Page 22 - Spotlight A+ Form 4 & 5 Chemistry KSSM

Form
4
Chemistry Chapter 5 Chemical Bond
(d) Based on the information in Table 2.1, classify substances X, Y and Z according to their solubility in
water. C3
Solubility in water Soluble Insoluble
Substance
(i) (ii)

(iii)
Table 2.2
[3 marks]
3. Figure 3 shows the electron arrangements of five elements P, Q, R, S and T.

P Q R S T
Figure 3
(a) Which element can form metallic bond? C2 [1 mark]
(b) P reacts with Q.
(i) What type of chemical bond is formed in the reaction? C1 [1 mark]
(ii) Draw the electron arrangement of the compound formed. C3 [1 mark]
(iii) Predict whether the compound formed can conduct electricity or not. Explain
your answer. C3 [1 mark]

(c) Element R is burnt vigorously in gas S.
(i)
[1 mark]
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What is the type of particle of compound formed in the reaction? C2
CHAP. (ii) Write the formula of the compound formed. C4 [1 mark] CHAP.
5 (d) State two differences of physical properties between compounds formed in (b) and (c). C4 5
[1 mark]
(e) Explain why element T exists as monoatomic gas at room temperature. C3 [1 mark]

Section B

SPM Clone
4. Figure 4 shows the chemical symbols which represent three elements, P, Q and R.

39 P 35 12 R
19 17Q 6
Figure 4
(a) (i) Write the electron arrangement of atoms P and R. C4 [2 marks]
(ii) State the number of neutrons in an atom of element Q. C2 [1 mark]
(iii) Write the symbol of an isotope of element R. C2 [1 mark]
(b) Element P reacts with element Q to form an ionic compound whereas element Q reacts with element R
to form a covalent compound. Explain how these ionic and covalent compounds are formed. C3
[8 marks]
(c) The ionic compound formed by the reaction between elements P and Q is able to conduct electricity
when it is dissolved in water. Describe how you could prove that this statement is correct. C6
[8 marks]

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