Science
Stage 7
Paper 2
2024
45 minutes
No additional materials are needed.
INSTRUCTIONS
• Answer all questions.
• Write your answer to each question in the space provided.
• You should show all your working on the question paper.
INFORMATION
• The total mark for this paper is 50.
• The number of marks for each question or part question is shown in brackets [ ].
3144_02_4RP
© UCLES 2024
2
1
The diagram shows leaves from six different species of tree.
species A
species B
species C
species D
species E
species F
(a) Write down the meaning of the term species.
[2]
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(b) Look at the dichotomous key used to identify different species of tree.
Is the leaf divided
into many separate
parts?
yes
no
Are the separate
parts like needles?
Is the leaf round
in shape?
yes
no
yes
yew
rowan
alder
no
Does the leaf
have only one
pointed end?
yes
no
vine maple
................................................................
................................................................
................................................................?
..........................
..........................
eucalyptus
beech
(i) Use the key to identify species A.
Species A is
.
[1]
(ii) The dichotomous key is incomplete.
Species B is a eucalyptus tree.
Species C is a beech tree.
Complete the three empty boxes in the key.
[2]
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4
2
Metals and non-metals have different physical properties.
Complete the table about metals and non-metals.
physical property
metal
electrical conductivity
thermal conductivity
low
high
melting point
density
non-metal
low
high
[2]
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3
Gravity is a force.
(a) Mike wants to find out if the total mass of two objects affects the force between the objects.
Mike collects information from the internet about the:
• mass of two objects, A and B
• distance between these two objects
• force between these two objects.
He puts the information in a table.
mass of
object A
in kg
mass of
object B
in kg
distance between
object A and object B
in m
force between object
A and object B
in N
1
1
1
1
2
1
1
2
2
2
1
3
2
3
1
6
3
3
1
9
(i) Mike says,
'This is a fair test.'
Explain why this is a fair test.
Use information from the table.
[1]
(ii) Mike notices a mistake with one of the values for the force between objects in N.
This measurement should be 4 N.
Identify the incorrect value.
Explain your answer.
incorrect force between objects in N
N
explanation
[2]
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6
(b) Complete the sentence to describe gravity.
Choose from the list.
attraction
mass
repulsion
Gravity is the force of
weight
between two objects.
[1]
4
Several times a year there are solar eclipses on Earth.
B
Sun
A
Earth
C
D
NOT TO SCALE
Which position of the Moon causes a solar eclipse?
Circle the correct answer.
A
B
C
D
[1]
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5
The diagram shows part of an ocean food chain.
plankton
small fish
squid
whale
(a) Name a herbivore from the food chain.
[1]
(b) Penguins eat small fish.
Whales eat penguins.
Adding penguins to the food chain makes a food web.
Complete the diagram to make this food web.
plankton
small fish
squid
whale
[2]
(c) Microorganisms are also present in the ocean.
Some microorganisms are decomposers.
What is the function of a decomposer in a food web?
[1]
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8
6
Safia reacts some white solid calcium carbonate with dilute hydrochloric acid.
Carbon dioxide, water and a colourless solution of calcium chloride are made in the reaction.
(a) Suggest two observations Safia makes to confirm a chemical reaction takes place.
1
2
[2]
(b) During the reaction the dilute hydrochloric acid is neutralised.
Describe what happens to the pH of the dilute hydrochloric acid.
[1]
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7
Echolocation is used by bats to find their prey.
prey
bat
represents sound made by the bat
represents sound travelling towards the bat
(a) Explain how the bat uses echoes to find the prey.
[2]
(b) The prey moves closer to the bat.
Describe how the bat knows, using echoes, that the prey is closer.
[1]
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10
8
Rajiv uses fruits to model the Solar System.
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
(a) Write down two strengths of this model of the Solar System.
1
2
[2]
(b) Write down two limitations of this model of the Solar System.
1
2
[2]
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9
Three of the characteristics of living organisms are sensitivity, nutrition and movement.
(a) Draw a straight line to match each characteristic to its correct description.
characteristic
description
organisms take in and use nutrients
sensitivity
nutrition
organisms increase in number
organisms detect changes and
respond to them
organisms break down nutrients to
release energy
movement
organisms remove nutrients from
their bodies
organisms change their position
[3]
(b) Viruses cause disease.
(i) Write down one reason why some scientists think viruses are living.
[1]
(ii) Write down one reason why some scientists think viruses are non-living.
[1]
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12
10 Some chemical reactions make a precipitate.
Complete the sentence about reactions that make a precipitate.
A precipitate is made when two
reactants make at least one
product.
[2]
11 Blessy describes her electrical circuit.
My circuit is a complete series circuit with:
•
•
•
•
•
a battery of cells
two lamps
one closed switch
one buzzer
a meter to measure the current in the whole circuit.
Draw her circuit using standard electrical symbols.
The battery of cells has been drawn for you.
[4]
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12 The atmosphere contains a mixture of gases.
(a) What is the percentage by volume of nitrogen in clean dry air?
%
[1]
(b) What is the meaning of the word mixture?
[2]
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14
13 Carlos investigates the neutralisation reaction between an acid and an alkali.
In his first experiment Carlos:
•
•
•
•
•
adds 50 cm3 of acid to a beaker
measures the temperature of the acid
adds 10 cm3 of alkali to the acid
stirs the mixture
measures the highest temperature reached by the mixture.
Carlos repeats the first experiment four more times but uses different volumes of alkali.
Look at his results table.
volume of alkali
added
in cm3
temperature of
acid
in °C
highest
temperature of
mixture
in °C
change in
temperature
in °C
10
21
26
5
20
21
31
10
30
22
37
15
40
21
40
19
50
23
47
……………
(a) Name the equipment he uses to measure the temperature of the acid and the volume of the
acid.
temperature
volume
[2]
(b) Calculate the change in temperature when Carlos uses 50 cm3 of alkali.
Write your answer in the table.
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(c) Plot the results on the grid.
Include labels for the axes.
30
25
20
..............................
..............................
15
..............................
10
5
0
0
10
20
30
40
50
60
..............................................
..............................................
[2]
(d) Draw a straight line of best fit.
[1]
(e) Describe the pattern between the volume of alkali added and the change in temperature.
[1]
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14 Angelique investigates how objects fall.
Angelique:
• uses a magnet to attach an iron ball and a feather to the bottom of a lid
magnet
N
lid
S
feather
iron ball
• puts the lid on top of a tube to seal the tube
• removes the magnet so the ball and feather fall at the same time
• repeats this with different contents inside the sealed tube.
Angelique takes a photograph of each tube 0.5 s after the magnet is removed.
The position of the ball and feather in the photographs are shown in the diagrams.
A
© UCLES 2024
B
C
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17
(a) One tube is a vacuum, the other tubes contain either air or thick oil or water.
Complete the sentences.
Choose from the list.
air
thick oil
water
One has been done for you.
Tube A contains
.
Tube B is a vacuum.
Tube C contains
.
Tube D contains
.
[1]
(b) Explain the results for diagram B (the vacuum).
[2]
Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every
reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the
publisher will be pleased to make amends at the earliest possible opportunity.
To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge
Assessment International Education Copyright Acknowledgements Booklet. This is produced annually and is available to download at
https://lowersecondary.cambridgeinternational.org/
Cambridge Assessment International Education is part of Cambridge Assessment. Cambridge Assessment is the brand name of the University of Cambridge
Local Examinations Syndicate (UCLES), which is a department of the University of Cambridge.
© UCLES 2024
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© UCLES 2024
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calcium
40
38
Sr
strontium
88
56
Ba
barium
137
88
potassium
39
37
Rb
rubidium
85
55
Cs
caesium
133
87
actinoids
lanthanoids
–
Ca
K
–
actinoids
20
19
Ra
24
23
radium
magnesium
sodium
Fr
Mg
Na
francium
89–103
12
11
22
cerium
140
90
Th
thorium
232
lanthanum
139
89
Ac
actinium
–
231
protactinium
Pa
91
141
praseodymium
Pr
59
58
Ce
57
–
–
dubnium
Db
105
181
tantalum
Ta
73
93
niobium
Nb
41
51
vanadium
V
23
Cr
24
238
uranium
U
92
144
neodymium
Nd
60
–
seaborgium
Sg
106
184
tungsten
W
74
96
molybdenum
Mo
42
52
chromium
relative atomic mass
rutherfordium
Rf
104
178
hafnium
Hf
72
91
zirconium
Zr
40
48
titanium
Ti
La
lanthanoids
57–71
89
yttrium
Y
39
45
scandium
Sc
9
7
name
atomic symbol
Be
beryllium
Li
lithium
atomic number
4
3
Key
2
1
–
neptunium
Np
93
–
promethium
Pm
61
–
bohrium
Bh
107
186
rhenium
Re
75
–
technetium
Tc
43
55
manganese
Mn
25
–
plutonium
Pu
94
150
samarium
Sm
62
–
hassium
Hs
108
190
osmium
Os
76
101
ruthenium
Ru
44
56
iron
Fe
26
27
28
29
30
–
americium
Am
95
152
europium
Eu
63
–
meitnerium
Mt
109
192
–
curium
Cm
96
157
gadolinium
Gd
64
–
darmstadtium
Ds
110
195
platinum
Pt
Ir
iridium
78
106
palladium
Pd
46
59
nickel
Ni
77
103
rhodium
Rh
45
59
cobalt
Co
–
berkelium
Bk
97
159
terbium
Tb
65
–
roentgenium
Rg
111
197
gold
Au
79
108
silver
Ag
47
64
copper
Cu
–
californium
Cf
98
163
dysprosium
Dy
66
–
copernicium
Cn
112
201
mercury
Hg
80
112
cadmium
Cd
48
65
zinc
Zn
14
13
–
einsteinium
Es
99
165
holmium
Ho
67
–
nihonium
Nh
113
204
thallium
Tl
81
115
–
fermium
Fm
100
167
erbium
Er
68
–
flerovium
Fl
114
207
lead
Pb
82
119
tin
Sn
In
indium
50
73
germanium
Ge
32
28
silicon
49
70
gallium
Ga
31
27
aluminium
Si
12
11
Al
C
carbon
B
boron
–
mendelevium
Md
101
169
thulium
Tm
69
–
moscovium
Mc
115
209
bismuth
Bi
83
122
antimony
Sb
51
75
arsenic
As
33
31
phosphorus
P
15
14
nitrogen
N
7
–
nobelium
No
102
173
ytterbium
Yb
70
–
livermorium
Lv
116
–
polonium
Po
84
128
tellurium
Te
52
79
selenium
Se
34
32
sulfur
S
16
16
oxygen
O
8
–
lawrencium
Lr
103
175
lutetium
Lu
71
–
tennessine
Ts
117
–
astatine
At
85
127
iodine
I
53
80
bromine
Br
35
35.5
chlorine
Cl
17
19
fluorine
F
9
–
oganesson
Og
118
–
radon
Rn
86
131
xenon
Xe
54
84
krypton
Kr
36
40
argon
Ar
18
20
neon
Ne
10
4
6
5
helium
8
1
7
hydrogen
6
2
5
He
4
H
3
1
Group
The Periodic Table of Elements
18