Who this is for: Cambridge IGCSE Coordinated Science (0654) students who want elements, compounds and mixtures — telling them apart and knowing how to separate them — to become a reliable source of marks instead of a definition-recall exercise.
What query it owns: how to understand and revise elements, compounds and mixtures in Cambridge IGCSE Coordinated Science.
Why this is safe: this page owns the elements-compounds-and-mixtures revision-guide angle, while Tutopiya’s Elements, Compounds And Mixtures subtopic page owns the learning resource and the free Elements, Compounds And Mixtures quiz owns the practice.

Everything around you is made of elements, compounds or mixtures. Cambridge IGCSE Coordinated Science (0654) expects you to define each type, give examples, and explain why mixtures can be separated by physical means but compounds cannot. This guide links each category to what examiners reward.

Key takeaways

• An element contains only one type of atom (e.g. O₂, Fe, S).
• A compound contains two or more elements chemically bonded in fixed proportions (e.g. H₂O, NaCl).
• A mixture contains two or more substances not chemically combined; composition can vary.
• Mixtures are separated by physical methods (filtration, distillation, chromatography).
• Compounds can only be broken down by chemical methods (e.g. electrolysis).

What are elements, compounds and mixtures in Cambridge IGCSE Coordinated Science?

An element is a substance that cannot be broken down into simpler substances by chemical means. A compound is formed when elements combine chemically in fixed ratios, giving new properties. A mixture contains two or more substances physically combined — air, seawater and brass are mixtures. Knowing the difference is foundational for all chemistry in Coordinated Science.

You can read the full explanation, diagrams and notes on Tutopiya’s Elements, Compounds And Mixtures subtopic page before you attempt questions.

Element vs compound vs mixture

Type	Definition	Composition	Example
Element	One type of atom only	Fixed (single element)	Oxygen (O₂), carbon (C), iron (Fe)
Compound	Two+ elements chemically bonded	Fixed ratio by mass	Water (H₂O), carbon dioxide (CO₂)
Mixture	Substances not chemically combined	Variable proportions	Air, seawater, sand and salt

Properties that help you distinguish them

Property	Element	Compound	Mixture
Can be separated physically?	N/A (already pure element)	No	Yes
Fixed melting/boiling point?	Yes	Yes	No (melts/boils over a range)
Formula	Element symbol	Fixed chemical formula	No single formula
Properties	Own properties	Different from constituent elements	Properties of components combined

Elements, compounds and mixtures in past-paper wording: command words that matter

Command word / phrase	What the question wants	Typical stem
Define	Give precise meaning	”Define the term compound.”
Classify	Identify type	”Classify air as an element, compound or mixture.”
Explain	Justify with reasoning	”Explain why seawater is a mixture.”
State how to separate	Name physical method	”State how to separate a mixture of sand and salt.”

Worked exam-style stems (how to answer the wording)

1. “Define the term compound.” A substance made of two or more elements chemically combined in a fixed ratio. Mark-scheme reward: chemically combined and fixed ratio both mentioned.
2. “Classify air as an element, compound or mixture. Explain your answer.” Mixture — air contains nitrogen, oxygen and other gases physically mixed; proportions vary slightly. Reward: mixture and idea of separate gases not chemically bonded.
3. “Explain why a mixture of iron filings and sulfur can be separated by a magnet but iron sulfide cannot.” In the mixture, iron and sulfur are not chemically combined, so the magnet attracts the iron. In iron sulfide (compound), iron is chemically bonded to sulfur and cannot be separated magnetically. Reward: physical vs chemical combination.

Test yourself with the Elements, Compounds And Mixtures quiz once you can classify examples and explain separation methods.

How elements, compounds and mixtures connect to the rest of Coordinated Science

This topic builds on Physical And Chemical Changes and leads into Atomic Structure And The Periodic Table and bonding. The Cambridge IGCSE Coordinated Science resource hub links every Atoms, Elements And Compounds subtopic.

Common mistakes students make

• Calling O₂ a compound (it is an element — only oxygen atoms).
• Calling brass or steel compounds (they are mixtures / alloys).
• Thinking compounds can be separated by filtration or distillation.
• Confusing pure substance (element or compound) with pure in everyday language.
• Forgetting that mixture proportions can vary but compound ratios are fixed.

When you need more support

If element/compound/mixture questions keep costing marks, work through the Elements, Compounds And Mixtures quiz, then get focused help from a Cambridge IGCSE Coordinated Science tutor.

Frequently asked questions

Is elements, compounds and mixtures hard in Coordinated Science? The definitions are straightforward — marks are lost when students misclassify alloys, air or O₂.

What is the difference between a compound and a mixture? A compound has elements chemically bonded in fixed proportions; a mixture has physically combined substances with variable proportions.

Is air an element, compound or mixture? A mixture — it contains nitrogen, oxygen, argon and other gases physically combined.

How do I revise elements, compounds and mixtures effectively? Learn definitions, classify ten examples, link separation methods to mixtures only, then take the quiz.

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