C2 2.1 STRUCTURE AND PROPERTIES 0.0 / 5 ? ChemistryNanoscienceStructure and bondingStructure and propertiesC2GCSEAQA Created by: 12dalelCreated on: 14-11-16 17:27 Why do ionic compounds have high melting points? because they have very strong forces of electrostatic attraction which need a lot of energy to break 1 of 13 Why do ionic compounds conduct electricity when melted or dissolved in water? Because when in liquid state the ions are free to move around and carry the electrical charge 2 of 13 Which type of covalent structures have low boiling and melting points? Simple molecules because they are held together by weak intermolecular forces 3 of 13 Why can't simple molecules conduct electricity? because they have no overall charge so they cannot carry the electrical charge 4 of 13 Why can graphite conduct electricity? Because it has delocalised electrons along it's layers 5 of 13 Why can we bend and shape metals? Because their layers can easily slide over each other 6 of 13 Why are alloys harder than pure metals? Because the atoms of other elements disrupt the regular structure so the layers cannot slide over each other 7 of 13 Why can metals conduct electricity and heat? Because the delocalised electrons are free to move and can carry the charge 8 of 13 How are shape memory alloys used in real life? to help heal broken bones and for braces 9 of 13 What can affect the properties of polymers? The type of monomers we use and the reaction conditions 10 of 13 What properties do thermosoftening polymers have? They are easily melted down and are made up of a tangled web of individual polymer chains 11 of 13 What properties do thermosetting polymers have? The strong covalent bonds holding layers together means that thermosetting polymers won't easily soften 12 of 13 What is nanoscience? The study of small particles between 1-100 nanometres in size 13 of 13
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