do not have an overall electric Extended writing: explain why Investigate the charge. the melting point and boiling properties of plastic point increases as the size of bags. Polymers have very large the molecule does in terms of molecules. The atoms in the Research some uses of intermolecular forces. polymer molecules are linked to covalent substances. other atoms by strong covalent Write a dialogue between two Extension: make links bonds. The intermolecular forces cartoon characters who reveal between the uses of between polymer molecules are why covalent substances do covalent substances, relatively strong and so these not conduct electricity. their properties and substances are solids at room Extended writing: explain how structure temperature. ethene polymerises. Research the uses of Substances that consist of giant Ask students how they liquid nitrogen and covalent structures are solids with model the structure of suggest measures for very high melting points. All of the diamond, silicon dioxide and it safely. atoms in these structures are graphite, to reveal their Find out why is silicon linked to other atoms by strong properties. dioxide an electrical covalent bonds. These bonds Extended writing: describe the insulator? must be overcome to melt or boil structure of diamond, silicon these substances. Diamond and dioxide and graphite. graphite (forms of carbon) and silicon dioxide (silica) are How does 'dry ice' work? examples of giant covalent Extended writing: explain how structures. covalent substances boil. WS 1.2
do not have an overall electric charge. Polymers have very large molecules. The atoms in the polymer molecules are linked to other atoms by strong covalent bonds. The intermolecular forces between polymer molecules are relatively strong and so these substances are solids at room temperature. Substances that consist of giant covalent structures are solids with very high melting points. All of the atoms in these structures are linked to other atoms by strong covalent bonds. These bonds must be overcome to melt or boil these substances. Diamond and graphite (forms of carbon) and silicon dioxide (silica) are examples of giant covalent structures. Extended writing: explain why the melting point and boiling point increases as the size of the molecule does in terms of intermolecular forces. Write a dialogue between two cartoon characters who reveal why covalent substances do not conduct electricity. Extended writing: explain how ethene polymerises. Ask students how they model the structure of diamond, silicon dioxide and graphite, to reveal their properties. Extended writing: describe the structure of diamond, silicon dioxide and graphite. How does 'dry ice' work? Extended writing: explain how covalent substances boil. WS 1.2 Investigate the properties of plastic bags. Research some uses of covalent substances. Extension: make links between the uses of covalent substances, their properties and structure Research the uses of liquid nitrogen and suggest measures for it safely. Find out why is silicon dioxide an electrical insulator?