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Chemistry grade 12 summative test answer, Exams of Chemistry

Chemistry

General Chemistry 12 answers for summative test sem 1

Typology: Exams

2021/2022

Available from 02/05/2022

Mariecookie
Mariecookie 🇵🇭

15 documents

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Chemistrysummativeanswer
1.Anatomofanelementhastwoelectronsinthefirstenergylevelandfiveelectronsinthesecondenergy
level.Writetheelectronconfigurationandnameoftheelements.Howmanyunpairedelectronsdoesan
atomofthiselementhave?
-TheelementisNITROGENwithanelectronconfigurationof1s22s22p3.Nitrogenhasthree
unpairedelectron.
2.Writetheelectronconfigurationforuraniumatom.Calculatethetotalnumberofelectronsineachlevel
andstatewhichlevelsarenotfull.
TheelectronconfigurationofUranium is[Rn]5f36d17s2
-Thereare2electronsinthefirstenergylevel.
-Thereare8electronsinthesecondenergylevel.
-Thereare18electronsinthethirdenergylevel.
-Thereare32electronsintheforthenergylevel.
-Thereare21electronsinthefifthenergylevel.
-Thereare9electronsinthesixthenergylevel.
-Thereare2electronsintheseventhenergylevel.
>Thefifthenergylevelisnotfull.Thesixthenergylevelisalsonotfull.
3..WhatisthedifferencebetweenLewisstructureandLewisdotsymbol?Towhatelementsdoesitmainly
apply?
-ThedifferencebetweenLewisstructureandLewisdotSymbolisthatLewisdotsymbolrepresents
electronsintheoutermostelectronshellofanatom inamoleculewhereasLewisstructurerepresentsthe
structureofmoleculesusingsymbolsforchemicalelementsanddotsymbols.Thetwoofthemmainly
applytonon-metalicelementsthayformcovalentbonds.
4.DrawaLewisstructureofthenoblegascompoundXenontetrafloride(XeF4)inwhich
allofFlourineatomsarebondedtothecentralXenonatom.
answer:
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Chemistrysummativeanswer

1 .Anatomofanelementhastwoelectronsinthefirstenergylevelandfiveelectronsinthesecondenergy level.Writetheelectronconfigurationandnameoftheelements.Howmanyunpairedelectronsdoesan atomofthiselementhave?

  • TheelementisNITROGENwithanelectronconfigurationof 1 s 22 s 22 p 3 .Nitrogenhasthree unpairedelectron. 2 .Writetheelectronconfigurationforuraniumatom.Calculatethetotalnumberofelectronsineachlevel andstatewhichlevelsarenotfull. TheelectronconfigurationofUraniumis[Rn] 5 f 36 d 17 s 2
  • Thereare 2 electronsinthefirstenergylevel.
  • Thereare 8 electronsinthesecondenergylevel.
  • Thereare 18 electronsinthethirdenergylevel.
  • Thereare 32 electronsintheforthenergylevel.
  • Thereare 21 electronsinthefifthenergylevel.
  • Thereare 9 electronsinthesixthenergylevel.
  • Thereare 2 electronsintheseventhenergylevel.

Thefifthenergylevelisnotfull.Thesixthenergylevelisalsonotfull. 3 ..WhatisthedifferencebetweenLewisstructureandLewisdotsymbol?Towhatelementsdoesitmainly apply?

  • ThedifferencebetweenLewisstructureandLewisdotSymbolisthatLewisdotsymbolrepresents electronsintheoutermostelectronshellofanatominamoleculewhereasLewisstructurerepresentsthe structureofmoleculesusingsymbolsforchemicalelementsanddotsymbols.Thetwoofthemmainly applytonon-metalicelementsthayformcovalentbonds. 4 .DrawaLewisstructureofthenoblegascompoundXenontetrafloride(XeF 4 )inwhich allofFlourineatomsarebondedtothecentralXenonatom. answer:

5 .WhatistheLewis'contributiontoourunderstandingofthecovalentbond?

  • Lewislargestcontributiontotheknowledgeofcovalentbondingwasthathedefinedsuchbondsasa pairofelectronsthataresharedbetweentwoatoms.Inaddition,heintroducedtheconceptoftheLewis dotstructure. 6 .Comparesingle,doubleandtriplebondinamoleculeandgiveanexampleofeachwithsamebonding atoms.Howdoesthebondlengthchangesfromsinglebondtotriplebond.
    • Asinglebondisonepairofelectronsbeingsharedbytwoatoms.
    • Adoublebondistwopairofelectronabeingsharedbytwoatoms.
  • Atriplebondisthreepairpfelectronsbeingsharedbytwoatoms.

singlebondsarelongerthandoublebondswhiledoublebondsarelongerthantriplebonds.Triple bondsaretheshortestbonds. 7 .Howdoesmoleculargeometryaffectspolarity? - MolecularGeometrydetermineswhetheramoleculeispolarornon-polar. 8 .Whyweneedtostudyorganiccompound?Whatisitsgeneralpurposeinourdailylife?

  • Weneedtostudyorganiccompoundtogettoknowoursorroundingsevenmore. 9 .Whatmakespolymersimportantinoureverydaylife?
  • Polymersareimportantit'sbecausethematerialweuseforeverydaylifelikefabric,plasticbottlesand manymoreismadeofpolymers. 10 .Whattypeofbiomoleculeswouldyouwanttouseforenergystorage?Supportyouranswer.
  • ThetypeofbiomoleculesthatIwanttousetostoreenergyisFats,becausefatsaretheprimarylong termenergystoragemoleculesofthebodyandfatsaresosmallandlight,they'regreatmethodtostore extraenergy.