C2, Structure, properties and uses 0.0 / 5 ? ChemistryStructure and bondingGCSEAQA Created by: emmajane_Created on: 04-03-14 18:25 SIMPLE MOLECULAR- What are the molecules held together by? Strong covalent bonds 1 of 29 SIMPLE MOLECULAR- Why do they have a low boiling and melting point and do not conduct electricity? Because they are joined by weak forces 2 of 29 GIANT COVALENT- Why do they form a giant lattice Becausase they held my many covalent bonds 3 of 29 GIANT COVALENT- What are special about diamond and graphite? They have different properties 4 of 29 What is a macromolecule- name 3 examples A giant covalent structure and graphite, diamond and silica 5 of 29 GRAPHITE- Why does graphite conduct electricity? Because it has free ions called delocalised electrons 6 of 29 GRAPHITE- How many atoms are the molecules joind by? 3 7 of 29 GRAPHITE- why can the layers slide over eachother? Because there are no covalent bonds and there is only an intermolecular force between them 8 of 29 GRAPHITE- What are the layers made of? Carbon atoms 9 of 29 DIAMOND- what is diamond made of? Carbon atoms 10 of 29 DAIMOND- what is the structure like? A giant covalent structure 11 of 29 DIAMOND- Does diamond conduct electricity? No 12 of 29 SILICA- what is silica made of? Silicone and oxygen 13 of 29 SILICA- what is the structure similar to? The diamond structure 14 of 29 POLYMERS, THERMOSOFTENING- Why does i soften when heated and harden when cooled? Because of tangled polymer chains uncoil and slide past eachother. This makes it flexible 15 of 29 POLYMERS, THERMOSETTING- How are the chains joined? By cross-links. They don't easily slide 16 of 29 POLYMERS, THERMOSETTING- What is thermosetting used for? The rubber for tyres 17 of 29 POLYMERS, THERMOSETTING- what happens once it's moulded? It doesn't soften again 18 of 29 IONIC COMPOUNDS- Why can't ionic compounds conduct electricity? Because ions can't move around the lattice 19 of 29 METALS- Why are metals malleable Because the layers of atoms can slide over eachother when mettal is bent or hammered 20 of 29 METALS- In giant structures, what can the electrons on the outer shell free to do? Move around 21 of 29 METALS- Why do metals have a high melting point? Because metallic bonds are strong, so metals can maintain their structure 22 of 29 METALS- Why are metals good conductors? Because electrons can move around their outer shell 23 of 29 ALLOYS- What is an alloy? A mixture of two or more elements, where at least one element is a metal 24 of 29 ALLOYS- Why are alloyed metals very strong Becausase they are all different sizes and have a distorted structure, amking it hard for them to slide over eachother 25 of 29 NANOPARTICLES- What is the size range of nanoparticles? 100nm-1nm 26 of 29 NANOPARTICLES- Why can nanoparticles react quickly, making them useful catalysts? Becaue they have a large surface area compared to volume 27 of 29 NANOPARTICLES- What can nanoparticles be used for? Sun screen, to stop harmful ultra violet light without appearing white on the skin 28 of 29 GRAPHITE- Why are the layers weak and slippery? Becauae there is only intermolecular forces between the layers 29 of 29
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