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Understanding the difference between elements, compounds, and mixtures is one of the first big steps in Chemistry. An element contains only one type of atom and cannot be broken down chemically into simpler substances. A compound contains two or more elements chemically bonded together in a fixed ratio. A mixture contains two or more substances physically combined, not chemically joined, so they can often be separated by physical methods. Knowing these differences helps us build a strong foundation for everything else in Chemistry.

IGCSE Chemistry Topic 1 (CIE 0620) using the particle model:

• Why solids keep their shape
• Why liquids flow but don’t compress much
• Why gases are easy to compress
• How particle spacing, motion, and forces explain everything

The key idea students often miss:
States of matter are controlled by the balance between particle motion (kinetic energy) and attractive forces between particles.

Once this clicks, questions become easier:
You stop guessing… and start explaining like the mark scheme expects. ExamPreparation STEMLearning ChemistryTeacher