Coaching Centre
Chapter 4: The Nature of Matter Notes
States of matter, the particle model, diffusion, density, strength, hardness and pressure, expansion, conduction and changes of state, explained with particles and interactive simulations.
Sections
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4A Solids, liquids and gases Mastered
What matter is, how to tell solids, liquids and gases apart using shape, volume and compressibility, tricky in-between substances like slime and sand, and plasma, the fourth state.
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4B The particle model of matter Mastered
Where the idea of particles came from (Democritus and Dalton), the main ideas of the particle model, how particles are arranged and move in solids, liquids and gases, and what the model gets right and wrong.
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4C Particle energy and diffusion Mastered
Kinetic energy and the kinetic theory of matter, what diffusion is, why it is fast in gases, slow in liquids and almost absent in solids, how temperature speeds it up, and how to write a particle explanation.
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4D Density Mastered
What density is, how particles explain it, calculating density = mass ÷ volume, measuring the volume of regular and irregular objects by displacement, floating and sinking, and why ice floats.
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4E Strength, hardness, pressure and melting points Mastered
Physical properties explained with particles: tensile and compressional strength, hardness and brittleness, gas and water pressure from particle collisions, and melting and boiling points.
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4F Expansion, conduction and heat capacity Mastered
Why solids, liquids and gases expand when heated and contract when cooled, expansion joints in bridges and rail lines, how heat is conducted through a solid, conductors and insulators, and heat capacity.
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4G Changes of state Mastered
Melting, freezing, evaporation, boiling, condensation and sublimation explained with particles, evaporation versus boiling, steam versus water vapour, latent heat and how to read a heating curve.
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Review Chapter 4 review and test Mastered
A one-page summary of the nature of matter and a full chapter test: multiple choice, sorting and extended responses with marking guidelines.