1. Program Galus Sains SPM SMK Kuala Pegang 2009
Skema Jawapan Bahagian C – Soalan 10
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Marking scheme for Section C
Skema pemarkahan untuk Bahagian C
Question 1
Soalan 1
(a) Hypothesis (Carbon dioxide/ gas release a by) yeast can increase the
height of a bread dough
[ 1 mark ]
(b) (i)Aim To show that the effect of ( carbon dioxide releases from) yeast
on the height of a bread dough.
[ 1 mark ]
(b)(ii)Variables
(a) Constant Mass of wheat flour
}
[ 1 mark ]
Max 2
(b) Manipulated The Presence of yeast
marks
[ 1 mark ]
(c) Responding Height of dough [ 1 mark ]
[ 1 mark ]
(b)(iii) Distilled water, beaker, wheat flour, yeast
Apparatus and [ 1 mark ]
material
(b)(iv)
Procedure
1. Mix the wheat flour , yeast and sugar in a beaker }pt
2. Add water a little at a time to the mixture and stir the mixture Pt 1
[ 1 mark ]
to form a paste.
3. (After that, take out of the beaker onto the work surface.
4. Knead the mixture of the paste and yeast.)
5. Fill the beaker with (the kneaded) dough.
6. Step 1 to 5 are repeated but no yeast is added - pt 2 Pt 3
7. Both beakers are left in a warm humid place for 20 minutes
8. The height of the dough is measured Pt 4
(b)(iv)
Tabulation of data Height of dough (cm)
Presence of yeast
Intial experiment Final experiment
Present
Absent
[1 mark]
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2. Program Galus Sains SPM SMK Kuala Pegang 2009
Skema Jawapan Bahagian C – Soalan 10
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Question 2
(a) Hypothesis 1. Microorganisms grow rapidly in moist condition.
Mikroorganisma tumbuh dengan pesat di kawasan lembap.
2. Humidity is needed for the growth of microorganisms
Kelembapan diperlukan untuk pertumbuhan mikroorganisma
[ 1 mark ]
(b)(i)Aim To study the effect of humidity on the growth of microorganisms
Untuk mengkaji kesan kelembapan ke atas pertumbuhan
mikroorganisma
[ 1 mark ]
(b)(i) Variables
(a) Constant 1. Type/ size of bread
}
Jenis/saiz roti
2. Suhu
Temperature [ 1 mark ]
(b) Manipulated Presence of water Max
Kehadiran air [ 1 mark ] 2m
(c) Responding The growth of microorganisms/fungi/mucor
Pertumbuhan mikroorganisma/fungi/mukor [ 1 mark ]
(b)(iii) (2 pieces of) bread, water, clear plastic bag
Apparatus and (2 keping) roti, air, beg plastik lutsinar [ 1 mark ]
material
(b)(iv) 1. Prepare 2 piece of bread with the same size and label A and
Procedure B. pt 1
bag.
3. Bread B is kept dry and placed in the clear plastic bag
}pt
2. Bread A is sprinkled with water and placed in a clear plastic Pt 2
[ 1 mark ]
4. Both plastic bags are kept in a dark cupboard for two days. Pt 3
5. The growth of microorganisms/fungi/mucor is observed and
recorded in the table. Pt 4
1. Sediakan dua keping roti yang sama saiz dan dilabel A dan B
2. Roti A direnjis dengan air dan diletakkan di dalam plastic
lutsinar .
3. Roti Bi dibiarkan kering dan dimasukkan ke dalam plastik
lutsinar
4. Kedua-dua beg plastik diletakkan di dalam almari selama 2
hari.
5. Pertumbuhan mikroorganisma/kulat/mukor diperhatikan dan
direkodkan ke dalam jadual.
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3. Program Galus Sains SPM SMK Kuala Pegang 2009
Skema Jawapan Bahagian C – Soalan 10
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(b)(v)
Tabulation of data Growth of microorganisms
Bread Presence of water / fungi/ mucor
Roti Kehadiran air Pertumbuhan mikroorganisma/
kulat/mukor
A Present
Hadir
B Absent
Tidak hadir
[1 mark ]
(b)(vi) Water is needed for the growth of microroganisms/ fungi/mucor
Conclusion Air diperlukan untuk pertumbuhan mikroorganisma/ fungi/mukor
[1 mark]
Question 3
(a) Hypothesis The bigger the mass of an object, the bigger its inertia.
[ 1 mark ]
(b)(i)Aim To study the relationship between mass and inertia.
[ 1 mark ]
(b)(i) Variables
(a) Constant Size / volume of tin
Length of rope
Height of tin hang [ 1 mark ]
(b) Manipulated Mass of tin
[ 1 mark ]
(c) Responding The difficulty to push and stop the tin
[ 1 mark ]
(b)(iii) Tin, tope, sand, wood
Apparatus and [ 1 mark ]
material
(b)(iv) 1. Two tins are prepared and label A and B. pt 1
Procedure 2. Tin A is filled with sand and tin B is left empty. Pt 2
3. Both tins are hung using ropes of the same length to a wood.
Given pt 1
4. Each tin is pushed from the same height and after a while, both
tins are stopped from swinging.
5. The tin which is difficult to swing and stop are observed pt 3
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4. Program Galus Sains SPM SMK Kuala Pegang 2009
Skema Jawapan Bahagian C – Soalan 10
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(b)(v)
Tabulation of data Tin Mass of tin The difficulty to swing or stop the tin
A Big
B Small
[ 1 mark ]
(b)(vi) The bigger the mass of the tin, the bigger its inertia.
Conclusion [ 1 mark ]
Question 4:
(a) Hypothesis 1. Weight of object decreases when it is immersed in a
liquid/water.
2. When an objeck is immersed in water, its weight decreases
[ 1 mark ]
(b)(i)Aim To study the changes of object’s weight when it is immersed
in water.
[ 1 mark ]
(b)(i) Variables
(a) Constant Size of wooden block
Type of liquid [ 1 mark ]
(b) Manipulated Length/ depth of wooden block immerse in water
[ 1 mark ]
(c) Responding Weight of wooden block
[ 1 mark ]
(b)(iii) Newton spring, wooden block, water, beaker, string,retort stand
Apparatus and
material [ 1 mark ]
(b)(iv)
Procedure
Retort stand
Kaki retort
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5. }
}
String
Newton spring Pt 1
Neraca spring
Wooden block
Program Galus Sains SPM SMK Kuala Pegang 2009 Pt 3
Skema Jawapan Bahagian C – Soalan 10 Water
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_ beaker
1. Wooden block is tied to a string }
2. Hang the Newton spring to a retort stand pt 1 // diagram
3. Using the newton spring, measure the weight of wooden block
in air pt 2
4. Immerse the wooden block partially in the water and measure
its weight. Pt 3// diagram
5. Step 4 is repeated by immersing fully the wooden block in the
water . pt 4
(b)(v)
Tabulation of data Length of wooden block immerse in Weight of wooden
water block
Partial
Full
[ 1 mark ]
Question 5
(a) Hypothesis Different metal shows different reactivity with dilute acid
[ 1 mark ]
(b)(i)Aim To study the reactivity of metals with (hydrochloric) acid
[ 1 mark ]
(b)(i) Variables
(a) Constant Type of acid
Concentration of acid
Mass of metal [ 1 mark ]
(b) Manipulated Type of metal
[ 1 mark ]
(c) Responding Reactivity of metal
[ 1 mark ]
(b)(iii) magnesium powder, aluminium powder, zinc powder, dilute
Apparatus and hydrochloric acid, test tube
material [ 1 mark ]
(b)(iv)
Procedure
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6. Program Galus Sains SPM SMK Kuala Pegang 2009
Skema Jawapan Bahagian C – Soalan 10
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(b)(v)
Tabulation of data
dilute dilute dilute
hydrochloric hydrochloric hydrochloric
acid acid acic
magnesium aluminium zinc
powder powder powd
A B C
1. Prepare three test tubes A, B and C
2. Pour dilute hydrochloric acid in test tube A, B and C – pt 1
3. Put:
(a) Magnesium powder in test tube A
(b) Aluminium powder in test tube
(c) Zinc powder in test tube C
}
pt 2
4. Observe the reactivity of the metals with dilute hydrochloric
acid and record in table. Pt 3
(b)(vi)
Type of metal Reactivity of metal
Magnesium
Aluminium
Zinc
[ 1 mark ]
(b)(vii) Different metal shows different reactivity with dilute acid
Conclusion [ 1 mark ]
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7. Program Galus Sains SPM SMK Kuala Pegang 2009
Skema Jawapan Bahagian C – Soalan 10
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