IGCSE Physics

Syllabus content2. Thermal physics2.1 Simple kinetic molecular model of matter2.1 (a) States of matterCore• State the distinguishing properties of solids, liquidsand gases2.1 (b) Molecular modelCore• Describe qualitatively the molecular structure ofsolids, liquids and gases• Interpret the temperature of a gas in terms of themotion of its molecules• Describe qualitatively the pressure of a gas in termsof the motion of its molecules• Describe qualitatively the effect of a change oftemperature on the pressure of a gas at constantvolume• Show an understanding of the random motion ofparticles in a suspension as evidence for the kineticmolecular model of matter• Describe this motion (sometimes known asBrownian motion) in terms of random molecularbombardment2.1 (c) EvaporationCore• Describe evaporation in terms of the escape ofmore-energetic molecules from the surface of aliquid• Relate evaporation to the consequent cooling2.1 (d) Pressure changesCore• Relate the change in volume of a gas to change inpressure applied to the gas at constant temperatureSupplement• Relate the properties of solids, liquidsand gases to the forces and distancesbetween molecules and to the motion ofthe molecules• Show an appreciation that massiveparticles may be moved by light, fastmovingmoleculesSupplement• Demonstrate an understanding of howtemperature, surface area and draught overa surface influence evaporationSupplement• Recall and use the equation pV = constantat constant temperatureCambridge IGCSE Physics 0625. Syllabus for examination in 2015.21