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90944
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NEW ZEALAND QUALIFICATIONS AUTHORITY
MANA TOHU MATAUR.ANGA 0 AOTEAROA
Level 1 Science, 2014
90944 Demonstrate understanding of aspects
of acids and bases
9.30 am Monday 10 November 2014
Credits: Fou r
Achievement
Demonstrate understanding of aspects
of acids and bases.
Achievement with Merit
Demonstrate in-depth understanding of
aspects of acids and bases.
Achievement with Excellence
Demonstrate comprehensive
understanding of aspects of acids and
bases.
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.
Pull out Resource Booklet 90944R from the centre of this booklet.
If you need more space for any answer, use the page(s) provided at the back of this booklet and clearly
number the question.
Check that this booklet has pages 2-10 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.
Not
Achieved
TOTAL
08
ASSESSOR' S USE ONLY
©New Zealand Qualifications Authority, 2014. All rights reserved.
No part of this publication may be reproduced by any means without the prior permission of the New Zealand Qualifications Authority.
3
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Write a word equation AND a balanced symbol equation for the reaction between calcium
carbonate and hydrochloric acid,
Word equation:
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6
QUESTION THREE: INDICATORS AND pH
ASSESSOR'S
USE ONLY
A student has three unlabelled beakers each containing a colourless liquid. One contains water, one
'contains a solution of baking soda (sodium hydrogen carbonate), and one contains white vinegar
(a solution of ethanoic acid).
To work out which liquid is which, the student put a drop from each beaker onto a piece of blue
litmus paper and a piece of red litmus paper. She then added universal indicator to each beaker.
The following results were obtained:
Colour of
blue litmus
paper
Colour.of
red litmus
paper
Colour with
universal
indicator
//-
//
stays blue
Beaker 1
stays red
tums green 1
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Name ofliquid
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Beaker 2
tums red
stays red
turns orangjo
Beaker 3
stays blue
turns blue
turns blue
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(a)
Comp lete the last column of the table above to identify the three l!qmas.
(b)
Use the infonnation in the table to show how each of the liquids can be identified.
In your answer you should:
use all of the observations for each beaker
state the approximate pH from the colour of the universal indicator.
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9
(c)
Explain the relationship between the changing pH of the solution and the ions in the solution
as the sulfuric acid is added to the beaker.
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