C5b Ionic lattices C1.25 Explain the use of the Ask students to explain Students use information about Explain ionic lattice endings –ide and –ate in the this (very) old chemistry ionic bonds, ion size and structures; what they names of compounds joke: electrostatic forces to make and look like, how they are evaluate a model of the ion formed and how they A sodium atom bumped structure in sodium chloride. influence the crystal into a chlorine atom in Recall the formulae of C0.1 Students use polystyrene balls structure of ionic solids. the street. When they elements, simple compounds (or similar) and cocktail sticks picked themselves up the and ions to make a model of the ionic sodium atom looked Demonstrate how ionic lattice formed by sodium distressed. The chlorine formulae can be worked C1.26 Deduce the formulae of ionic chloride. When evaluating their atom said, “what’s out using the compounds (including oxides, models, students should note wrong?” “I’ve lost an method. Start with hydroxides, halides, nitrates, good and bad points. electron,” said the simple examples and carbonates and sulfates) sodium atom. The move onto include given the formulae of the chlorine atom said “are Students should form a 3 3 those that involve constituent ions you sure?” “Yes.” said cubic lattice with alternate Na+ polyatomic ions. Ensure the sodium atom, “I’m and Cl- ions. students understand positive.” Explain the structure of an that the number ‘1’ is C1.27 ionic compound as a lattice not written in formulae. Equipment: per group: 13 structure small polystyrene balls labelled a consisting of a regular (Na+ - sodium ions) 14 large Digital Crossover arrangement of ions polystyrene balls (Cl- - chloride method presentation b held together by ions) and 60 cocktail sticks. strong electrostatic forces (The chloride ions should be (ionic bonds) between roughly twice the size of the oppositely-charged ions sodium ions) C5c Properties of C1.32 Explain the properties of Set up a circuit with a Students test six substances Explain what happens ionic compounds ionic compounds limited to: low voltage power and identify which of them are during electrolysis using supply, graphite ionic compounds. a model or digital electrodes and a lamp. animation. If a
C5b Ionic lattices C1.25 C0.1 C1.26 C1.27 Explain the use of the endings –ide and –ate in the names of compounds Recall the formulae of elements, simple compounds and ions Deduce the formulae of ionic compounds (including oxides, hydroxides, halides, nitrates, carbonates and sulfates) given the formulae of the constituent ions Explain the structure of an ionic compound as a lattice structure a consisting of a regular arrangement of ions b held together by strong electrostatic forces (ionic bonds) between oppositely-charged ions Ask students to explain this (very) old chemistry joke: A sodium atom bumped into a chlorine atom in the street. When they picked themselves up the sodium atom looked distressed. The chlorine atom said, “what’s wrong?” “I’ve lost an electron,” said the sodium atom. The chlorine atom said “are you sure?” “Yes.” said the sodium atom, “I’m positive.” Students use information about ionic bonds, ion size and electrostatic forces to make and evaluate a model of the ion structure in sodium chloride. Students use polystyrene balls (or similar) and cocktail sticks to make a model of the ionic lattice formed by sodium chloride. When evaluating their models, students should note good and bad points. Students should form a 3 3 cubic lattice with alternate Na+ and Cl- ions. Equipment: per group: 13 small polystyrene balls labelled (Na+ - sodium ions) 14 large polystyrene balls (Cl- - chloride ions) and 60 cocktail sticks. (The chloride ions should be roughly twice the size of the sodium ions) Explain ionic lattice structures; what they look like, how they are formed and how they influence the crystal structure of ionic solids. Demonstrate how ionic formulae can be worked out using the method. Start with simple examples and move onto include those that involve polyatomic ions. Ensure students understand that the number ‘1’ is not written in formulae. Digital Crossover method presentation C5c Properties of ionic compounds C1.32 Explain the properties of ionic compounds limited to: Set up a circuit with a low voltage power supply, graphite electrodes and a lamp. Students test six substances and identify which of them are ionic compounds. Explain what happens during electrolysis using a model or digital animation. If a
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