1
INTRODUCING SCIENCE
1
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Introducing Science
S ECTIONAL E XERCISE
1.1 Learning about science
Sectional Exercise
efer to Textbook
p.4–15
A. True or false (4 marks)
Write ‘T’ for a true statement and ‘F’ for a false statement.
1.
The study of the cause of flu is related to medicine.
2.
Scientific discoveries and inventions are always good for humans.
3.
Renewable resources can be replenished continuously in Nature.
4.
The problem of war can be solved using scientific knowledge.
Integrated Exercise
B. Fill in the blanks (5 marks)
1.
The study of phenomena and events in Nature through systematic (a)
(b)
is called science. The people who work in science are called
(c)
2.
and
.
Scientific
such as computers and smartphones have greatly improved the
quality of our lives.
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3.
example, the fact that the Earth is a sphere.
C. Multiple-choice (5 marks)
Choose the correct answer for each question.
1.
2
Besides scientific inventions, scientists have made many scientific
Which of the following questions CANNOT be answered by science?
A.
Why does an apple fall to the ground?
B.
Can we live on Mars?
C.
How can we make a good friend?
D.
When will fossil fuels be exhausted?
, for
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Introducing Science
Which of the following is NOT a scientific invention?
Vaccine C.
Microwave oven B.
Wi-Fi
D. DNA
4.
5.
Which of the following combinations about the scientist and his/her contribution is correct?
Scientist
Contribution
A.
Charles Kao
Invented optical fibres
B.
Marie Curie
Invented light bulbs
C.
Charles Darwin
Developed the theory of relativity
D.
Albert Einstein
Discovered the force of gravity
Which of the following is/are example(s) of renewable resources?
(1)
Metal ores
(2)
Water
(3)
Air
(4)
Plants
A.
(1) only
B.
(1) and (2) only
C.
(2) and (3) only
D.
(2), (3) and (4) only Integrated Exercise
3.
Sectional Exercise
A.
Spelling Corner
2.
1
In the past, people lived in very crowded conditions and they thought that bad smell and air
caused diseases. After microorganisms were discovered, people know that many diseases are
actually caused by microorganisms. This shows that
A.
the cause of diseases is bad smell and air.
B.
scientific knowledge is subject to change.
C.
people have become cleverer.
D.
the living conditions in the past were bad.
3
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1
Introducing Science
D. Questions (9 marks)
1.
Name the branch of science related to each question below.
(6 marks)
Sectional Exercise
(a)
(b)
(c)
What is the inside structure of the
Earth?
Why does an apple turn brown
when it is cut open?
Why are some stars brighter than
the others?
The branches of science
Integrated Exercise
EM
ST
2.
(d)
(e)
(f)
Why can a ship float in water?
Are corals plants or animals?
How can we treat AIDs?
A self-driving car is a new technology that has been
developed in recent years. It has sensors, radar, GPS, etc.
After getting in the car, the ‘driver’ can simply pick a
Spelling Corner
destination and then he/she can sit back, relax and let the
car handle all the driving and even parking.
What are the advantages and disadvantages of self-driving cars? Write A if it is an advantage
and D if it is a disadvantage.
(i)
Fewer traffic accidents
(3 marks)
(ii)
Very expensive
(iii) May cause traffic congestion
(iv) Fewer driving errors
(v)
(vi) Loss of privacy as your movements
Easy for parking
can be tracked
Total Score : / 23
4
coral 珊瑚
sensor 感應器
radar 雷達
GPS 全球定位系統
congestion 擠塞
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Introducing Science
1.2 Practice of science
1
efer to Textbook
p.16–24
A. True or false (3 marks)
All scientific investigations involve designing and doing experiments.
2.
Model building is a type of scientific investigation.
3.
In a fair test, the variable that we are going to change is called the dependent variable.
B. Fill in the blanks (6 marks)
1.
The steps in a scientific investigation are shown below:
(a)
Form a
Design and do
(b)
(c)
Draw a
Analyse
(d)
2.
is a type of scientific investigation which involves comparing the
Integrated Exercise
1.
Sectional Exercise
Write ‘T’ for a true statement and ‘F’ for a false statement.
3.
In science,
can represent objects that are too small or too big to see.
They are usually used to show the structures of objects.
C. Multiple-choice (7 marks)
Choose the correct answer for each question.
1.
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similarities and differences between objects, and sorting them into groups.
When experimental results do not support the hypothesis, scientists will first
A.
slightly modify the results to make them support the hypothesis.
B.
repeat the experiment to make sure there are no mistakes in the procedure.
C.
form a new hypothesis and design another experiment.
D.
copy other scientists’ results.
5
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Introducing Science
2.
Study the following figure.
A
C
Some new leaves
have formed.
Sectional Exercise
B
D
The birds are singing.
The fresh air contains
oxygen.
Which of the above statements is NOT an observation?
3.
Which of the following statements about evidence in science is INCORRECT?
A.
Evidence in science usually does not come from experiments.
B.
If enough evidence is collected in experiments, the hypothesis becomes acceptable
Integrated Exercise
scientific knowledge.
4.
C.
Science is based on evidence.
D.
Evidence in science can be observations and data in experiments.
Amy hears that mixing used tea leaves with soil can help with plant growth. She wants to
design an experiment to test if this is true. Which of the following shows a correct set-up for
her experiment?
A.
B.
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soil mixed with
used tea leaves
soil mixed with
used tea leaves
C.
soil mixed with
used tea leaves
D.
soil without
tea leaves
oxygen 氧
6
The water in the
fountain is cool.
soil mixed with
used tea leaves
from Brand P
soil mixed with
used tea leaves
from Brand Q
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Introducing Science
1
Directions: Questions 5 to 7 refer to the following description about performing a fair test
with okra.
Okra is said to help reduce the blood cholesterol level. A doctor carries out a fair test to find out
whether okra has such effect. He finds two groups of people with high blood cholesterol levels.
6.
7.
Which of the following is the independent variable in this fair test?
A.
Age of the people
B.
Gender of the people
C.
Whether there is okra in their meals
D.
The blood cholesterol levels of the people
At the end of the fair test, what should the doctor measure?
A.
The amounts of okra the people eat
B.
The sizes of okra the people eat
C.
The number of people in each group
D.
The blood cholesterol levels of the people
Why does the doctor carry out the test with two groups of people instead of two people?
(1)
This allows the people to communicate how to eat the okra.
(2)
This can reduce errors due to individual differences.
(3)
The result will be more reliable.
A.
(1) and (2) only
B.
(1) and (3) only
C.
(2) and (3) only
D.
(1), (2) and (3)
okra 秋葵
cholesterol 膽固醇
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5.
Integrated Exercise
Sectional Exercise
One group have okra in their meals every day, and the other group without okra.
gender 性別
7
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Introducing Science
D. Questions (4 marks)
1.
The screens of smartphones often break when the smartphones are accidentally dropped onto
the ground. Tom is curious about which brand of smartphone has a more impact-resistant
screen. He collects different brands of smartphones and performs a test:
Sectional Exercise
Step 1: He throws the smartphone one by one
up to the sky and let it drop onto the
ground.
Step 2: He observes and compares the levels
of damage of the screens.
Integrated Exercise
(a)
Write down the independent variable (the only variable that is changed) and dependent
variable (the variable to be measured) in Tom’s test.
(2 marks)
Spelling Corner
Independent variable:
Dependent variable:
(b)
Give TWO reasons why Tom’s test is unfair.
(2 marks)
He throws the smartphones one by one to the sky and let them drop onto the ground.
Therefore,
•
the
•
the
each smartphone reaches before dropping is different.
at which each smartphone hits the ground is
different.
Total Score : / 20
impact-resistant 防撞的
8
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1
Introducing Science
1.3 Laboratory safety
efer to Textbook
p.24–36
A. True or false (5 marks)
1.
We should wear safety goggles before entering the laboratory.
2.
We should read safety precautions before doing an experiment.
3.
Notes and textbooks should be kept away from flames.
4.
We should avoid shock when handling explosive chemicals.
5.
A water-type fire extinguisher can put out all kinds of fires.
Sectional Exercise
Write ‘T’ for a true statement and ‘F’ for a false statement.
B. Multiple-choice (5 marks)
Choose the correct answer for each question.
Integrated Exercise
Directions: Questions 1 and 2 refer to the description below.
The hazard warning symbol shown below is found on a bottle of insect killer.
2.
The chemical inside the bottle is
A.
irritant.
B.
corrosive.
C.
flammable.
D.
explosive.
According to the hazard warning symbol, what safety precautions should be taken when
Spelling Corner
1.
using the insect killer?
(1)
Wear gloves.
(2)
Avoid shock.
(3)
Keep the bottle of insect killer away from heat and flames.
A.
(1) only
B.
(3) only
C.
(1) and (2) only
D.
(1), (2) and (3)
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1
Introducing Science
3.
Which of the following experiments should be carried out in a fume
cupboard?
Sectional Exercise
4.
5.
A.
Mixing water with alcohol
B.
Handling corrosive chemicals
C.
Heating a test tube of water
D.
Observing a burning candle
If chemicals accidentally get into the eyes when we are doing an experiment, we should
A.
keep calm and continue the experiment.
B.
ask a classmate to get a bottle of eye drop for you.
C.
find a first-aid box and look for suitable medicine.
D.
wash the eyes with the distilled water from an eye wash bottle.
Which of the following is NOT a condition for a fire to start?
Integrated Exercise
(1)
Dryness
(2)
High temperature
(3)
Fuel
(4)
Oxygen
A.
(1) only
B.
(2) only
C.
(1) and (3) only D.
(1) and (4) only
C. Questions (13 marks)
1.
As shown below, Amy and Kate are heating a liquid in the laboratory.
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Amy
(a)
10
Kate
Amy and Kate make THREE mistakes in the experiment. Circle the mistakes. (3 marks)
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Introducing Science
(b)
1
Amy accidentally touches the boiling tube and gets a heat burn on her fingers. She drops
the boiling tube on the bench. The boiling tube breaks and the water inside splashes
over the bench.
(i)
To treat the heat burn, what should Amy do immediately?
(1 mark)
She should place her fingers
•
She should keep calm and
•
She should
2.
with a brush
carefully and dispose of them in a
The steps of using a fire extinguisher are listed below. Arrange them in the correct order. (4 marks)
(a)
Squeeze the handle.
(b)
Aim at the lowest part of the fire.
(c)
Sweep from side to side until the fire is put out.
(d)
Pull the safety pin.
Correct order:



A child played with a fuel lighter and accidentally burned his clothes. His father wrapped him
in a wet blanket at once and the fire was put out. The child was sent to hospital afterwards.
Spelling Corner
3.
(3 marks)
Sectional Exercise
Describe how Kate should handle the accident.
Integrated Exercise
(ii)
Briefly explain how the fire was put out using a wet blanket.
of the burning clothes and stops
The wet blanket
the
(2 marks)
supply to the fire.
Total Score : / 23
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1
Introducing Science
Laboratory apparatus
1.4
efer to Textbook
p.37–41
A. True or false (3 marks)
Write ‘T’ for a true statement and ‘F’ for a false statement.
Sectional Exercise
1.
A spatula is used to transfer a small amount of solid.
2.
All laboratory apparatus is made of glass.
3.
When drawing a vertical section diagram, we should shade the diagram to represent
the parts that are darker in colour.
B. Multiple-choice (3 marks)
Choose the correct answer for each question.
1.
Integrated Exercise
2.
Which of the following apparatus should be used to stir a hot liquid?
A.
Glass rod
B.
Spatula
C.
Dropper
D.
Thermometer
Which of the following apparatus should be used to measure out 15 cm3 of liquid?
A.
B.
C.
D.
100
100
200
50
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80
100
60
40
3.
Which of the following is the vertical section diagram of a conical flask?
A.
B.
C.
12
D.
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Introducing Science
1
C. Questions (29 marks)
The diagram below shows some laboratory apparatus and safety equipment.
T
U
L
F
M
Sectional Exercise
B
G
C
H
N
I
O
J
D
E
K
P
Q
(a)
S
R
Name each laboratory apparatus and equipment.
(21 marks)
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
(b)
The table below lists the uses of some of the above apparatus and equipment. Complete
the table with suitable letters. The first one has been done for you as an example. Use
To transfer a small amount of liquid
(4 marks)
Integrated Exercise
A
Spelling Corner
1.
Apparatus/Equipment
D
To heat substances
To hold hot objects
To hold a test tube when heating
To protect your eyes
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Introducing Science
(c)
Draw the vertical section diagram of each apparatus below.
(4 marks)
Apparatus
Sectional Exercise
Vertical section
diagram
Integrated Exercise
Total Score : / 35
Using measuring instruments
1.5
efer to Textbook
p.42–59
Spelling Corner
A. Fill in the blanks (6 marks)
1.
We use a (a)
to measure the volume of a liquid. To
take an accurate reading, our eyes should be at the same level as the bottom of the
(b)
.
2.
In the laboratory, we usually use a
3.
We can use a
(a)
to measure the mass of an object.
to measure temperature. We can also measure
temperature with a temperature sensor connected to a (b)
Temperature is usually measured in (c)
14
(°C).
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Introducing Science
1
B. Multiple-choice (7 marks)
Choose the correct answer for each question.
3.
14.3 cm
B.
14.4 cm
C.
14.6 cm
D.
14.7 cm
Sectional Exercise
A.
Which of the following units is NOT a unit of volume?
A.
cm3
B.
L
C.
mg
D.
mL
The volume of the drink carton package shown on the right is
6.5 cm
4 cm
250 cm . The height of the carton package is about
3
4.
A.
10.6 cm.
B.
9.6 cm.
C.
80 mm.
D.
100 mm. Which of the following is an advantage of using an electronic
balance?
A.
It gives precise measurements.
B.
It is less expensive.
C.
It can measure heavier objects.
D.
It is a more advanced instrument.
height
Integrated Exercise
2.
What is the length of the pen below?
Spelling Corner
1.
15
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Introducing Science
5.
6.
The apparatus shown in the photo is a
A.
lever balance.
B.
triple beam balance.
C.
top pan balance.
D.
spring balance. Which of the following diagrams shows the correct way to measure the temperature of the
Sectional Exercise
liquid with a thermometer?
A.
B.
C.
D.
Integrated Exercise
7.
Temperature can be measured in degrees Celsius (°C) or in degrees Fahrenheit (°F). The photo
below shows a thermometer with both scales.
Spelling Corner
When the temperature is 0 °C, the temperature in degrees Fahrenheit will be
A.
–18 °F.
B.
25 °F.
C.
32 °F.
D.
80 °F. Fahrenheit 華氏
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Introducing Science
1
C. Questions (14 marks)
1.
(a)
Draw a meniscus to represent the given
volume. (1 mark)
(b)
Draw a liquid column to represent
the given temperature.
(1 mark)
thermometer
measuring cylinder
60
Temperature = 38 °C
20
Volume = 27 cm3
A student measures the volume of a stone using the method shown below.
stone
Integrated Exercise
2.
displacement can
water
cm3
20
cm3
20
lower the stone into the
displacement can
10
10
(a)
What is the volume of the stone?
(1 mark)
(b)
When taking the reading, the student should place the measuring cylinder on the bench,
instead of holding it in his/her hands. Briefly explain why.
The student can take a more (i)
Sectional Exercise
30
(3 marks)
Spelling Corner
70
reading by placing the measuring
cylinder on the bench or any other (ii)
surface, because it is easier for
him/her to read the bottom of the (iii)
.
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1
Introducing Science
3.
Leo uses the instrument shown on the right to measure
the net mass (i.e. the mass without the container) of a
bottle of soft drink.
(a)
Name the instrument. (1 mark)
(b)
Describe how he can measure the net mass of the bottle of soft drink.
Sectional Exercise
Put an (i)
(3 marks)
on the instrument and press the
(ii)
to set the reading to zero. Then, pour
(iii)
into the beaker to
directly measure the mass of the soft drink.
4.
Amy tries to measure the time for one complete swing of a ball (i.e. swinging from P to Q,
and then back to P). She measures the time taken for 10 swings and then divides the time
taken by 10 in order to find the time for one single swing.
Integrated Exercise
string
P
Spelling Corner
Time for 10 swings (s)
Q
Trial 1
Trial 2
Trial 3
Trial 4
25.5
25.0
24.5
23.0
(a)
What instrument should Amy use to measure time?
(b)
Calculate the average time for one single swing of the ball.
(1 mark)
(2 marks)
Average time for 10 swings =
Average time for 1 swing =
(c)
Why does Amy carry out several trials instead of one?
(1 mark)
Total Score : / 27
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Introducing Science
1.6 Basic practical skills
1
efer to Textbook
p.59–68
A. True or false (4 marks)
Write ‘T’ for a true statement and ‘F’ for a false statement.
1.
To save chemicals, excess unused solution should be poured back into the reagent
2.
We should close the air hole before lighting the Bunsen burner.
3.
The non-luminous flame is hotter than the luminous flame.
4.
If strike back occurs, we should close the air hole of the Bunsen burner immediately.
B. Multiple-choice (5 marks)
Choose the correct answer for each question.
When transferring a large amount of solution from a reagent bottle to a boiling tube,
A.
we can pour it out directly.
B.
we should use a dropper to transfer it carefully.
C.
we should ask for teacher’s assistance.
D.
we should first pour it out into a beaker and then transfer it from the beaker to the
boiling tube using a dropper.
Which of the following is NOT a correct way to mix solutions?
A.
B.
C.
D.
Spelling Corner
2.
Integrated Exercise
1.
Sectional Exercise
bottle.
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1
Introducing Science
3.
The diagrams below show the steps in using a dropper to transfer a solution.
p
q
r
s
squeeze
Sectional Exercise
empty test
tube
solution
Which of the following shows the steps in the correct order?
Integrated Exercise
4.
Spelling Corner
5.
A.
rspq
B.
rpsq
C.
prsq
D.
p  s  r  q
When we use a Bunsen burner to heat substances in the laboratory, we should
(1)
fully open the air hole.
(2)
wear safety goggles.
(3)
not touch the chimney.
(4)
put a heat-proof mat under the Bunsen burner.
A.
(1) and (2) only B.
(2) and (3) only
C.
(2), (3) and (4) only
D.
(1), (2), (3) and (4)
Which of the following shows the most suitable way to heat a small amount of water in a
boiling tube?
A.
B.
20
C.
D.
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Introducing Science
1
C. Questions (17 marks)
1.
Label different parts of the Bunsen burner in the diagram below.
(5 marks)
(c)
Sectional Exercise
(a)
(d)
(b)
Draw the Bunsen flames in the diagrams below and complete the table.
(12 marks)
Air hole is closed
Air hole is open
air hole is
closed
air hole is
open
Shape (regular/irregular)
Colour (yellow/blue)
Spelling Corner
2.
Integrated Exercise
(e)
Temperature (higher/lower)
Brightness (luminous/non-luminous)
Noise level (quiet/noisy)
Total Score : / 26
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1
Introducing Science
I NTEGRATED E XERCISE
A. True or false (8 marks)
Write ‘T’ for a true statement and ‘F’ for a false statement.
Sectional Exercise
1.
When carrying out a fair test, we should keep all variables the same.
2.
If an investigation is not a fair test, no conclusion can be drawn.
3.
Fair test is the only type of scientific investigation.
4.
Oxygen is necessary for a fire to start.
5.
Water type fire extinguishers can be used on fires caused by burning oil.
6.
An evaporating dish is used for holding a small amount of liquid.
7.
We should draw vertical section diagrams with a blue ball pen.
8.
We can use a coloured alcohol thermometer to measure the temperature of boiling
water.
Integrated Exercise
B. Multiple-choice (10 marks)
Choose the correct answer for each question.
1.
Spelling Corner
2.
Which of the following questions CANNOT be answered by science?
(1)
Does water boil at a higher temperature when table salt is added?
(2)
Does brand X battery have a longer life than brand Y battery?
(3)
Will your class win the football match tomorrow?
A.
(1) only B.
(3) only
C.
(1) and (2) only
D.
(2) and (3) only
The photo shows Peter’s birthday gift received from his
parents. Peter tries to observe and guess what the gift is
without opening the box. Which of the following is NOT
an observation?
22
A.
The gift is heavy in weight.
B.
The size of the gift is larger than his hands.
C.
The gift may be a camera.
D.
The gift is not attracted by a magnet.
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1
Introducing Science
3.
The photos below show two different types of flies.
head
abdomen
wing
Which of the following are differences between them?
5.
(2)
Markings on the thorax
(3)
Markings on the abdomen (4)
Number of wings A.
(1) and (2) only
B.
(2) and (3) only
C.
(1), (2) and (3) only
D.
(2), (3) and (4) only
Integrated Exercise
Appearance of the head What is the use of the apparatus shown on the right?
A.
To transfer a small amount of liquid
B.
To transfer a small amount of powder
C.
To stir a solution
D.
To mix two kinds of liquids
What is the volume of the water in the measuring cylinder (in mL) shown below?
A.
50 mL
B.
51 mL
C.
5.0 mL
D.
5.1 mL
thorax 胸
abdomen 腹
Spelling Corner
4.
(1)
Sectional Exercise
thorax
23
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1
Introducing Science
6.
What is the reading of the thermometer shown on
the right?
A.
39.4 °C B.
39.5 °C
C.
39.6 °C
D.
39.8 °C
Sectional Exercise
Directions: Questions 7 and 8 refer to the following information.
After a smartphone battery is fully charged, the actual power available may not be 100%. The
power available from a smartphone battery varies with temperature. The graph below shows the
actual powers available from a smartphone battery at three different temperatures.
100%
Integrated Exercise
75%
Actual power available (%)
50%
25%
0%
25
Spelling Corner
7.
8.
24
0
–20
Temperature (°C)
What is the actual power available from a smartphone battery at 0 °C?
A.
75%
B.
45%
C.
33%
D.
12%
Which of the following can be inferred from the above data?
A.
Temperature affects the power available from a smartphone battery.
B.
Temperature has no effect on the power available from a smartphone battery.
C.
The actual power available from a smartphone battery is highest at –20 °C.
D.
A smartphone battery can be used for a shorter time at higher temperatures.
All answers
Introducing Science
9.
1
Joe wants to carry out a test to find out how the original length of a spring affects its stretched
length when a weight is hung at the end. Which pair(s) of springs below can he use to carry
P and S
(2)
P and R
(3)
Q and S (4)
Q and R
A.
(1) only
B.
(4) only
C.
(2) and (3) only
D.
(2) and (4) only
R
S
Integrated Exercise
(1)
Q
10. When the air hole of a Bunsen burner is closed,
A.
the flame is hotter.
B.
the flame is luminous.
C.
the flame is blue in colour.
D.
the flame has a regular shape.
C. Questions (32 marks)
1.
What unit will you use for each measurement below? Write the symbol of the unit.
(a)
Length of the Great Wall of China
(b)
Duration of a flight from Hong Kong to London
(c)
Volume of a can of soft drink
(d)
Temperature of a glass of iced water
(e)
Mass of a tennis ball
(5 marks)
Spelling Corner
P
Sectional Exercise
out the test?
25
All answers
1
Introducing Science
2.
Classify the following natural resources into renewable and non-renewable resources.
plants
metal ores
(6 marks)
animals
Renewable resources
Sectional Exercise
3.
fossil fuels
air
Non-renewable resources
The pictures below show the story of the development of vaccine by Dr. Jenner (1749–1823).
Arrange the pictures in the correct order, and write the step in a scientific investigation
represented by each picture.
Correct order:
i
➔
(6 marks)
➔
Integrated Exercise
I’m right. People who have
caught cowpox before have
an ability to fight against
smallpox.
➔
ii
Milkmaids who have caught
cowpox before seldom caught
smallpox.
Spelling Corner
iii
iv
Perhaps people who have
caught cowpox before
have an ability to fight
against smallpox.
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water
cowpox 牛痘
milkmaid 擠奶女工
smallpox 天花
pus 膿
Dr. Jenner put some
pus from a person who
had cowpox into a
boy’s body. The boy
suffered from cowpox
but got well after a few
days. Then, Dr. Jenner
put some smallpox pus
into the boy’s body.
However, the boy did
not catch smallpox.
All answers
Introducing Science
Draw the vertical section diagram of the experimental set-up shown below. Label all the
Sectional Exercise
(8 marks)
Integrated Exercise
apparatus in the diagram.
Spelling Corner
4.
1
27
All answers
1
Introducing Science
5.
Karen sees the advertisement of a desiccant in a magazine.
SUPER BRAND
DESICCANT
SUPER BRAND
Sectional Exercise
Don’t miss the most effective
desiccant in this humid spring!!
Buy now to enjoy
10% off
Karen wants to compare the water-absorbing ability of Super Brand desiccant with three other
brands of desiccant. She designs the experimental set-up as shown below.
Integrated Exercise
box
50 cm3 of
water
100 g Super Brand desiccant
50 cm3 of
water
100 g Brand P desiccant
Spelling Corner
box
box
40 cm3 of
water
50 g Brand Q desiccant
(a)
desiccant 乾燥劑
28
box
50 cm3 of
water
100 g Brand R desiccant
Karen’s experiment is not a fair test. Briefly explain why.
•
The
•
The
(2 marks)
in the beakers are different.
on the watch glasses are different.
All answers
Introducing Science
1
According to her teacher’s advices, Karen then modifies her experimental set-up.
Independent variable
Dependent variable
Controlled variables
(the only variable that is changed)
(the variable to be measured)
(variables that are kept the same)
After one day, Karen measures the volumes of water remaining in the beakers. The table
below shows her results.
Brand of desiccant
Volume of water remaining (cm3)
Super Brand desiccant
40
Brand P desiccant
45
Brand Q desiccant
38
Brand R desiccant
43
According to the results, which brand of desiccant has the best water-absorbing
ability? (1 mark)
Total Score : / 50
Sectional Exercise
(4 marks)
Integrated Exercise
(c)
Write down the variables involved in Karen’s experiment.
Spelling Corner
(b)
29
All answers
1
Introducing Science
S PELLING C ORNER
Look at each group of figures below. Use one key term in science to describe the figures. The
letters forming the missing part of the key term can be found on the right.
1.
U
A
R
Sectional Exercise
T
S
A
Key term:
2.
Integrated Exercise
I
N
N
N
I
E
T
V
O
Key term: SCIENTIFIC
Spelling Corner
3.
I
U
E
P
Key term: SAFETY
30
P
A
P
M
N
Q
T
E