909340

1SUPERVISOR’S USE ONLY

9 0 9 3 4

© New Zealand Qualifications Authority, 2017. 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, 201790934 Demonstrate understanding of aspects

of chemical reactions

9.30 a.m. Tuesday 14 November 2017 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 – 11 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

22

6

(b) Metals can be put into a reactivity series based on the reactions between metals and solutions.The table below shows the results of putting metals A, B, and C into metal sulfate solutions.

Solution Metal A Metal B Metal CMetal A sulfate No reaction No reaction Metal B sulfate Displaces B Displaces BMetal C sulfate Displaces C No reaction

Analyse the results to determine the order of reactivity for the three metals A, B, and C.

Justify your answer by linking the results to your knowledge of displacement reactions.

You do NOT need to identify each metal.

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E7

   

Subject:   Chemistry   Standard:   90934   Total  score:   22  

Q   Grade  score   Annotation  

1   E8  

(a)(i)  type  of  decomposition  missing  

(a)(ii)  2  correctly  LINKED  observations  (4  needed  for  m)  

(a)(iii)  has  water  as  a  product  incorrectly  

(a)(iv)  and  (b)  3  correctly  balanced  symbol  equations  for  an  e  point  

(b)  Correctly  recognised  all  3  reaction  types,  heat  required  and  all  observations  stated  correctly  and  linked  to  reactants/products  

2   E7  

(a)(i)  both  answers  correct  

(a)(ii)  correctly  identifies  the  precipitation  reaction  and  correctly  explains  the  precipitation  reaction  with  some  omissions  in  detail  and  an  error  in  understanding.  The  explanation  for  displacement  is  very  clear,  correct  and  detailed.  

(b)  Displacement  already  explained  correctly  on  previous  page.  

3   E7  

(a)(i)  all  answers  correct  

(a)(ii)  all  answers  correct  

(a)(iii)  All  observations  linked  to  reactants  and  products  with  correct  explanation  of  process,  but  no  referral  to  ions  

(b)  all  3  equations  correct  and  procedure  and  observations  for  identification  of  unknowns  clear  and  logical.