Question

compare and contrast three different physical properties of ionic and covalent compounds

Answer 1

Melting and Boiling point : Ionic Compounds usually have high melting point than covalent compounds. It is because intermolecular forces in ionic compound is high electrostatic forces , and because of this ionic compounds can form Crystal lattice whereas covalent compound is formed by the overlapping of orbital. hence high energy is required to break the bond in ionic compound than covalent . NaCl has very high melting point whereas O2 a covalent molecule has got very low melting point.

Electrical Conductivity : Ionic compounds are good conductor of electricity both in molten and its aqueous state but covalent Compounds are usually poor conductor of electricity . It is because ionic compound exist in the forms of ion which is highly mobile whereas electrons in covalent compound gets localized . Example NaCl is good conductor in molten and aqueous state but CO2 a covalent molecule does not conduct electricity.

Solubilty : Ionic Compounds are usually soluble in water because it gets easily dissociated into its ion in polar solvent like water and it is due to high hydration enthalpy but covalent Compounds are either insoluble or partially soluble in water. for instance NaCl dissolve in water but CCl4 is insoluble

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