4472
0100
01
ADDITIONAL MATERIALS
In addition to this paper you will needa calculator and a ruler.
INSTRUCTIONS TO CANDIDATES
Use black ink or black ball-point pen.Write your name, centre number and candidate number in the spaces at the top of this page.Answer all questions.Write your answers in the spaces provided in this booklet.
INFORMATION FOR CANDIDATES
The number of marks is given in brackets at the end of each question or part-question.You are reminded of the necessity for good English and orderly presentation in your answers.Assessment will take into account the quality of written communication (QWC) in your answer to question 10.The Periodic Table is printed on the back cover of the examination paper and the formulae for some common ions on the inside of the back cover.
SM*(W14-4472-01)
Surname
Other Names
CandidateNumber
0
CentreNumber
© WJEC CBAC Ltd.
GCSE
4472/01
ADDITIONAL SCIENCE/CHEMISTRY
CHEMISTRY 2FOUNDATION TIER
A.M. TUESDAY, 14 January 2014
1 hour
For Examiner’s use only
Question MaximumMark
MarkAwarded
1. 6
2. 6
3. 4
4. 6
5. 7
6. 7
7. 8
8. 4
9. 6
10. 6
Total 60
2
(4472-01)
Examineronly
Answer all questions.
1. (a) The following diagrams represent five different atoms, A–E.
© WJEC CBAC Ltd.
BA C
D E
Use the diagrams to answer the following questions.
(i) Give the electronic structure of element D. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [1]
(ii) Give the letters, A–E, of the elements that are found in Period 3. [1]
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . and . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(iii) Give the letters, A–E, of the elements that are found in Group 7. [1]
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . and . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(iv) Give the atomic number of element C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [1]
(b) Complete the following table to show the relative masses and charges of the particles found in an atom. [2]
Particle Relative mass Relative charge
proton 1 . . . . . . . . . . . .
neutron. . . . . . . . . . . .
0
electron 0 −1
6
(4472-01) Turn over.
4472
0100
03
3Examiner
only2. A Group 1 metal is burned in a gas jar containing oxygen.
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oxygen
metal burning with a lilac flame
(a) Use the information in the diagram above to name the Group 1 metal. [1]
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(b) Write a word equation for the reaction taking place. [1]
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . + . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(c) Give the name of a Group 1 metal that would react less vigorously than the metal named in (a) above. [1]
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(d) A similar reaction can be carried out using chlorine instead of oxygen. The product obtained is a white solid.
(i) Choose from the box below a solution that could be used to show that the white solid contains chloride ions. [1]
limewater silver nitrate sodium hydroxide sulfuric acid
(ii) State what must be done to the white solid in order to carry out the test. [1]
(iii) Give the colour of the precipitate formed. [1]
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Solution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6
4
(4472-01)
Examineronly
3. Chromatography can be used to test if racehorses have been given illegal drugs. Urine samples from four horses, A–D, were tested to find out whether they contained caffeine or paracetamol. The following diagram shows the results obtained.
© WJEC CBAC Ltd.
0
2
4
6
8
10
1
3
5
7
9
(a) Give the letter of the horse, A–D, that had been given paracetamol. [1]
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(b) State, giving a reason, if any of the four horses had been given caffeine. [1]
(c) The Rf value can be used to identify a substance. Use the following equation to calculate the Rf value of paracetamol. [2]
Rf value = distance moved by solvent
Rf value = . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
Dis
tanc
e m
oved
(cm
)
start line
solvent front
para
ceta
mol
caffe
ine
hors
e A
hors
e B
hors
e C
hors
e D
distance moved by paracetamol
(4472-01) Turn over.
4472
0100
05
5Examiner
only4. The following graph shows how the solubility of four different substances varies with temperature.
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40
20
80
120
180
60
100
140
160
200 40 60 80
Sol
ubilit
y (g
per
100
g of
wat
er)
sodium sulfate
sodium chloride
sodium nitratepotassiu
m nitrate
Temperature (°C)
(a) Name the substance that shows the smallest change in solubility. [1]
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(b) Give the temperature at which the solubility of potassium nitrate and sodium nitrate is the same.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . °C [1]
(c) If a saturated solution of sodium nitrate in 100 g of water is cooled from 80 °C to 10 °C, calculate the mass of crystals that will be formed. [2]
Mass of crystals formed = . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . g
(d) Describe, using data from the graph, how the solubility of sodium sulfate changes with temperature. [2]
6
Name Molecular formula Structural formula Family of hydrocarbons
methane
butane C4H10 alkane
ethene C2H4
C3H6 alkene
6
(4472-01)
Examineronly
5. The following table shows some information about four organic compounds.
© WJEC CBAC Ltd.
C HH
H
H
C C
H
H
H
H
C CH C
HH H
H H
(a) Complete the table. [4]
(b) Ethene undergoes polymerisation to form polythene. The following equation shows the reaction taking place.
C C
H
H
H
H
C C
n
n
H
H
H
H
Describe what happens during this process. [2]
(4472-01) Turn over.
4472
0100
07
7Examiner
only (c) Another polymer is PTFE. Its repeating unit is shown below.
© WJEC CBAC Ltd.
C C
F F
F F n
Draw the structure of the monomer used to produce PTFE. [1]
7
8
(4472-01)
6. When sodium thiosulfate solution reacts with dilute acid, sulfur forms as a precipitate. The precipitate causes the solution to go cloudy. The rate of reaction can be measured by placing a cross beneath the flask and measuring the time taken for the cross to disappear.
© WJEC CBAC Ltd.
A pupil studied the effect of temperature on the reaction and obtained the following results.
Temperature (°C) 20 30 40 50 60
Time taken for cross to disappear (s) 50 32 25 20 17
add dilute acid and start timing
sodium thiosulfate solution
cross drawn on paper
(4472-01) Turn over.
9Examiner
only (a) (i) Plot the results on the grid below and draw a suitable line. [3]
© WJEC CBAC Ltd.
100
10
20
30
40
50
60
20 30 40 50 60 70
Tim
e ta
ken
for c
ross
to d
isap
pear
(s)
Temperature (°C)
(ii) Describe the trend in the results. [1]
(iii) A second student carried out the same experiment using a higher concentration of acid. Draw the line you would expect him to obtain on the same grid. [1]
10
(4472-01)
Examineronly
(b) Another student suggested using a light sensor and data logger to study the reaction rate.
© WJEC CBAC Ltd.
lightsource
light sensor
to data logger
reaction mixture
Describe how the light intensity detected by the sensor would change during the reaction and give one advantage of using a light sensor. [2]
7
(4472-01) Turn over.
11Examiner
only
© WJEC CBAC Ltd.
7. The following table shows information about some atoms, A–E.
A–E are not the chemical symbols for the elements.
Atom A B C D E
atomicnumber 3 6 10 11
massnumber 12 14 20 23
number of protons 3 6 6 10 11
number of neutrons 4 6 8 10
number of electrons 3 6 6 10 11
(a) Complete the table. [3]
(b) (i) Give the electronic structure of element D. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [1]
(ii) Use this information to explain why this element is found in Period 2 and Group 0. [2]
(c) Choose the letters, A–E, of the atoms that represent isotopes and give a reason for your choice. [2]
Letters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . and . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
12
(4472-01)
Examineronly
© WJEC CBAC Ltd.
8. The following diagrams show the structures of diamond, graphite and carbon nanotubes.
diamond graphite carbon nanotube
(a) Two of the structures shown above conduct electricity. Name both and give the reason why they are able to conduct electricity. [2]
Structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . and . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(b) Name the structure above that is used as a lubricant and give a reason why it is suitable for this use. [2]
4
(4472-01) Turn over.
13Examiner
only
© WJEC CBAC Ltd.
6
9. The reaction of chlorine with iron can be demonstrated using the following apparatus.
(a) State why the reaction should be carried out in a fume cupboard. [1]
(b) The product of the reaction above is iron(III) chloride, FeCl3. Complete and balance the following symbol equation for the reaction. [2]
(c) Calculate the percentage by mass of chlorine in iron(III) chloride, FeCl3. [3]
Ar (Fe) = 56 Ar (Cl) = 35.5
Percentage by mass of chlorine = . . . . . . . . . . . . . . . . . . . . . . . . . . %
excess chlorine gaschlorine gas
iron wool
. . . . . . . . . . . . . . . . . . . . . . . . . . + . . . . . . . . . . . . . . . . . . . . . . . . . . FeCl3
14
(4472-01)
Examineronly
© WJEC CBAC Ltd.
10. Thermochromic pigments, photochromic pigments and shape memory alloys are types of smart material.
Describe your understanding of smart materials. [6 QWC]
Your answer should include:
• what is meant by a smart material; • someexamplesofsmartmaterials,theirspecialpropertiesanduses.
END OF PAPER 6
Turn over.(4472-01)
15
FORMULAE FOR SOME COMMON IONS
POSITIVE IONS NEGATIVE IONSName Formula Name Formula
AluminiumAmmoniumBariumCalciumCopper(II)HydrogenIron(II)Iron(III)LithiumMagnesiumNickelPotassiumSilverSodiumZinc
Al3+
NH4+
Ba2+
Ca2+
Cu2+
H+
Fe2+
Fe3+
Li+
Mg2+
Ni2+
K+
Ag+
Na+
Zn2+
BromideCarbonateChlorideFluorideHydroxideIodideNitrateOxideSulfate
Br–
CO32–
Cl–
F–
OH–
I–
NO3–
O2–
SO42–
© WJEC CBAC Ltd.
(4472-01)
16
1 H
Hydr
ogen
4 H
e
Hel
ium
7 Li
Lith
ium
9 B
e
Bery
llium
11 B
Bor
on
12 C
Car
bon
14 N
Nitro
gen
16 O
Oxy
gen
19 F
Fluo
rine
20 N
e
Neo
n
23 N
a
Sod
ium
24 M
g
Magn
esium
27 A
l
Alumi
nium
28 S
i
Sili
con
31 P
Phos
phoru
s
32 S
Sulfu
r
35 C
l
Chlo
rine
40 A
r
Arg
on
39 K
Potas
sium
40 C
a
Cal
cium
45 S
c
Scan
dium
48 T
i
Tita
nium
51 V
Vana
dium
52 C
r
Chrom
ium
55 M
n
Mang
anes
e
56 F
e
Iron
59 C
o
Cob
alt
59 N
i
Nic
kel
64 C
u
Cop
per
65 Z
n
Zinc
70 G
a
Gal
lium
73 G
e
Germ
anium
75 A
s
Ars
enic
79 S
e
Selen
ium
80 B
r
Brom
ine
84 K
r
Kryp
ton
86 R
b
Rubid
ium
88 S
r
Stro
ntium
89 Y
Yttri
um
91 Z
r
Zirco
nium
93 N
b
Niob
ium
96 M
o
Molyb
denum
99 T
c
Tech
netiu
m
101 R
u
Ruthe
nium
103 R
h
Rhod
ium
106 Pd
Palla
dium
108 Ag
Silv
er
112 C
d
Cadm
ium
115 In
Indi
um
119 Sn Tin
122 Sb
Antim
ony
128 Te
Tellu
rium
127 I
Iodi
ne
131 Xe
Xeno
n
133 C
s
Caes
ium
137 Ba
Bar
ium
139 La
Lanth
anum
179 H
f
Hafn
ium
181 Ta
Tant
alum
184 W
Tung
sten
186 R
e
Rhen
ium
190 O
s
Osm
ium
192 Ir
Iridi
um
195 P
t
Plat
inum
197 Au
Gol
d
201 H
g
Mer
cury
204 Tl
Thall
ium
207 Pb
Lead
209 B
i
Bism
uth
210 Po
Polon
ium
210 At
Asta
tine
222 R
n
Rad
on
223 Fr
Fran
cium
226 R
a
Rad
ium
227 Ac
Actin
ium
3 11 19 37 55 87
2 86543618109
17 35
53 85
8 16 34 52 848315 33
7 51
6 14 32 50 82
5
13 31 49 81
30 48 80
29 47 79
28 46 78
27 45 77
26 44 76
1
25 43 75
24 42
74
23 41 73
22 40 72
21 39 57 89
4 12 20 38 56 88
PER
IOD
IC T
AB
LE O
F EL
EMEN
TS
12
Gro
up3
45
67
0
AX
Z Nam
e
Key:
Mas
s nu
mbe
r
Atom
ic n
umbe
rEl
emen
t Sym
bol
© WJEC CBAC Ltd.