Ch5_WS2
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Cambridge International AS and A Level Chemistry Original material © Cambridge University Press 2011 1 Worksheet 5.2 Giant structures Giant metallic structures 1 A diagram of the structure of the metal sodium is shown below. Using the diagram above, explain why metals are: a good conductors of electricity [2] b malleable and ductile. [2] 2 a Draw a diagram showing the particles in aluminium. [3] b Use the diagram to explain why the melting point of sodium is less than that of aluminium. [3] 3 Potassium is a better electrical conductor than sodium. Explain why. [3] Giant covalent structures The diagrams below show the structures of diamond and graphite. Use the diagrams and your knowledge of their structure to answer the following questions. 4 Explain why both diamond and graphite have high melting points. [2] 5 Explain why graphite is a good conductor of electricity whilst diamond is a poor conductor. [5] 6 a Why is graphite used in making shafts for squash racquets? [3] b Why have graphite fishing rods sometimes proved to be dangerous accessories? [1] 7 a Explain why graphite is soft and slippery whilst diamond is the hardest natural substance. [4] b Give one use each for graphite and diamond which depends on these properties, and explain why it has this use. i graphite [2] ii diamond [2]
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Transcript of Ch5_WS2
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CambridgeInternationalASandALevelChemistry OriginalmaterialCambridgeUniversityPress2011 1
Worksheet5.2
Giantstructures
Giantmetallicstructures
1 Adiagramofthestructureofthemetalsodiumisshownbelow.
Usingthediagramabove,explainwhymetalsare:a goodconductorsofelectricity [2]b malleableandductile. [2]
2 a Drawadiagramshowingtheparticlesinaluminium. [3]b Usethediagramtoexplainwhythemeltingpointofsodiumislessthanthatofaluminium. [3]
3 Potassiumisabetterelectricalconductorthansodium.Explainwhy. [3]
Giantcovalentstructures
Thediagramsbelowshowthestructuresofdiamondandgraphite.
Usethediagramsandyourknowledgeoftheirstructuretoanswerthefollowingquestions.
4 Explainwhybothdiamondandgraphitehavehighmeltingpoints. [2]
5 Explainwhygraphiteisagoodconductorofelectricitywhilstdiamondisapoorconductor. [5]
6 a Whyisgraphiteusedinmakingshaftsforsquashracquets? [3]b Whyhavegraphitefishingrodssometimesprovedtobedangerousaccessories? [1]
7 a Explainwhygraphiteissoftandslipperywhilstdiamondisthehardestnaturalsubstance. [4]b Giveoneuseeachforgraphiteanddiamondwhichdependsontheseproperties,and
explainwhyithasthisuse.i graphite [2]ii diamond [2]
