1 | Table 11 shows the proton number of atoms P, Q and R. | |||||||||
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a) | Based on electron arrangement, explain the formation of chemical bond between | |||||||||
i) | element P and element P [5 marks ] | |||||||||
ii) | element Q and element R [7 marks ] | |||||||||
b) | Gas P reacts with element Q to produce a white solid. | |||||||||
i) | Write a chemical equation for the reaction between gas P and element Q. | |||||||||
ii) | State three physical properties of the white solid. [ 4 marks] ] | |||||||||
c) | What is the position of element Q in the Periodic Table of the elements? Explain how you obtain your answer. [ 4 marks ] |
Suggested Answer:
1 | a)i | 1. Two atoms of P combine through covalent bond. 2. Each atom of P needs two more electrons to achieve octet electron arrangement. 3. Each atom of P contributes two electrons to each other for sharing. 4. Two atoms of P share two pairs of electrons. 5. A double covalent bond is formed.  |
ii) | 1. Atom Q and atom R combine through ionic bond 2. To achieve octet electron arrangement, 3. atom Q with 6 valence electrons loses two electrons to form Q2+ ion 4. Two atom R, each atom with 7 valence electrons gain one electron to form R- ion. 5. Q2+ ion and R- ion are attracted to each other by strong electrostatic force.1 Diagram | |
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b)i | 2Q + P2 --> 2QP | |
ii) | Have high melting point Usually soluble in water Conduct electricity in the molten state or aqueous solution. | |
c) | 1. Element Q is located in Group 2 2. because it has two valence electrons 3. Element Q is located in Period 3 4. because it has three shells occupied with electrons |
Would you just give the answers, please? I'm trying to write an essay here. Thank you.
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