Living Science (Second Edition) Unit Test 1
5
The wonderful solvent  water
S1 Science Test
Unit 5 The wonderful solvent - water
Name: ____________________________（
）
Time and Marks
Class: ____________________________
Part A: 35 min / 100 marks
Date: ____________________________
Parts A & B: 45 min / 120 marks
Note:
1
Attempt ALL questions.
2
Write your answers in the spaces provided on the Answer Sheets.
Part A (Level 1)
A
Matching
(4 marks, 1 mark each)
During the purification of water in water treatment plant, different chemicals are added for different purposes. Match
the chemicals on the left with the functions on the right by writing a to d in the blanks on the answer sheets.
1 Lime
a Kill micro-organisms.
2 Chlorine
b Prevent tooth decay.
3 Alum
c Adjust the acidity of water.
4 Fluoride
d Stick impurities in water together.
B
Multiple-choice questions
(20 marks, 2 marks each)
Choose the correct answer for each of the following questions.
1
2
How much of our body weight is made of water?
A
30%
B
50%
C
70%
D
90%
The figure on the right shows a waterfall. What types of impurities can
be found in water from the waterfall?
(1) Soluble impurities (2) Insoluble impurities (3) Micro-organisms
A
(1) and (2) only.
B
(1) and (3) only.
C
(2) and (3) only.
D
(1), (2) and (3).
© Oxford University Press 2005
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Living Science (Second Edition) Unit Test 1
3
5
The wonderful solvent  water
The figure on the right shows some bottled water. The water is purified
by
4
5
A
sedimentation.
B
distillation.
C
filtration.
D
chlorination.
Which of the following can be removed from water by sedimentation?
A
Sand
B
Dye
C
Bacteria
D
Salt
The figure on the right shows a filter column. It is used to remove solid
impurities from water. Which of the following are correct for P, Q, R and S?
6
P
Q
R
S
A
Rock chips
Coarse sand
Small stones
Fine sand
B
Coarse sand
Fine sand
Small stones
Rock chips
C
Fine sand
Coarse sand
Small stones
Rock chips
D
Small stones Rock chips
Coarse sand
Fine sand
Which of the following are the most common micro-organisms in water?
(1) HIV
7
8
(2) Amoeba
A
(1) and (2) only.
B
(1) and (3) only.
C
(2) and (3) only.
D
(1), (2) and (3).
(3) E. coli
Which of the following methods cannot kill micro-organisms in water?
A
Boil the water.
B
Add fluoride to the water.
C
Add ozone to the water.
D
Add chlorine to the water.
Which of the following is the largest reservoir in Hong Kong? Where is it?
Reservoir
Location
A
High Island Reservoir
Sai Kung
B
High Island Reservoir
Tsuen Wan
C
Plover Cover Reservoir
Tsuen Wan
D
Plover Cover Reservoir
Ma On Shan
© Oxford University Press 2005
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P
Q
R
S
Living Science (Second Edition) Unit Test 1
9
10
C
5
The wonderful solvent  water
Which government department is responsible for purification of water in Hong Kong?
A
Water Treatment Plant
B
Water Supplies Department
C
Food and Environmental Hygiene Department
D
Department of Health
Which of the following is not a water solute?
A
Salt
C
Coffee powder
B
Chicken powder
D
Sesame
Fill in the blanks
(20 marks, 2 marks each)
Complete the following sentences.
1
a
is used in drinking fountains in schools and household water filters to kill micro-organisms in water.
2
The water cycle consists of
3
In Hong Kong, water comes from two sources:
4
Water is a good
5
Sugar, salt, snow and quartz are some common examples of
6
If a solution is
j , no more solute can be dissolved when we continuously add the solute into the solution.
Questions
(56 marks)
D
1
b ,
c , transportation and
e
d .
collected in reservoirs and water imported from
g . It can dissolve a lot of substances and form
h .
i .
The figure below shows a set of apparatus for distillation.
Q
R
P
muddy pond water
X
© Oxford University Press 2005
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f .
Y
S
Living Science (Second Edition) Unit Test 1
2
5
The wonderful solvent  water
a
Name P, Q, R and S.
(4 marks)
b
What is the function of R?
(2 marks)
c
Water flows in and out from R through X and Y. Which one allows water to flow out?
Which one allows water to flow in? Why should such arrangement be made?
(4 marks)
d
What impurities can be removed by distillation but not by filtration?
(2 marks)
e
What should the reading of Q in the figure be?
(1 mark)
f
Briefly describe how distillation can purify water.
(3 marks)
Mrs Wong is drying some wet clothes.
The wet clothes can dry
up quickly.
a
Why do the wet clothes dry up?
b
In the figure, Mrs Wong said, ‘The wet clothes can dry up quickly.’ What does ‘quickly’ refer
(1 mark)
to in this sentence?
(1 mark)
c
Why does Mrs Wong think that the wet clothes can dry up ‘quickly’?
(2 marks)
d
Besides the reasons in c, give two other factors that can make the wet clothes dry up more quickly.
(4 marks)
e
How is the time for drying affected if Mrs Wong folds the clothes before hanging them up to
(3 marks)
dry? Why?
f
Some families use drying machines to dry up clothes. State a way of how the clothes dry up
(2 marks)
in drying machines.
© Oxford University Press 2005
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Living Science (Second Edition) Unit Test 1
3
5
The wonderful solvent  water
The following are the logos of two government departments which are responsible for controlling water
pollution in Hong Kong (A and B).
B
A
4
a
Name these two departments.
b
What actions do these departments take in controlling water pollution? List one example for
(4 marks)
each department.
c
List four pollutants commonly found in the waters in Hong Kong.
(4 marks)
d
List two pollution problems caused if we do not treat the sewage properly.
(4 marks)
(2 marks)
The figure below shows the process of dissolving copper sulphate in water.
copper sulphate
yellow flame
a
Write down two methods used in the figure to increase the rate of dissolving copper sulphate.
(4 marks)
b
Besides the methods in a, suggest another method that can also increase the rate of dissolving
copper sulphate.
(2 marks)
c
What is wrong in the above experiment?
(2 marks)
d
If no more copper sulphate can dissolve, what is the solution at this point called?
(1 mark)
A student filters the solution and separates it into two. Then he puts them in a classroom and a
refrigerator separately to cool down.
e
After cooling down, what are formed in the solutions? What are their shapes?
f
What is the difference between the materials formed in the classroom and in the refrigerator? (2 marks)
－ End of Part A －
© Oxford University Press 2005
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(2 marks)
Living Science (Second Edition) Unit Test 1
5
The wonderful solvent  water
Part B (Level 2) (20 marks)
Water Crisis
In Hong Kong, growing population and new industries are demanding for more water. Hong Kong may be running
out of water shortly. A meeting is held to discuss this problem. If you are one of the members, how will you answer
the following questions?
Stage 1: Understand the water supply in Hong Kong
1
What are the sources of water supply in Hong Kong?
(2 marks)
2
Give two activities that consume large amounts of water at home.
(2 marks)
3
The 3Rs principle is a rule of conserving water. What does ‘3Rs’ mean?
(3 marks)
Stage 2: Give possible suggestions
During the meeting, there are several suggestions.
Raise the price of water. This
Mr Lee
not only can encourage people
to use less water, but also can
increase our income.
Miss Wong
Build a new treatment
plant to purify water. It
can recycle the sewage
Buy more water from
and increase the water
the Mainland China.
supply.
Mr Ho
4
Give a disadvantage for each suggestion.
(3 marks)
5
If you have to choose one of the above suggestions, which one will you choose? Why?
(3 marks)
6
Suggest three more solutions to solve the problem.
(3 marks)
Stage 3: Conclusion and Execution
After discussion, Mr Lee’s suggestion is accepted. Besides, people should learn the importance of conserving
water.
7
Design a leaflet about how to educate people on conserving water at home.
－ End of Part B －
© Oxford University Press 2005
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(4 marks)
Living Science (Second Edition) Unit Test 1
5
The wonderful solvent  water
S1 Science Test
Unit 5 The wonderful solvent - water
Answer Sheets
Name: __________________（
）
Class: ____________
Marks: __________________
Total: 100% (Part A) / 120% (Parts A & B)
Section A Total
Do not write in
this box
Part A (Level 1)
A
Matching (4 marks, 1 mark each)
1 __________ 2 __________ 3 __________ 4 __________
B
Multiple-choice questions (20 marks, 2 marks each)
Section B Total
Do not write in
this box
1 __________ 2 __________ 3 __________ 4 __________ 5 __________
6 __________ 7 __________ 8 __________ 9 __________ 10 __________
C
Fill in the blanks (20 marks, 2 marks each)
a ______________________
b ______________________
c ______________________
d ______________________
e ______________________
f ______________________
g ______________________
h ______________________
i ______________________
j ______________________
D
Questions (56 marks)
1 a ___________________________________________________________________________
___________________________________________________________________________
b ___________________________________________________________________________
c ___________________________________________________________________________
___________________________________________________________________________
d ___________________________________________________________________________
e ___________________________________________________________________________
f
___________________________________________________________________________
___________________________________________________________________________
© Oxford University Press 2005
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Section C Total
Do not write in
this box
Living Science (Second Edition) Unit Test 1
5
The wonderful solvent  water
2 a ___________________________________________________________________________
b ___________________________________________________________________________
c ___________________________________________________________________________
___________________________________________________________________________
d ___________________________________________________________________________
___________________________________________________________________________
e ___________________________________________________________________________
___________________________________________________________________________
f
___________________________________________________________________________
___________________________________________________________________________
3 a ___________________________________________________________________________
b ___________________________________________________________________________
___________________________________________________________________________
c ___________________________________________________________________________
___________________________________________________________________________
d ___________________________________________________________________________
___________________________________________________________________________
4 a ___________________________________________________________________________
___________________________________________________________________________
b ___________________________________________________________________________
c ___________________________________________________________________________
d ___________________________________________________________________________
___________________________________________________________________________
e ___________________________________________________________________________
f
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
© Oxford University Press 2005
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Section D Total
Do not write in
this box
Living Science (Second Edition) Unit Test 1
5
The wonderful solvent  water
Part B (Level 2) (20 marks)
1 _______________________________________________________________________________
2 _______________________________________________________________________________
_______________________________________________________________________________
3 _______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
4 _______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
5 _______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
6 _______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
7 Leaflet design:
Part B Total
Do not write in
this box
© Oxford University Press 2005
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Living Science (Second Edition) Unit Test 1
5
The wonderful solvent  water
S1 Science Test (Unit 5 The wonderful solvent  water)
Answers
Part A (Level 1)
A
Matching (4%)
1c
2a
B
3d
4b
1 m each
Multiple-choice questions (20%)
1C
C
2D
3B
4A
5C
6C
7B
8A
9B
10 D
2 m each
Fill in the blanks (20%)
a Ultra-violet light b evaporation c condensation d raining
e rainwater
f Dong Jiang
j saturated
D
g solvent
h solutions
i crystals
2 m each
Questions (56%)
1 a P: distillation flask; Q: thermometer; R: condenser; S: distillate
b It changes / condenses steam to water.
1 m each
2m
c X: water out; Y: water in
1 m each
This ensures there is water in the condenser even when the water tap is closed.
d Micro-organisms and soluble impurities.
2m
1 m each
e 100oC
1m
f
Boil the muddy pond water using Bunsen burner. Water becomes steam.
1m
Steam condenses to water when it cools down in the condenser. Water is collected in the beaker.
1m
The distillate is purified water.
1m
2 a Water in the clothes is evaporated.
1m
b The rate of evaporation of water in the wet clothes.
1m
c It is because there are wind and no raining.
1 m each
d Increase in the air temperature and decrease in the relative humidity.
2 m each
e It takes longer time to dry up as the surface area of the clothes in contact with air is decreased.
3m
f
2m
Increase the temperature. / Use centrifugal force.
3 a A: Environmental Protection Department; B: Drainage Services Department
1 m each
b EPD: Set the law to control water pollution. DSD: Run sewage treatment plants.
2 m each
c Sewage, oil, industrial wastes and plastics.
1 m each
d Red tides / death of fish / skin rashes / eye infection (any 2)
2 m each
4 a Stir the solution with a glass rod and heat the solution.
2 m each
b Use fine copper sulphate powders.
2m
c Use blue flame instead of yellow flame when heating.
2m
d Saturated solution
1m
e Crystals are formed. They are regular in shape.
2m
f
2m
Crystals formed in the classroom are bigger than those formed in the refrigerator.
© Oxford University Press 2005
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Living Science (Second Edition) Unit Test 1
5
The wonderful solvent  water
Part B (Level 2) (20%)
1 Rainwater collected in reservoirs and water imported from Dong Jiang.
1 m each
2 Wash clothes / wash dishes / take a bath (or other reasonable answers) (any 2)
1 m each
3 Reduce, reuse and recycle.
1 m each
4 Mr Ho: The cost of building a sewage treatment plant is too high.
1m
Mr Lee: Increase the burden of citizens. / Employers might lay off some staff to minimize the cost.
1m
Miss Wong: Increase the expense of the government. / Build a bigger system to transport water.
1m
(Or other reasonable answers.)
5 Any reasonable answers.
3m
6 Limit the water supply to the public. / Find new resources of water supply, e.g. building a reservoir. /
Encourage water conservation. (Or other reasonable answers.)
7 Leaflet design
3m
1m
Content: Take showers instead of taking bath in a bath-tub. / Repair any dripping taps. / Wash more
clothes and dishes at one time. / Wash vegetables and clothes in basins, not under running water.
(Or other correct methods.)
© Oxford University Press 2005
3m
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