Changes of state in the model – fundamentals and applications
How it works
Changes of state are physical processes in which a substance changes from one state of matter (solid, liquid, gaseous) to another. In the particle model, these states are explained by the behaviour and arrangement of the particles: in solids, the particles are packed closely together and vibrate at fixed positions, in liquids they are more mobile, and in gases they are far apart and move freely. Important changes of state are melting, solidification, evaporation, condensation, sublimation and deposition. These processes do not change the chemical composition of the substance.
Changes of state arise through the addition or release of energy. In the process, the mobility and arrangement of the particles change, but the type of particle remains the same.
An example
Which change of state describes the transition from water to water vapour?
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50 Exercises
To the learning unit →Own explanation and own practice exercises by AmyMath. Subject reference framework: Chemistry. The topic assignment may vary by federal state.