place at the melting point, predict the states of matter in a solid, liquid boiling and condensing substances at different and gas. take place at the boiling temperatures given YouTube: point. appropriate data Define melting and The three states of matter explain the different boiling point. can be represented by a temperatures at simple model. In this changes of state occur Grade 9: explain the model, particles are in terms of energy differences in changes of represented by small solid transfers and types of state in terms of spheres. Particle theory bonding intermolecular forces of can help to explain recognise that atoms attraction between a short melting, boiling, freezing themselves do not molecule ie methane and and condensing. have the bulk a longer molecule ie properties of materials pentane. (Higher Tier only) explain the limitations The amount of energy of the particle theory in needed to change state relation to changes of from solid to liquid and when particles are from liquid to gas depends represented by solid on the strength of the spheres which have no forces between the forces between them. particles of the substance. WS 1.2 The nature of the particles involved depends on the Visualise and represent type of bonding and the 2D and 3D forms structure of the substance. including two The stronger the forces dimensional between the particles, the representations of 3D higher the melting point objects. MS 5b and boiling point of the substance. (Higher Tier only) Limitations of the simple above include that in the model there are no
place at the melting point, boiling and condensing take place at the boiling point. The three states of matter can be represented by a simple model. In this model, particles are represented by small solid spheres. Particle theory can help to explain melting, boiling, freezing and condensing. The amount of energy needed to change state from solid to liquid and from liquid to gas depends on the strength of the forces between the particles of the substance. The nature of the particles involved depends on the type of bonding and the structure of the substance. The stronger the forces between the particles, the higher the melting point and boiling point of the substance. (Higher Tier only) Limitations of the simple above include that in the model there are no predict the states of substances at different temperatures given appropriate data explain the different temperatures at changes of state occur in terms of energy transfers and types of bonding recognise that atoms themselves do not have the bulk properties of materials (Higher Tier only) explain the limitations of the particle theory in relation to changes of when particles are represented by solid spheres which have no forces between them. WS 1.2 Visualise and represent 2D and 3D forms including two dimensional representations of 3D objects. MS 5b matter in a solid, liquid and gas. Define melting and boiling point. Grade 9: explain the differences in changes of state in terms of intermolecular forces of attraction between a short molecule ie methane and a longer molecule ie pentane. YouTube: