
Exothermic Reaction: A reaction that releases thermal energy to the surroundings.
Redox Reaction: A reaction involving both oxidation and reduction occurring simultaneously.
Hydrocarbon: A compound containing only carbon and hydrogen atoms.
Catalyst: A substance that increases the rate of a chemical reaction and remains chemically unchanged at the end of the reaction.
Download Chapter-Wise Definition Sheets
We've broken down the definitions by topic for easier memorization. Click below to access the specific lists:
[Image of Organic Chemistry reaction flowchart]
How to Memorize Definitions for the Exam
Don't just read. Active recall is essential:
1. Flashcards
Create physical or digital flashcards. Put the term on one side and the definition on the other. Test yourself daily.
2. "Blurting" Method
Read a topic list. Close the book. Write down every definition you remember. Compare with our list. Repeat.
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Conclusion: Your Pocket Dictionary for Success
Whether you need a chemical formula worksheet pdf or specific organic chemistry types of formulas, this list is your foundation. Download the Cambridge Classroom Definitions List today and stop losing easy marks.
Applying to Uni? Use our IBCC Equivalence Tool to see how your grades translate.
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