The particles do not melt
Explain a change of state using what we observe, what particles do and the symbols we write.
Open the complete free lessonChemistry → Senior Secondary / GCSE / IGCSE / HS → Matter, Particles & States
Use particle arrangement/motion to explain bulk state changes and diffusion
Curriculum context: Cross-system core · Global / learner-fit
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Explain a change of state using what we observe, what particles do and the symbols we write.
Open the complete free lessonSelect separation methods from property differences and distinguish physical from chemical change
Move among mass, moles and particle count while preserving formula composition and units
Learn free: The mole connects a balance to particlesRelate proton/neutron/electron counts to atomic/mass number, charge and identity
Learn free: Count particles without changing the elementExplain ionic formation and bulk properties from lattice structure and electrostatic attraction
Learn free: Charged particles need a path to conductWrite/balance equations as conservation statements and interpret coefficients as particle/mole ratios
Learn free: Balance atoms, preserve the substancesA parent, guardian or adult learner can request a free initial fit conversation, subject to availability. This is an introductory discussion, separate from a paid tutoring session or formal diagnostic assessment.