909340

1SUPERVISOR’S USE ONLY

9 0 9 3 4

© New Zealand Qualifications Authority, 2016. All rights reserved.No part of this publication may be reproduced by any means without the prior permission of the New Zealand Qualifications Authority.

ASSESSOR’S USE ONLY

TOTAL

Level 1 Chemistry, 201690934 Demonstrate understanding of aspects

of chemical reactions

2.00 p.m. Monday 21 November 2016 Credits: Four

Achievement Achievement with Merit Achievement with ExcellenceDemonstrate understanding of aspects of chemical reactions.

Demonstrate in-depth understanding of aspects of chemical reactions.

Demonstrate comprehensive understanding of aspects of chemical reactions.

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 and other reference material are provided in the Resource Booklet L1–CHEMR.

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

Check that this booklet has pages 2 – 8 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.

Excellence

24

2

QUESTION ONE

(a) Name the prey1pitate that is fo1med when the following solutions are mixed together.You m

://e the so

.

lubility mies provided in the resourc booklet.

(i) r:: nitrate and sodium carbonate

"?ff\e, Cll,fblJ ttti& ... __ "'.'."_l..i,i fO 3 _ _ _____ . ___ ___ _____ _ _ ___ .

(ii) Barium chloride and sodium sulfate

(b) (i) Copper sulfate solution and sodium 7 solutionreact to form a precipitate.

Complete the following eq�n-showing the formation of the precipitate. ----··- .'

---�Wliy--is-this'reaction classified as a precipitation reaction?.

lk __ �A.'1t'11'.1.Ll_�_L(A_SJ) 'I �4, _tJ_g_o_H _.$.Wii.p-P"""cl:l'leY·'.c . - .. . - --. . ·_·. . ' 9;\(c).( ... J_ Jon�--� it2rm_Jbe _1n5">��\e,_fve.ci�--�f-Lu.(01-1)2.- �-----···· _____ .. __

\ --------11,.e._ tut+

Jvom_-\'be.. (u50.4�q,)-�,J�ti..vi1h_-lk_.0H-_ _ _ _ _ L

0 U.� Al

tl hlJ · _ '0 l· I f\lg.� I j · ·· · ,: ·

01 Vl'L., VIC-- I" _un-[t,q,) _ .i -'\ __ cu, (/1 _ _ __ _ c,..1'4 _sJ2.\\.!.D_ie.._1 lreM0 I'll rAl'IJiin9

<Ancl. . u.� ,peilt&n>Yi'ons .. i-:;" Jb.� c.Ui _n!:>_t ±iLke.-p�!"l-tn., ih. _ _ _

re�1,h11!l-_._ A·_ �re,(ipil:J:e. fjovm 5 CM) __ *'e. e.k,1\"i2�W"� cJ:lytacJ,·111'1,-' ·_ __ _

p�i����;IA�ol�:�;� o;�Ji'.�{:;�-rb.G.IL�-Jtrc,!'J,:Q!1_b�IWe(J'I, - ---c-

(iii) Describe any observations that would be seen during this reaction, and lin\< these to thereactants and products.

. . . .

AblLle .So\1,tliOlo -{Lu SO<t (t;<<t)j- is .... t'l\{)<.a.d_i.11-/i-k <a, __

le(,,�., avtu�ol'"l---[MwO_HC£<c,,)') tv furfu o.,.,_ ___ .. ___ kl_1>-e .it1.�11JtJble 1

pre<ipi-J-oh, f Uk[OtV--1 , ir-,_ __ _ (:\. __ e,o\ouv.l.il> s.,\.,.\i<21'1 ___________ _ speckh>.-

®Sc;,\i� __ Qs- Nllll- 0hcL_so '\1.·.11,oos_. _ .. ---.... ···············

-(1l,u.':>9A (""0 +lNCi\DJ-l L"<CJ --�-- w...(01·D2lsY-_hlQ.2c SQ� . -S\IW..�ol et.tiwi\h'on,_ - �:-c:� _ _:_ - ---- - ---- - - ----

� Chemistry 90934, 2016 /

Al1Sel USE

Annotated  Exemplar  Template  

Excellence  Exemplar  2016  

Subject:   Chemistry   Standard:   90934   Total  score:   24  

Q   Grade  score   Annotation  

1   E8  

The  candidate  correctly  identified  the  precipitates  and  gives  a  correctly  balanced  equation.  

In  part  (b),  the  candidate  correctly  identifies  that  two  solutions  form  a  solid  and  identifies  all  four  species  which  are  linked  to  the  observations.  

In  part  (c),  the  candidate  gave  a  correct  method,  with  complete  observations,  including  that  the  solution  turned  pale  green,  which  many  candidates  missed.  All  equations  were  correct.  

2   E8  

The  candidate  links  the  correct  colours  to  the  appropriate  reactants  and  products,  with  a  correct  equation.  

In  part  (b),  the  candidate  clearly  describes  both  reaction  types  and  states  why  they  are  classified  as  such.    A  good  account  of  electron  transfer  for  both  reactions  is  given.    

3   E8  

In  part  (a),  the  candidate  gave  four  observations  linked  to  the  appropriate  reactants  and  products.    The  candidate  clearly  describes  what  decomposition  means  and  links  this  to  the  reaction  itself,  with  a  correct  description  of  what  a  catalyst  does.  

In  part  (b),  the  candidate  provides  a  logical  sequential  account  of  how  to  determine  the  identity  of  the  three  powders.    Correct  equations  were  given.