WJEC 2014 Online Exam Review
GCSE Chemistry Unit 2 4472-01
All Candidates' performance across questions
Question Title
1
2
3
4
5
6
7
8
9
10
N
4801
4802
4800
4800
4802
4799
4741
4748
4779
4718
Mean
2.1
2.8
4.4
2.9
5.3
3.4
1.8
2.3
2.2
2.4
SD
0.9
1.1
1.8
1.3
1.7
1.6
1.3
1.2
1.3
1.4
Max Mark
3
4
7
5
10
7
5
6
7
6
FF
71.7
69
62.6
57.8
52.9
48.8
35.4
37.6
30.7
40.6
Attempt %
100
100
100
100
100
99.9
98.7
98.9
99.5
98.3
Question
GCSE Chemistry Unit2 4472-01
10
9
8
7
6
5
4
3
2
1
40.6
30.7
37.6
35.4
48.8
52.9
57.8
62.6
69
71.7
0
10
20
30
40
50
60
Facility Factor %
70
80
90
100
5
9
10
8
Examiner
only
5.(a)Zinc reacts with dilute hydrochloric acid to produce hydrogen gas.
The diagram below shows apparatus that can be used to investigate the rate of the
reaction between zinc and hydrochloric acid. A small amount of copper sulfate is added
because it acts as a catalyst for the reaction.
bung
gas syringe
flask
bubbles of hydrogen
hydrochloric acid
zinc
A few pieces of zinc were placed in excess dilute hydrochloric acid and the volume of
hydrogen produced was recorded every 10 seconds. The experiment was carried out at
room temperature. The results obtained are shown below.
Time (s)
0
10
20
30
40
50
60
70
Volume of hydrogen
(cm3)
0
8
33
40
45
48
49
49
(i)
All the results were measured accurately but the volume recorded after 10 seconds
is lower than expected. Suggest a possible reason for this.
[1]
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(ii)Plot all the results from the table on the grid below and draw a suitable line.
[3]
Examiner
only
50
40
30
Volume of
hydrogen
(cm3)
20
4 472
010 0 0 9
10
0
0
10
20
30
40
50
60
70
Time (s)
(iii) Use your graph to give the volume of hydrogen expected after 10 seconds.
[1]
3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . cm
(iv) State how the graph shows that the reaction has stopped.
[1]
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(ii)
Plot all the results from the table on the grid below and draw a suitable line.
[3]
Examiner
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Volume of
hydrogen
(cm )
3
o
Time (s)
Use your graph to give the volume of hydrogen expected after 10 seconds.
[1]
cm^
(iv)
State how the graph shows that the reaction has stopped.
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Examiner
(ii)
Plot all the results from the table on the grid below and draw a suitable line.
50
—
L
40
—
*
Volume of
hydrogen
(cm )
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1
10
.
_
I
i
0
1
-
!
r
-
L
10
20
1
30
40
50
60
70
Time (s)
(iii)
Use your graph to give the volume of hydrogen expected after 10 seconds.
[1]
cm^
(iv)
State how the graph shows that the reaction has stopped.
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Time (s)
(iii)
Use your graph to give the volume of hydrogen expected after 10 seconds.
^ X
(iv)
cm
3
State how the graph shows that the reaction has stopped.
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16
9.
The table below shows the amount of soap solution required by different samples of water to
form a permanent lather. In each case 25 cm3 of the water samples were used and the soap
solution was added 1 cm3 at a time.
Volume of soap solution added (cm3)
Sample
distilled water
A
B
C
A after boiling
B after boiling
C after boiling
Test 1
2
8
11
15
8
6
2
Test 2
2
8
18
14
7
5
2
Test 3
2
9
12
14
9
6
2
Test 4
2
7
13
13
8
7
2
Mean
2
8
14
8
6
2
(a)
Two pupils, David and Haf, calculated the mean value for sample B. David calculated a
value of 13.5 and Haf calculated a value of 12. Show how both values were obtained.
State which is the better value to use and give a reason for your choice.
[3]
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Examiner
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16
T h e table below s h o w s the a m o u n t o fs o a p solution required b ydifferent s a m p l e s o f water t o
f o r m a p e r m a n e n t lather. I n e a c h c a s e 2 5 c m o f t h e w a t e r s a m p l e s w e r e u s e d a n d the s o a p
solution w a s added 1 c m ata time.
3
3
3
V o l u m e o fsoap solution added (cm )
Sample
Test 1
Test 2
Test 3
Test 4
Mean
distilled w a t e r
2
2
2
2
2
A
8
8
9
7
8
B
11
18
12
13
\-Z-
C
15
14
14
13
14
A after boiling
8
7
9
8
8
B after boiling
6
5
6
7
6
C after boiling
2
2
2
2
2
(a)
T w o pupils, David and Haf, calculated the m e a n value for s a m p l e B . David calculated a
value o f 13.5 and Haf calculated a value o f 12. S h o w h o w both values w e r e obtained.
State which isthe better value t o u s e and give a reason for your choice.
[3]
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Examiner
only
16
T h e table below s h o w s the a m o u n t o fs o a p solution required b ydifferent s a m p l e s o f water t o
f o r m a p e r m a n e n t lather. I n e a c h c a s e 2 5 c m o f t h e w a t e r s a m p l e s w e r e u s e d a n d the s o a p
solution w a s added 1 c m ata time.
3
3
3
V o l u m e o fsoap solution added (cm )
Sample
Test 1
Test 2
Test 3
Test 4
Mean
distilled w a t e r
2
2
2
2
2
A
8
8
9
7
8
B
11
18
12
13
\-Z-
C
15
14
14
13
14
A after boiling
8
7
9
8
8
B after boiling
6
5
6
7
6
C after boiling
2
2
2
2
2
(a)
T w o pupils, David and Haf, calculated the m e a n value for s a m p l e B . David calculated a
value o f 13.5 and Haf calculated a value o f 12. S h o w h o w both values w e r e obtained.
State which isthe better value t o u s e and give a reason for your choice.
[3]
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Examiner
only
16
Examiner
9.
T h e table below s h o w s t h e a m o u n t o f soap solution required b y different s a m p l e s o fwater t o
f o r m a p e r m a n e n t lather. In e a c h c a s e 2 5 c m o f t h e w a t e r s a m p l e s w e r e u s e d a n dt h e s o a p
solution w a s added 1c m ata time.
3
3
3
V o l u m e o f soap solution added ( c m )
Sample
Test 1
Test 2
Test 3
Test 4
Mean
distilled w a t e r
2
2
2
2
2
A
8
8
9
7
8
B
11
18
12
13
C
15
14
14
13
14
A after boiling
8
7
9
8
8
B after boiling
6
5
6
7
6
C after boiling
2
2
2
2
2
(a)
T w o p u p i l s , D a v i d a n d H a f , c a l c u l a t e d t h e m e a n v a l u e f o r s a m p l e B. D a v i d c a l c u l a t e d a
value o f 13.5 a n d H a f calculated a value o f 12. S h o w h o w both values w e r e obtained.
State which ist h e better value t o u s e a n d give a reason for your choice.
[3]
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T h e table below s h o w s the a m o u n t o f s o a p solution required b y different s a m p l e s o f water t o
f o r m a p e r m a n e n t lather. I n e a c h c a s e 2 5 c m o f t h e w a t e r s a m p l e s w e r e u s e d a n d t h e s o a p
solution w a s added 1 c m at a time.
Examiner
only
3
3
3
V o l u m e of soap solution added (cm )
Sample
distilled w a t e r
A
B
C
A after boiling
B after boiling
C after boiling
(a)
Uj-
Test 1
2
8
11
15
8
6
2
..1<JL
Test 4
2
7
13
13
8
7
2
Test 3
2
9
12
14
9
6
2
Mean
2
8
lift*
14
8
6
2
T w o p u p i l s , D a v i d a n d H a f , c a l c u l a t e d t h e m e a n v a l u e f o r s a m p l e B. D a v i d c a l c u l a t e d a
value o f 13.5 a n d H a f calculated a value o f 12. S h o w h o w both v a l u e s w e r e obtained.
S t a t e w h i c h is t h e better v a l u e t o u s e a n d give a r e a s o n for y o u r choice.
[3]
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Examiner
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10. An atom of element E is represented as follows.
35
17
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State and explain what information this gives you about element E.
You may wish to refer to the key on the Periodic Table to help you answer this question. [6 QWC]
END OF PAPER
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17
Examiner
only
10. An atom of element E is represented as follows.
35
17
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State and explain what information this gives you about element E.
You may wish to refer to the key on the Periodic Table to help you answer this question. [6 QWC]
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Examiner
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10. An atom of element E is represented as follows.
35
17
E
State and explain what information this gives you about element E.
You may wish to refer to the key on the Periodic Table to help you answer this question. [6 QWC]
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