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MODULE • Chemistry Form 4

(d) Element R react with oxygen and to produce liquid Z at room temperature. The graph below shows the sketch of the
graph when liquid Z at room temperature, 27°C is cooled to –5°C.
Unsur R bertindak balas dengan oksigen dan menghasilkan cecair Z pada suhu bilik. Rajah di bawah menunjukkan lakaran graf
apabila cecair Z pada suhu bilik, 27°C disejukkan sehingga –5°C.
Temperature /°C
Suhu /°C

0 Time /s
t Masa /s
t 1
2
−5
(i) What is the state of matter of liquid Z from t to t ? Explain why is the temperature remain unchanged from
2
1
t to t .
1 2
Apakah keadaan jirim Z daripada t hingga t ? Terangkan mengapa suhu tidak berubah daripada t hingga t .
1 2 1 2
Liquid and solid. Heat lost to the surrounding is balanced by the heat released when the particles at 0 °C
(ii) Draw the arrangement of particles of Z at 20°C.
Lukiskan susunan zarah-zarah Z pada suhu 20°C.

(iii) Describe the change in the particles movement when Z is cooled from room temperature to –5°C.
Nyatakan perubahan dalam pergerakan zarah-zarah apabila cecair Z disejukkan daripada suhu bilik ke –5°C.
The particles move slower

Objective Questions / Soalan Objektif

1 The diagram shows the arrangement of particles for a type 3 The diagram below shows the heating curve for substance X.
of matter that undergoes a change in physical state through Rajah di bawah menunjukkan lengkung pemanasan bahan X.
process X. Temperature / Suhu °C
Rajah di bawah menunjukkan susunan zarah sejenis bahan yang
mengalami perubahan keadaan fizik melalui proses X. U
S
Q T
X R
P Time (m)
Masa (m)

What is process X? Which region of the graph does boiling process occur?
Apakah proses X? Bahagian manakah pada graf berlaku proses pendidihan?

A Melting C Freezing A PQ C ST
Peleburan Pembekuan B QR D TU
B Boiling D Sublimation
Pendidihan Pemejalwapan 4 Which of the following information is true?
Antara pernyataan berikut, yang manakah adalah betul?
2 Which of the following substances can undergo sublimation Change of state Process Heat energy
when heated? Perubahan keadaan Proses Tenaga haba
Antara bahan berikut, yang manakah mengalami pemejalwapan apabila
dipanaskan? A Solid → Liquid Melting Released
A Sulphur C Glucose Pepejal → Cecair Peleburan Dibebaskan
Sulfur Glukosa B Liquid → Gas Evaporation Released
B Ammonium chloride D Sodium chloride Cecair → Gas Penyejatan Dibebaskan
Ammonium klorida Natrium klorida
C Gas → Solid Sublimation Released
Gas → Pepejal Pemejalwapan Dibebaskan
D Gas → Liquid Condensation Absorbed
Gas → Cecair Kondensasi Diserap
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