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Chemical Bonding

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Chemical Bonding
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1.
|Substances |Type of bonding |Type of structure |
|H2O |Covalent |Simple molecular |
|SiCl4 |covalent |simple molecular |
|RbCl |ionic |giant lattice/ionic |
|Si |covalent |giant molecular |
|SiO2 |covalent |giant molecular |
|HCl |covalent |simple molecular |
|P4 |covalent |simple molecular |
|S8 |covalent |simple molecular |
|Al2O3 |ionic |giant lattice/ionic |
|AlF3 |ionic |giant lattice/ionic |
|AlCl3 |covalent |simple molecular |

2. (a) Krypton (noble gas) and Rubidium (Group I metal) Kr has a simple molecular structure and Rb has a giant metallic structure. Larger amount of energy is needed to overcome the stronger electrostatic attraction between Rb+ and its mobile electrons than the weaker van der Waals' forces between Kr atoms . Hence, boiling point of Rb is higher than that of Kr.

b) AlF3 and PF3 AlF3 has a giant ionic structure and PF3 has a simple molecular/ covalent structure. Larger amount of energy is needed to overcome the stronger electrostatic attraction between Al3+ and F( ions in AlF3 than the weaker intermolecular forces (or van der Waals' forces/ permanent dipole –permanent dipole attraction) between PF3
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