Chemistry-C2-Allotropes of Carbon +( Giant Covalent Structures ) 0.0 / 5 ? ChemistryMetals, metal ores and alloysGCSEAQA Created by: tonisha_Created on: 18-11-22 20:05 Small covalent molecules have ______ what? (2) low melting and boiling points 1 of 44 This is because they are connected with weak? intermolecular forces 2 of 44 Giant covalent molecules are always _____ at room temperature? solid 3 of 44 This is because they have _____ of _____ ______ bonds? millions of strong covalent bonds 4 of 44 Therefore all giant covalent structures have high? melting and boiling points 5 of 44 What is another example of a giant covalent structure? Silicon dioxide 6 of 44 What two elements is silicon dioxide? silicon and oxygen 7 of 44 It has very high? melting and boiling points 8 of 44 It has very strong covalent bonds which require? a lot of energy to break 9 of 44 ALLOTROPES OF CARBON ----------------------------- What are four allotropes of carbon? diamond graphite graphene fullerene 10 of 44 Diamond is formed from what element? carbon 11 of 44 Each carbon atoms forms _ covalent bonds to other carbon atoms? 4 12 of 44 This gives it a very high? melting and boiling point 13 of 44 It is? hard 14 of 44 It would require a lot of _______ to _______ the covalent bonds? a lot of energy to break 15 of 44 It does not conduct what two things? heat or electricity 16 of 44 This is because? it has no delocalised electrons to carry charge throughout it 17 of 44 Graphite is formed from what element? carbon 18 of 44 Each carbon atom forms _ covalent bonds? 3 19 of 44 This leaves _____ ______ electron? one delocalised 20 of 44 Which is free to? move around 21 of 44 And carry? charge 22 of 44 This allows graphite to do what? conduct heat and electricity 23 of 44 The covalent bonds are in ______ rings? hexagonal 24 of 44 And are arranged in? layers 25 of 44 However the layers are not ______ together meaning they can ? not bonded together meaning they can move 26 of 44 This gives graphite what two properties? soft and slippery 27 of 44 This makes it ideal as a what? lubricant 28 of 44 Due to the strong covalent bonds, graphite high? melting and boiling points 29 of 44 However Graphite is NOT? a metal 30 of 44 Graphene is what? a single layer of graphite 31 of 44 How thick is it? one atom thick 32 of 44 It is a good ? conductor of electricity 33 of 44 Due to its? delocalised electron 34 of 44 It is also strong and ? light 35 of 44 Fullerenes are molecules of carbon atoms with what? hollow shapes 36 of 44 They usually have hexagonal rings but can also contain ______ or _______ rings? pentagonal or heptagonal 37 of 44 What was the first fullerene molecule discovered? buckministerfullerene 38 of 44 USES ------------ Can be used to deliver _______/_____ in the body? pharmaceuticals or drugs 39 of 44 Can be used as a ? lubricant 40 of 44 Since it has a high _____ ____ it can also be used as a _____? high surface area catalyst 41 of 44 It can also for carbon ________? nanotubes 42 of 44 These have very high ______ strength? tensile streching 43 of 44 They also conduct? electricity and heat 44 of 44
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