MS 4a, 1a, 1c. and describe the movement of electrons. 5.2.1.4 When atoms share Recognise substances as 1 Draw dot and cross Demo the formation of Video clip: pairs of electrons, they molecules, polymers diagrams for the hydrogen chloride. form covalent bonds. or giant structures from molecules H2, Cl2, O2, These bonds between diagrams showing their N2, HCl, H2O, NH3 and Ask students to draw the atoms are strong. bonding. CH4. dot and cross diagram for Covalently bonded this reaction and explain substances may Recognise common Draw these molecules the results of the consist of small substances that consist of using the other forms demonstration in terms of molecules. small molecules from their described in the Learning electrons and atoms. Some covalently chemical formula. outcomes. bonded substances Ask students to predict the Give students a diagram of have very large Draw dot and cross formula of covalent the dot and cross diagram molecules, such as diagrams for the substances using a variety for a covalent substance polymers. molecules of hydrogen, of different diagram and ask them to write out Some covalently chlorine, oxygen, formats. the formula. bonded substances nitrogen, hydrogen have giant covalent chloride, water, ammonia Model simple covalent structures, such as and methane. substance using molecular diamond and silicon model kits. dioxide.
MS 4a, 1a, 1c. and describe the movement of electrons. 5.2.1.4 When atoms share pairs of electrons, they form covalent bonds. These bonds between atoms are strong. Covalently bonded substances may consist of small molecules. Some covalently bonded substances have very large molecules, such as polymers. Some covalently bonded substances have giant covalent structures, such as diamond and silicon dioxide. Recognise substances as molecules, polymers or giant structures from diagrams showing their bonding. Recognise common substances that consist of small molecules from their chemical formula. Draw dot and cross diagrams for the molecules of hydrogen, chlorine, oxygen, nitrogen, hydrogen chloride, water, ammonia and methane. 1 Draw dot and cross diagrams for the molecules H2, Cl2, O2, N2, HCl, H2O, NH3 and CH4. Draw these molecules using the other forms described in the Learning outcomes. Ask students to predict the formula of covalent substances using a variety of different diagram formats. Demo the formation of hydrogen chloride. Ask students to draw the dot and cross diagram for this reaction and explain the results of the demonstration in terms of electrons and atoms. Give students a diagram of the dot and cross diagram for a covalent substance and ask them to write out the formula. Model simple covalent substance using molecular model kits. Video clip:
AQA-8464F-SOW-BOND.DOCX