of a substance from a given model or diagram in these forms showing the atoms and bonds in the molecule. 4.6.2.5 Substances that consist of Use the idea that 1 Represent melting and boiling Research some uses of Video clips: molecules are usually gases or intermolecular points of covalent substances covalent substances. YouTube: liquids that have relatively low forces are weak to scale, on a giant Extension: make links melting points and boiling points. compared with thermometer. between the uses of covalent bonds to These substances have only Extended writing: describe covalent substances, explain the bulk weak forces between the melting points and boiling their properties and YouTube: properties of molecules (intermolecular forces). points of covalent substances. structure. molecular It is these intermolecular forces Describe the difference RSC experiment - test substances. that are overcome, not the between an intermolecular and compare the covalent bonds, when the Recognise force and a covalent bond. conductivity of simple substance melts or boils. polymers from covalent and ionic Students demonstrate and diagrams showing The intermolecular forces substances . communicate the relationship bonding. increase with the size of the between melting points and Model polymers. molecules, so larger molecules Recognise giant boiling points, size of molecule Make a polymer from have higher melting and boiling covalent and size of intermolecular cornstarch. points. structures from forces, by designing an diagrams showing These substances do not conduct animation. their bonding. electricity because the molecules
of a substance from a given model or diagram in these forms showing the atoms and bonds in the molecule. 4.6.2.5 Substances that consist of molecules are usually gases or liquids that have relatively low melting points and boiling points. These substances have only weak forces between the molecules (intermolecular forces). It is these intermolecular forces that are overcome, not the covalent bonds, when the substance melts or boils. The intermolecular forces increase with the size of the molecules, so larger molecules have higher melting and boiling points. These substances do not conduct electricity because the molecules Use the idea that intermolecular forces are weak compared with covalent bonds to explain the bulk properties of molecular substances. Recognise polymers from diagrams showing bonding. Recognise giant covalent structures from diagrams showing their bonding. 1 Represent melting and boiling points of covalent substances to scale, on a giant thermometer. Extended writing: describe melting points and boiling points of covalent substances. Describe the difference between an intermolecular force and a covalent bond. Students demonstrate and communicate the relationship between melting points and boiling points, size of molecule and size of intermolecular forces, by designing an animation. Research some uses of covalent substances. Extension: make links between the uses of covalent substances, their properties and structure. RSC experiment - test and compare the conductivity of simple covalent and ionic substances . Model polymers. Make a polymer from cornstarch. Video clips: YouTube: YouTube:
AQA-8465-SOW-ISLD.DOCX