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MODULE • Chemistry Form 4

(c) (i) Compare the boiling point of elements W and X. Explain the difference.
Bandingkan takat didih unsur W dan X. Terangkan perbezaan itu.
The boiling point of element X is higher than element W.

The size of molecule X is bigger than molecule W .
2 2
The forces of attraction between molecules X is stronger than molecule W .
2 2
More heat energy is needed to overcome the stronger forces between molecules.
(d) (i) Element X can react with sodium element to form a compound. Write the chemical equation for the reaction.
Unsur X boleh bertindak balas dengan unsur natrium untuk membentuk sebatian. Tulis persamaan kimia untuk tindak balas
tersebut.
X + 2Na 2NaX
2
(ii) How does the reactivity of element W and element X differ? Explain your answer.
Bagaimanakah kereaktifan unsur W dan X berbeza? Terangkan jawapan anda.
Element W is more reactive than element X.
The size of atom W is smaller than atom X.

The outermost occupied shell of atom W is nearer to the nucleus compare to atom X.
The strength of the nucleus of atom W to attract electron to the outermost shell is stronger than atom X.

3 The table below shows the number of neutron and relative atomic mass of eight elements represented as P, Q, R, S, T, U
and W.
Jadual di bawah menunjukkan bilangan neutron dan jisim atom relatif bagi lapan unsur yang diwakili oleh huruf P, Q, R, S, T, U, V dan W.

Atom / Unsur P Q R S T U V W
Number of neutron 12 12 14 14 16 16 18 22
Bilangan neutron dalam atom
Relative atomic mass 23 24 27 28 31 32 35 40
Jisim atom relatif
Number of proton 11 12 13 14 15 16 17 18
Bilangan proton dalam atom
Electron arrangement 2.8.1 2.8.2 2.8.3 2.8.4 2.8.5 2.8.6 2.8.7 2.8.8
Susunan elektron dalam atom
(a) Complete the above table by writing the number of proton and electron arrangement for the atom of each element.
Lengkapkan jadual di atas dengan menulis bilangan proton dan susunan elektron bagi atom setiap unsur.
(b) (i) State the period of element P – W in the Periodic Table. Explain your answer.
Nyatakan kala manakah unsur P – W terletak dalam Jadual Berkala? Terangkan jawapan anda.
Period 3 because P – W atoms have three shells occupied with electrons.
(ii) What is the proton number of another element that is in the same group as P?
Nyatakan bilangan proton bagi unsur lain yang sama kumpulan dengan P.
3/19

(c) Write the standard representation for element Q / Tuliskan simbol perwakilan piawai untuk unsur Q.
24 Q
12
(d) Which element exist as / Unsur yang manakah wujud sebagai
monoatomic gas / gas monoatom? W diatomic gas / gas dwiatom? T/ U/ V
(e) (i) Which element can react vigorously with water to produce hydrogen gas?
Unsur yang manakah bertindak balas cergas dengan air untuk menghasilkan gas hidrogen?
P
(ii) Write the balanced equation for the reaction in (e)(i) / Tuliskan persamaan seimbang untuk tindak balas (e)(i).
2P + 2H O 2POH + H
2 2

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