SECONDARY ONE SCIENCE (G3)
TERM 2 REVISION WORKSHEET 1
Multiple-Choice Questions
1.
An element is a substance that
A
B
C
D
2.
is made up of two or more substances that are chemically combined.
is made up of two or more substances that are not chemically combined.
can be broken down into two or more simpler substances by chemical methods.
cannot be broken down into two or more simpler substances by chemical methods.
(
)
(
)
(
)
Which of the following factors affects the solubility of a substance?
I type of solvent
II temperature
III size of particles
A
B
C
D
3.
Which of the following statements correctly describes the Periodic Table?
A
B
C
D
4.
There are more non-metallic elements than metallic elements.
Elements are arranged according to their chemical symbols.
The zigzag line divides the elements into metals and non-metals.
Metallic elements are found on the right-hand side.
What is the correct order of steps to separate salt from a mixture of salt and sand?
A
B
C
D
5.
I and II only
I and III only
II and II only
I, II and III
filtration → dissolving → evaporation to dryness
filtration → evaporation to dryness → dissolving
dissolving → filtration → evaporation to dryness
evaporation to dryness → dissolving → filtration
(
)
A list of substances is given below.
I
II
III
IV
table sugar
tea grains
sodium chloride crystals
baking powder
Which of the two substances form suspensions using water as a solvent?
A
B
C
D
I and II
I and III
II and III
II and IV
(
)
6
7
The list of materials below shows a class of __________________.
•
•
•
•
Lithium
Calcium
Magnesium
Aluminium
A
B
C
D
plastics
metals
fibres
compound
)
(
)
What are the 3Rs to save the environment?
A
B
C
D
8
(
reduce, reuse, recycle
retain, rewash, recycle
remove, recycle, reduce
rinse, rewash, reuse
What does each of the diagram below represent?
Figure 1
Figure 1
Figure 2
Figure 3
Figure 2
Figure 3
A
mixture of elements
element
compound
B
compound
mixture of elements
element
C
element
compound
mixture of compounds
D
element
mixture of compounds
mixture of elements
(
9
)
Which of the following are not examples of mixtures?
A
B
C
D
copper and water
carbon dioxide
sand and salt
air
(
2
)
10 The setup below shows the separation technique known as ____________ and it depends on the
_____________.
lid
paper
Solvent front
Solvent
A
B
C
D
filtration, solubility of the substances
distillation, boiling point of the substances
chromatography, difference in colour
chromatography, differences in solubility of the substances
(
)
The diagram below shows a setup for distillation. Refer to the diagram for Questions 11 and 12.
thermometer
Round-bottomed
flask
Condenser
sea water
granules
X
(boiling chips)
pure water
heat
11 What is the name given to the pure water collected?
A
B
C
D
solute
solvent
distillate
residue
(
3
)
12 What is the substance entering/leaving the device at point X?
A
B
C
D
cold water entering
cold water leaving
hot water entering
hot water leaving
(
)
Commented [KLW1]: I can’t remember but have we
taught our 1NA students on 4 national taps of water?
13 Which of the following is not a main source of water in Singapore?
A
B
C
D
ground water
NEWater
rain water
sea water
Commented [NHY2R1]:
Commented [NHY3R1]:
(
)
Structured Questions
1
(a)
Consider the following list of common substances.
air
brass
copper
crude oil
salt
sea water
sugar
water
Choose from this list one substance which is a
(i)
mixture containing both elements and compounds,
……………………………………………………………………………...
(ii)
mixture of compounds,
……………………………………………………………………………...
(iii)
[1]
compound containing only two elements,
……………………………………………………………………………...
(v)
[1]
mixture of elements,
……………………………………………………………………………...
(iv)
[1]
[1]
compound containing hydrogen.
……………………………………………………………………………...
4
[1]
(b)
In the diagrams, each circle represents an atom. Circles of different sizes and
shadings show different elements.
A
B
C
D
E
Using the letters A-E in Fig. 1, identify which of the following is/are:
2
(i)
molecule of pure compound, ……………………………………………
[1]
(ii)
molecule of elements, …………………………………………………...
[1]
(iii)
mixture of elements, …………………………………………………….
[1]
(iv)
mixture of compounds. ………………………………………………….
[1]
The table below shows the properties of four elements, A, B, C and D.
element
melting point / °C
conducts
hardness
electricity?
(a)
(i)
A
39.3
yes
soft
B
- 101.5
no
soft
C
113.7
no
soft
D
4623
no
very hard
Which element(s) in the table are metals?
……………………………………………………………………………………………………
(ii)
[1]
Explain your answer to (a)(i).
……………………………………………………………………………………………………
……………………………………………………………………………………………………
5
[1]
3
With the help of the words given below, name the method which is most suitable for separating the
following substances. Some of the words may be used more than once.
distillation
chromatography
magnetic separation
evaporation
(a)
filtration
tea leaves from a pot of tea
……………………………………………………………………………………………………………
(b)
red pigment from flower petals
……………………………………………………………………………………………………………
(c)
[1]
water from seawater
……………………………………………………………………………………………………………
4
[1]
salt from seawater
……………………………………………………………………………………………………………
(d)
[1]
[1]
Paper chromatography can be used to investigate the coloured dyes found in different brands of
ink p, q, r, s, t and u. The results of the experiment are shown below.
(a)
Which ink(s) contains a single coloured dye?
……………………………………………………………………………………………………………
(b)
Which inks would you mix to make ink p?
……………………………………………………………………………………………………………
(c)
[1]
Which ink is insoluble in the solvent?
……………………………………………………………………………………………………………
(d)
[1]
[1]
Which coloured dye is the most soluble? Explain your answer.
……………………………………………………………………………………………………………
……………………………………………………………………………………………………………
6
[2]
(e)
Suggest the solvent that is used in this experiment.
……………………………………………………………………………………………………………
(f)
[1]
Describe what will happen if the starting line is drawn below the solvent level.
……………………………………………………………………………………………………………
……………………………………………………………………………………………………………
(g)
[1]
Suggest a suitable substance to draw the starting line. Explain your answer.
……………………………………………………………………………………………………………
……………………………………………………………………………………………………………
(h) Explain how chromatography method is used to separate the coloured dyes in ink.
……………………………………………………………………………………………………………
……………………………………………………………………………………………………………
……………………………………………………………………………………………………………
……………………………………………………………………………………………………………
END OF WORKSHEET
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