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# Marking scheme for Section C.doc

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### Marking scheme for Section C.doc

1. 1. Program Galus Sains SPM SMK Kuala Pegang 2009 Skema Jawapan Bahagian C – Soalan 10 _______________________________________________________________________ _ 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] 1
2. 2. Program Galus Sains SPM SMK Kuala Pegang 2009 Skema Jawapan Bahagian C – Soalan 10 _______________________________________________________________________ _ 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. 2
3. 3. Program Galus Sains SPM SMK Kuala Pegang 2009 Skema Jawapan Bahagian C – Soalan 10 _______________________________________________________________________ _ (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 3
4. 4. Program Galus Sains SPM SMK Kuala Pegang 2009 Skema Jawapan Bahagian C – Soalan 10 _______________________________________________________________________ _ (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 4
5. 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 _______________________________________________________________________ _ 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 5
6. 6. Program Galus Sains SPM SMK Kuala Pegang 2009 Skema Jawapan Bahagian C – Soalan 10 _______________________________________________________________________ _ (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 ] 6
7. 7. Program Galus Sains SPM SMK Kuala Pegang 2009 Skema Jawapan Bahagian C – Soalan 10 _______________________________________________________________________ _ 7