PAPER 3 (ANSWER) - CHEMISTRY TRIAL SPM (2018)

SKEMA JAWAPAN PEP. PERCUBAAN KIMIA KERTAS 2 (2018)

Question number 1 (a)

Rubric Able to state an observation accurately

4541/3

Score 3

Sample answer: Rubber strip Y is extended longer than rubber strip X Pemanjangan jalur getah Y adalah lebih panjang daripada jalur getah X Able to state the observation correctly 2 Sample answer: Rubber strip Y is extended/become longer Jalur getah Y memanjang / lebih panjang // Rubber strip X did not extend Jalur getah X tidak memanjang Able to state idea of the observation

1

Sample answer: Rubber strip extended Jalur getah memanjang No response or wrong response

0

1

SKEMA JAWAPAN PEP. PERCUBAAN KIMIA KERTAS 2 (2018) Question number 1 (b)

Rubric Able to state an accurate inference for this experiment

4541/3

Score 3

Sample answer: Rubber strip X is more elastic than rubber strip Y Jalur getah X lebih kenyal daripada jalur getah Y Able to state the inference for this experiment

2

Sample answer: Rubber strip X is hard Jalur getah X keras // Rubber strip Y is soft Jalur getah Y lembut

Question number 1 (c)

Able to state the general inference for this experiment

1

Sample answer: X is more elastic rubber Jalur getah X lebih kenyal No response or wrong response

0 Rubric

Able to state all three variables correctly

Score 3

Sample answer: (i) Manipulated variable Rubber strip X, Rubber strip Y Jalur getah X, jalur getah Y // Type of rubber (strip) Jenis (jalur) getah (ii) Responding variable The length of rubber strip after weight is removed Panjang jalur getah selepas pemberat dialihkan (iii) Fixed variable Size of rubber strip Saiz (jalur) getah // Mass of weight Jisim pemberat // Initial length of rubber strip Panjang asal jalur getah

2

SKEMA JAWAPAN PEP. PERCUBAAN KIMIA KERTAS 2 (2018) Able to state any 2 of the above information correctly Able to state any 1 of the above information correctly No response or wrong response Question number 1 (d)

Rubric Able to state the relationship between the manipulated variable and the responding variable correctly and with direction

4541/3 2 1 0 Score 3

Sample answer: Rubber strip X is more elastic than rubber strip Y Jalur getah X lebih kenyal daripada jalur getah Y Able to state the relationship between the manipulated variable and the responding variable less accurately [RV first, MV later]

2

Sample answer: The elasticity of rubber strip X is high than rubber strip Y Kekenyalan jalur getah X tinggi berbanding jalur getah Y Able to state an idea of the hypothesis

1

Sample answer: Rubber strip X is less elastic Jalur getah X kurang kenyal No response or wrong response Question number 1 (e)

0

Rubric

Score

Able to give an accurate relationship between length of rubber strip and elasticity

3

Sample answer: When the length of rubber strip increases the elasticity decreases Apabila panjang jalur getah bertambah kekenyalan berkurang Able to give less accurately the relationship between length of rubber strip and elasticity

2

Sample answer: When the length increases the elasticity decreases Apabila panjang bertambah kekenyalan berkurang

3

SKEMA JAWAPAN PEP. PERCUBAAN KIMIA KERTAS 2 (2018) Able to give and idea of relationship between length of rubber strip and elasticity

4541/3 1

Sample answer: Directly proportional Berkadar terus No response or wrong response Question number 1 (f)

Rubric Able to state the operational definition correctly

0 Score 3

Sample answer: The longer the length of rubber strip after weight is removed the less elastic the rubber strip.

Semakin panjang jalur getah selepas pemberat dialihkan, semakin kurang kenyal jalur getah itu Able to state the operational definition less correctly

2

Sample answer: After weight is removed the rubber strip become longer Apabila pemberat dialihkan jalur getah menjadi lebih Panjang Able give an idea for operational definition

1

Sample answer: The length of rubber strip increase Panjang jalur getah bertambah No response or wrong response

0

4

SKEMA JAWAPAN PEP. PERCUBAAN KIMIA KERTAS 2 (2018) Question number 1 (g)

Rubric Able to explain the observation by stating all the following aspect correctly

4541/3

Score 3

Sample answer: 1. Rubber strip Y has more double bond between carbon and carbon atom Jalur getah Y mempunyai lebih banyak ikatan ganda dua antara atom karbon 2. Rubber strip X has less double bond between carbon and carbon atom Jalur getah X mempunyai kurang ikatan ganda dua antara atom karbon 3. Rubber strip Y easily undergoes oxidation process compared to rubber strip X Jalur getah Y lebih mudah mengalami pengoksidaan berbanding jalur getah X Able to explain the observation by stating any two of the aspect correctly Able to explain the observation by stating any one of the aspect correctly No response or wrong response Question number 1 (h)

Rubric Able to predict the rubber that will snap first and state the type of rubber strip X and Y correctly

2 1 0 Score 3

Answer: 1. Rubber Y will snap first Getah Y akan terputus dahulu 2. Rubber strip X : Vulcanized rubber Jalur getah X : Getah tervulkan 3. Rubber strip Y : Unvulcanized rubber Jalur getah Y : Getah tak tervulkan Able state any two of the answer correctly Able state any one of the answer correctly No response or wrong response

2 1 0

5

SKEMA JAWAPAN PEP. PERCUBAAN KIMIA KERTAS 2 (2018)

Question number 2 (a)

4541/3

Rubric

Score

Able to give the correct answer and correct unit Reading (a) : 18.75 g Reading (b) : 20.75 g Reading (c) : 20.35 g

3

Able to give the correct answer without unit / with incorrect unit Able give an idea No response or wrong response Question number 2 (b)

Rubric

Score

Able to construct a table with correct readings Description Penerangan

3 Mass (g) Jisim (g)

Mass of combustion tube + porcelain dish Jisim tiub pembakaran + piring porselin

18.75

Mass of combustion tube + porcelain dish + copper oxide Jisim tiub pembakaran + piring porselin + kuprum oksida

20.75

Mass of combustion tube + porcelain dish + copper Jisim tiub pembakaran + piring porselin + kuprum

20.35

Able state any two of the answer correctly Able state any one of the answer correctly No response or wrong response Question number 2 (c)

2 1 0

Rubric

2 1 0 Score

Able to classify all chemical formula correctly

3

Empirical formula Molecular formula Formula empirik Formula molekul CH C6H12O6 CH2 C3H6 CH2O C2H4O2 Able state any two of the answer correctly Able state any one of the answer correctly No response or wrong response

2 1 0

6

SKEMA JAWAPAN PEP. PERCUBAAN KIMIA KERTAS 2 (2018) Question number 3 (a)

Rubric Able to give problem statement accurately

4541/3

Score 3

Sample answer: How to compare the heat of combustion of different alcohols?

Bagaimanakah membandingkan haba pembakaran alkohol? // How to compare the heat of combustion of methanol, ethanol and propan-1ol?

Bagaimanakah membandingkan haba pembakaran metanol, etanol dan propan-1-ol? // How does the number of carbon atoms per molecule affect the heat of combustion?

Bagaimanakah bilangan atom karbon per molekul mempengaruhi haba pembakaran?

Able to give the problem statement of the experiment less accurately / Able to give the aim of the experiment Sample answer: What is the heat of combustion of different alcohols?

Apakah haba pembakaran alkohol berbeza? // Comparing the heat of combustion of methanol, ethanol dan propan-1-ol Membandingkan haba pembakaran bagi metanol, etanol dan propan-1-ol Able to give an idea of the problem statement of the experiment No response given or wrong response

2

1 0

7

SKEMA JAWAPAN PEP. PERCUBAAN KIMIA KERTAS 2 (2018) Question number 3 (b)

Rubric Able to state the three variables correctly

4541/3

Score 3

Sample answer: (i) Manipulated variable Type of alcohols Jenis alkohol // Methanol, ethanol, propan-1-ol Metanol, etanol dan propan-1-ol (ii) Responding variable Heat of combustion Haba pembakaran (iii) Fixed variable Volume of water Isi padu air // Copper can Tin / bekas kuprum Able to state any 2 of the above information correctly Able to state any 1 of the above information correctly No response or wrong response

2 1 0

8

SKEMA JAWAPAN PEP. PERCUBAAN KIMIA KERTAS 2 (2018) Question number 3 (c)

4541/3

Rubric

Score

Able to state the relationship between the manipulated variable and the responding variable accurately

3

Sample answer: The higher the number of carbon atoms in the alcohol molecules, the higher the heat of combustion Semakin banyak bilangan atom karbon per molekul, semakin tinggi haba pembakaran Able to state the relationship between the manipulated variable and the responding variable

2

Sample answer: The higher the number of carbon atoms , the higher the heat of combustion Semakin banyak bilangan atom karbon, semakin tinggi haba pembakaran Able to state the idea of hypothesis correctly

1

Sample answer: Different type of alcohol ,different heat of combustion Jenis alkohol yang berlainan menghasilkan haba pembakaran yang berlainan No response or wrong response

0

9

SKEMA JAWAPAN PEP. PERCUBAAN KIMIA KERTAS 2 (2018) Question number 3 (d)

Rubric Able to give complete list of substance and apparatus

4541/3

Score 3

Answer: 1. Methanol / methanol 2. Ethanol / etanol 3. Propan-1-ol / propan-1-ol 4. Water / air 5. Copper can / tin kuprum 6. Thermometer / termometer 7. Spirit lamp / pelita 8. Electronic balance / penimbang elektronik 9. Wooden block / blok kayu 10. Pipe-clay triangle / segi tiga tanah liat 11. Tripod stand / tungku kaki tiga Able to list down the materials and apparatus correctly but not complete

2

Sample answer: 1. Methanol / methanol 2. Ethanol / etanol 3. Propan-1-ol / propan-1-ol 4. Water / air 5. Copper can / tin kuprum 6. Thermometer / termometer 7. Spirit lamp / pelita Able to give an idea on the list of apparatus and substances correctly

1

Sample answer: Any one material and one apparatus with thermometer Sebarang satu bahan dan satu radas dengan thermometer No response or wrong response Reject : no thermometer

0

10

SKEMA JAWAPAN PEP. PERCUBAAN KIMIA KERTAS 2 (2018) Question number 3 (e)

Rubric Able to state all the steps of the experiment accurately 1.

2.

3.

4.

5.

6.

7.

8.

9.

4541/3

Score 3

[100 – 250] cm3 of water is measured and poured into a copper can.

[100 – 250] cm3 air disukat dan dituang ke dalam tin kuprum.

The initial temperature of water is recorded.

Suhu awal air direkodkan.

The copper can is placed onto a tripod stand.

Tin kuprum diletakkan ke atas tungku kaki tiga A spirit lamp is filled with methanol / fuel X and the initial mass is weighed and recorded.

Pelita diisi dengan methanol / bahan api X dan jisim awal ditimbang dan direkodkan The spirit lamp is put under the copper can and the wick of the lamp is lighted immediately.

Pelita diletakkan di bawah tin kuprum dan sumbu pelita dinyalakan serta merta.

The water is stirred with the thermometer until the temperature rises about 30°C. Air dikacau dengan termometer sehingga suhu meningkat sebanyak 30°C The flame is put off and the highest temperature is recorded.

Nyalaan dipadamkan dan suhu tertinggi dicatatkan. r : final temperature / suhu akhir The spirit lamp and its content is weighed immediately and the final mass is recorded.

Pelita dan kandungannya ditimbang serta-merta dan jisimnya dicatatkan Steps 1-8 are repeated using ethanol and propan-1-ol / fuel Y to replace methanol / fuel X. Langkah 1 – 8 diulang menggunakan etanol dan propan-1-ol / bahan api Y bagi menggantikan metanol / bahan api X.

Able to state 5 steps of the experiments : Steps 2, 4, 5, 6, 7 Able to state 2 minimum steps correctly : Steps 5, 6 No response or wrong response

2 1 0

11

SKEMA JAWAPAN PEP. PERCUBAAN KIMIA KERTAS 2 (2018) Question number 3 (f)

4541/3

Rubric

Score

Able to exhibit the tabulation of data that include the following four Information 1. Correct heading for manipulated variable 2. Correct heading for responding variable 3. Substance used as manipulated variable listed.

4. Table has four rows and two columns Type of alcohol Jenis alkohol

Initial temperature of water / 째C Suhu awal air / 째C

Highest temperature of water / 째C Suhu tertinggi air / 째C

Initial mass of spirit lamp / g Jism awal pelita / g

2

Final mass of spirit lamp / g Jisim akhir pelita / g

Methanol Metanol Ethanol Etanol Propan-1-ol Propan-1-ol Able to exhibit the tabulation of data less accurately 1. One correct heading or at least substances listed 2. Table has at least two rows and two column

1

Empty table or no response given or wrong response

0

12