te mātauranga matū, kaupae 2, 2011 - home » nzqa · ... for each of the following molecules....

903085

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© Mana Tohu Mātauranga o Aotearoa, 2011. Pūmau te mana.Kia kaua rawa he wāhi o tēnei tuhinga e tāruatia ki te kore te whakaaetanga a te Mana Tohu Mātauranga o Aotearoa

Te Mātauranga Matū, Kaupae 2, 201190308 Te whakaahua i te iho o te hanga me te

honohono i roto i ngā matū rerekē

9.30 i te ata Rāhina 21 Whiringa-ā-rangi 2011 Whiwhinga: Whā

Tirohia mehemea e ōrite ana te Tau Ākonga ā-Motu kei tō pepa whakauru ki te tau kei runga ake nei.

Me whakautu e koe ngā pātai KATOA kei roto i te pukapuka nei.

He taka pūmotu kua whakaritea ki te Pukaiti Rauemi L2-CHEMMR.

Ki te hiahia koe ki ētahi atu wāhi hei tuhituhi whakautu, whakamahia te wāhi wātea kei muri i te pukapuka nei.

Tirohia mehemea kei roto nei ngā whārangi 2 – 19 e raupapa tika ana, ā, kāore hoki he whārangi wātea.

HOATU TE PUKAPUKA NEI KI TE KAIWHAKAHAERE HEI TE MUTUNGA O TE WHAKAMĀTAUTAU.

MĀ TE KAIMĀKA ANAKE Paearu Paetae

Paetae Paetae Kaiaka Paetae KairangiTe whakaahua i te hononga o ngā rāpoi ngota māmā me te āhua o ngā tūmomo totoka.

Te hono i ngā āhuatanga kua tīpakohia o ngā rāpoi ngota māmā me ngā tūmomo totoka ki tō ratou hanganga.

Te matapaki i ngā āhuatanga o ngā matū e ai ki te hanganga me te hononga.

Whakakaotanga o te tairanga mahinga

See back cover for an English translation of this cover

Kia 45 meneti hei whakautu i ngā pātai o tēnei pukapuka.

PĀTAI TUATAHI

(a) TāngiatehangangaaLewis(hoahoatongiirahiko)mōiarāpoingotaewhaiakenei:

Te Rāpoi Ngota

OCl2 O2 CH3Br

Hanganga a Lewis

(b) KeiraroneingāhangangaaLewismōngārāpoingotaerua.

Te Rāpoi Ngota

HCN COCl2

Hanganga a Lewis

H C NCl C Cl

O

Mōiarāpoingota,whakaingoahiateāhuaoterāpoingota,ā,kahōmaihepūtakemōtōwhakautu.

(i) HCN Āhua:

Pūtake:

(ii) COCl2 Āhua:

Pūtake:

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You are advised to spend 45 minutes answering the questions in this booklet.

QUESTION ONE

(a) DrawtheLewisstructure(electrondotdiagram)foreachofthefollowingmolecules.

Molecule OCl2 O2 CH3Br

Lewis structure

(b) Lewisstructuresfortwomoleculesaregivenbelow.

Molecule HCN COCl2

Lewis structure

H C NCl C Cl

O

Foreachmolecule,nametheshapeofthemoleculeandgiveareasonforyouranswer.

(i) HCN Shape:

Reason:

(ii) COCl2 Shape:

Reason:

(c) Mōiarāpoingotaewhaiake:

(i) Porohitahiatekōreroewhakaahuaanamēnākuawhaiterāpoingotaitētahihonongapitorua,honongapitokorerānei.

HCl hononga pitorua hononga pitokore

N2 hononga pitorua hononga pitokore

(ii) Matapakitiangāpūtakeotōkōwhiringa.

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(c) Foreachofthefollowingmolecules:

(i) Circlethephrasethatdescribeswhetherthemoleculecontainsapolarbondoranon-polarbond.

HCl polar bond non-polar bond

N2 polar bond non-polar bond

(ii) Explainthereasonsforyourchoices.

(d) KeirarongāhoahoaewhakaatuanaingāāhuaongārāpoingotaH2SmeCO2.

H HS O C O

Ewhaihonongapitoruaēneirāpoingota.

(i) Tuhiatepitoruatangamōiarāpoingota.

H2S

CO2

(ii) Mōiarāpoingota,parahautiatōkōwhiringa.

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(d) DiagramsshowingtheshapesofthemoleculesH2SandCO2areshownbelow.

H HS O C O

Bothofthesemoleculescontainpolarbonds.

(i) Statethepolarityofeachofthesemolecules.

H2S

CO2

(ii) Foreachmolecule,giveajustificationforyourchoice.

PĀTAI TUARUA

(a) Whakaotihiateripangairaromātekīmaiitemomototoka,temomokorakorakeiroto,metehononga(tōpanakume)iwaengaingākorakoraitewāetotokaana.

Totoka Tūmomo totoka Tūmomo korakora Tōpana kume i waenga i ngā korakora

Na

P4

MgO

SO3

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QUESTION TWO

(a) Completethetablebelowbystatingthetypeofsolid,thetypeofparticlepresent,andthebonding(attractiveforces)betweenparticlesinthesolidstate.

Solid Type of solid Type of particle Attractive forces between particles

Na

P4

MgO

SO3

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(b) Ewhakaatuanangāhoahoairaroneiingāwhakaaturangahangangaahu-3otetaimanametematāpango.Hangaiaaitetaimanametematāpangoitengotawaro,engarihererekēteraupapaoēneingotairotoiiatotoka.

Tehangangaotetaimana Tehangangaotematāpango

(i) Whakaahuahiatekawengahikometemārōtangaotetaimanametematāpango.

Taimana

tekawengahiko:

temārōtanga:

Matāpango

tekawengahiko:

temārōtanga:

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(b) Thediagramsbelowshow3-Dstructuralrepresentationsofdiamondandgraphite.Diamondandgraphitearebothmadeupofcarbonatoms,buttheseatomsarearrangeddifferentlyineachsolid.

Structureofdiamond Structureofgraphite

(i) Describetheelectricalconductivityandhardnessofdiamondandgraphite.

Diamond

electricalconductivity:

hardness:

Graphite

electricalconductivity:

hardness:

(ii) Matapakitiatekawengahikometemārōtangaotetaimanametematāpango,mātewhakamahiiōmōhiokitehangangametehononga.

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(ii) Discusstheelectricalconductivityandhardnessofbothdiamondandgraphite,usingyourknowledgeofstructureandbonding.

PĀTAI TUATORU

Ewhakaatuanangāhoahoairaroitewhakaaturangahangangaongātotokaerua,arā,tetio,H2O,metekonutaipūhaumāota,NaCl.

hāorahauwai

Cl–

Na+

Tehangangaotetio Tehangangaotekonutaipūhaumāota

(a) Karewatetioite0°C,ā,karewatekonutaipūhaumāotaite801°C.

(i) Iiahoahoairungaake,porohitahiakiaKOTAHIngātōpanakumeheipārurekiarewaaitematū.

Homaitētahipūtakemōtōkōwhiringa.

Tio:

Konutaipūhaumāota:

(ii) Mātewhakamahiiōmōhiokitehangangametehononga,matapakihiatepaerewahahakaotetiometepaerewateiteiotekonutaipūhaumāota.

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QUESTION THREE

Thediagramsbelowshowstructuralrepresentationsofthetwosolidsice,H2O,andsodiumchloride,NaCl.

oxygenhydrogen

Cl–

Na+

Structureofice Structureofsodiumchloride

(a) Icemeltsat0°Candsodiumchloridemeltsat801°C.

(i) Oneachdiagramabove,circleONEoftheforcesofattractionwhichmustbeovercomeforthesubstancetomelt.

Giveareasonforyourchoice.

Ice:

Sodiumchloride:

(ii) Discussthelowmeltingpointoficeandthehighmeltingpointofsodiumchloride,usingyourknowledgeofstructureandbonding.

(b) Kawaimehatekonutaipūhaumāotairotoitewai.

Mātewhakamahiiōmōhiokitehangangametehonongamatapakihiahe pēhea,ā,he aha tekonutaipūhaumāotaewaimehaaiirotoitewai.

Whakamahiahehoahoatapangakitōwhakautu.

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(b) Sodiumchloridedissolvesinwater.

Discusshowandwhysodiumchloridedissolvesinwater,usingyourknowledgeofstructureandbonding.

Includealabelleddiagraminyouranswer.

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ANAKETAU PĀTAI

He wāhi anō mēnā ka hiahiatia.Tuhia te (ngā) tau pātai mēnā e hāngai ana.

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QUESTION NUMBER

Extra space if required.Write the question number(s) if applicable.

© New Zealand Qualifications Authority, 2011. All rights reserved.No part of this publication may be reproduced by any means without the prior permission of the New Zealand Qualifications Authority.

Level 2 Chemistry, 201190308 Describe the nature of structure and bonding

in different substances

9.30 am Monday 21 November 2011 Credits: Four

Check that the National Student Number (NSN) on your admission slip is the same as the number at the top of this page.

You should attempt ALL the questions in this booklet.

A periodic table is provided on the Resource Sheet L2–CHEMMR.

If you need more room for any answer, use the extra space provided at the back of this booklet.

Check that this booklet has pages 2 – 19 in the correct order and that none of these pages is blank.

YOU MUST HAND THIS BOOKLET TO THE SUPERVISOR AT THE END OF THE EXAMINATION.

ASSESSOR’S USE ONLY Achievement Criteria

Achievement Achievement with Merit Achievement with ExcellenceDescribe the bonding in simple molecules and the nature of types of solids.

Link selected properties of simple molecules and different types of solids to their structure.

Discuss properties of substances in terms of structure and bonding.

Overall level of performance

90

30

8M

English translation of the wording on the front cover