KERTAS 1

1. The salt that is commonly used to give salty taste during preparation of food in the kitchen isGaram yang biasa digunakan untuk memberikan rasa masin dalam makanan di dapur ialah

A Monosodium glutamate Monosodium glutamate

B Sodium chloride Natrium klorida

C Sodium hydrogen carbonate Natrium hidrogen karbonat

D Sodium benzoateNatrium benzoate

2. The final step in scientific method is Langkah terakhir dalam kaedah saintifik ialah

A Collecting dataMengumpul data

B Writing a reportMenulis laporan

C Doing observationMembuat pemerhatian

D Forming hypothesisMembuat hipotesis

3. After making observations, a chemist should try to Selepas membuat pemerhatian, ahli kimia perlu

A Collect dataMengumpul data

B Making inferenceMembina inferen

C Make hypothesisMembuat hipotesis

D Identify problemMengenalpasti masalah

KERTAS 2 ( Sec A)

3. Table 1 shows the proton numbers, nucleon and the number of neutrons of several elements.Jadual 1 menunjukkan nombor proton, nombor nukleon, dan bilangan neutron bagi beberapa unsur.

Element/Unsur

Proton number/Bilangan proton

Nucleon number/ nombor nukleon

Number of neurtron/Bilangan neutron

P 6 12 6Q 7 14R 6 7T 5 11 6

Table 1/ Jadual 1

(a) Complete the Table 1 aboveLengkapkan Jadual 1 diatas

[2 marks]

(b) Write the electron arrangement of atoms Q and STuliskan susunan electron bagi atom Q dan S

(i) R:_____________________

(ii) T: ____________________ [2 marks]

(c) Draw the atomic structure of atom Q and state the number of valence electron of Q

Lukiskan struktus atom Q dan nyatakan nombor valens elekron atom Q.

[2 marks]

(d) (i) Determine the isotopes pairs from the table 1 Tentukan pasangan isotope dalam Jadual 1

_________________________________________________________________

[1 marks]

(ii) Give a reason for your answer in d(ii)

_________________________________________________________________

[1 marks]

(e) Isotopes is very useful is our lives. For example, Cobalt-60 is used in radiotheraphy for the treatment of cancer.Isotop sangat berguna dalam kehidupan kita. Sebagai contoh, kobalt-60 digunakan untuk terapi penyakit kanser.

(i) The statement above is the importance of isotopes in medical field. Give another one importance of isotope in agriculture field with the isotope element. Kenyataan diatas adalah kepentingan isotop dalam bidang kesihatan. Berikan satu lagi contoh kepentingan isotop dalam bidang pertanian beserta unsur isotopnya.

_________________________________________________________________

_________________________________________________________________[2 marks]

ANSWER (Paper 1)

1. B2. B3. A

ANSWER (Paper 2 sec A)

NO. Rubric Marks 3. a Q: 7

R: 13

1

1 b (i)

(ii)

R: 2.4

T: 2.3

1

1 c

Valence electron : 5

1

1

d (i)

(ii)

P and R

Because they have same proton numbers but different neutron numbers

1

1

e Phosphorus -32

Used in fertilizers

TOTAL

1

1

10

Q