b) List down all the noble gases
c) State the electronic configuration of each of the noble gases you mentioned in (b)
d) Why are the noble gases chemically unreactive?
2) The electronic configuration of three element X, Y and Z are shown in Table 1
a) Explain why Z does not react with X and Y
b) X reacts with Y to form a compound with a high melting point. Explain why this is so.
c) i) Suggest the electronic configuration of an element P that will react with X to form a covalent compound with the formula PX4.
ii) Draw the arrangement of electrons in a molecule of this compound
d) State two properties of the compound in (c)
e) State two difference between ionic bond and covalent bond
ESSAY QUESTION
1 a) Using a suitable examples, discuss how the following covalent bonds are formed
i) Double bond
ii) Triple bond [14 m]
b) i) Give two examples f organic solvents
ii) Give one use of two other organic solvents.
2) a) When potassium reacts with an element from Group 17 of the periodic table, a compound is formed. Explain in terms of electron arrangement, why this compound has hight melting and boiling points [ 8m]
b) Describe how covelent bond are formed using HCI as an example [6]
c) Draw the electronic structure of chlorofomr CHCl3 and state the type of bonding involved [3 m]
d) Explain why hydrogen chloride does not conduct electricity when dissolved in chloroform but conduct electicity when dissolved in water [ 3m ]
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