That's why ionic compounds have much higher melting and boiling points than covalent molecules. The strong force of attraction between oppositely charged ions means that ionic compounds have high melting and boiling points. The electrostatic attraction (ionic bond) between cations and anions is strong. b) Explain why mercury has a surface tension that is six times greater than the surface tension of water. Ionic compounds have high melting points because there is a strong electrostatic force of attraction between the oppositely charged ions and hence a large amount of energy is required to break the strong bonding force between ions. Ionic compounds have an equal number of positive and negative ions arranged in the three-dimensional lattice due to which they have high melting points. Ionic compounds have high melting points. It clearly requires high temperatures. hence the MP of ionic compounds and more than covalent or other compounds. 7. a) Describe metallic bonds. Well, it's usually high. 1:44 know that a covalent bond is formed between atoms by the sharing of a pair of electrons Ionic compounds usually form hard crystalline solids with high melting points. Ionic compounds have much melting point than other compounds becoz it is formed by interaction between positive and negative charges.its bond is much stronger than other bonds so it becomes difficult to break the ionic bond. 1. Ionic compounds have an equal number of positive and negative ions arranged in the three-dimensional lattice due to which they have high melting points. It takes a lot of energy to overcome this attraction in order to allow the ions to move more freely and form a liquid. 1:42 understand why compounds with giant ionic lattices have high melting and boiling points; 1:43 Know that ionic compounds do not conduct electricity when solid, but do conduct electricity when molten and in aqueous solution (g) Covalent bonding. Ionic compounds are non-molecular species, and melting requires that the strong ionic bonds that constitute the electrostatic lattice be disrupted. The strong intermolecular attraction is also the reason ionic compounds are mostly solid at room temperature. Covalent molecular compounds, in contrast, consist of discrete molecules held together by weak intermolecular forces and can be gases, liquids, or solids at room temperature and pressure. Physical Properties of Ionic Compounds: High Melting Point. Ionic compounds have high melting and boiling points because the ionic bonds that hold the compounds together are very strong and require a great deal of energy to break apart. This is directly correlated to their high melting points. ionic compounds are formed by transfer of electrons from a metal to a non metal and are held Together by strong electrostatic force between the oppositely charged ions. This means that Ionic compounds will have a higher melting and boiling point. 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