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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_h , � ,_J?z � f1 Chemistry 90934, 2017
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.