giant ionic structures and simple molecules 0.0 / 5 ? ChemistryStructure and bondingGCSEAQA Created by: Rebecca WalmsleyCreated on: 11-04-13 12:23 what do ionic compounds have? a giant structure 1 of 18 what forces hold the ions together? electrostatic 2 of 18 this means they are solids at.... room temperature 3 of 18 do ionic compounds have high or low melting/boiling points? high 4 of 18 what happens to the ions when an ionic compound has been melted? ions are free to move 5 of 18 how can the liquids then conduct electricity? the ions carry electrical charge 6 of 18 how can some ionic compounds dissolve in water? water molecules can split up the lattice 7 of 18 substances made of simple molecules have... low melting and boiling points 8 of 18 why? the weak intermolecular forces between the simple molecules 9 of 18 why cant simple molecules carry electrical charge and conduct electricity? they have no overall charge 10 of 18 what are the forces of attraction called between molecules? intermolecular 11 of 18 when are these forces overcome? when a molecular substance melts or boils 12 of 18 what kind of force do those with the smallest molecules have? weak e.g. hydrogen, clorine (gases at room temp.) 13 of 18 what do larger molecules have? stronger attractions 14 of 18 why do ionic solids have high melting points? they have giant structures with strong electrostatic forces that hold the ions together and a lot of energy is needed to overcome the forces. 15 of 18 why can ionic substances conduct electricity when molten or when dissolved in water? the ions can move freely and carry the charge 16 of 18 why does petrol not conduct electricity? the molecules in petrol have no overall charge 17 of 18 why are substances with large molecules more likely to be liquids or solids at room temperature? the intermolecular forces are greater for larger molecules 18 of 18
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