what is the reason for this difference in melting points?
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The difference in melting point can be attributed to the difference in the strength of intermolecular interactions between the metal atoms. stronger the forces,higher will be the melting points.
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ionic compound has high melting points because the electrostatic attraction needs a great deal of heat to break the energy. the ionic compound particles vibrate, with enough energy the electrostatic attraction breaks and the solid starts to melts.
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Magnesium Oxide (MgO) has a higher melting point than Sodium Chloride (NaCl) which is around 2,800 degrees Celcius. This is because its Mg2+ and O2- ions have a greater number of charges, and so form stronger ionic bonds, than the Na+ and Cl– ions in Sodium Chloride.
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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. The strong force of attraction between oppositely charged ions means that ionic compounds have high melting and boiling points.
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Ionic compounds have high melting and boiling points, so they are in the solid state at room temperature. ... some forces are overcome during melting. all remaining forces are overcome during boiling.
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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.
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The presence of impurities in a substance results in a lower melting point due to a process called melting point depression. Melting point depression is the reason why adding salt to frozen streets helps to melt the ice. Melting point depression occurs due to the nature of a material's solid state.
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The melting point of a pure substance is always higher and has a smaller range than the melting point of an impure substance or, more generally, of mixtures. ... They melt sharply at a constant temperature to form a liquid of the same composition.
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Different groups exhibit different trends in boiling and melting points. For Groups 1 and 2, the boiling and melting points decrease as you move down the group. For the transition metals, boiling and melting points mostly increase as you move down the group, but they decrease for the zinc family.
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If the lattice energy (cost) is larger than the energy of solvation of the ions (gain) the compound won't dissociate, and it will be insoluble. There is a large grey area where lattice energy and solvation energy are close, and for those compounds temperature has a big influence on solubility.
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Answer and Explanation: Melting is an endothermic reaction in which the total amount of heat in the substance, also known as the enthalpy, increases.
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The boiling point and melting point of a compound do not change the solubility. But there are possible correlations. Both dissolving and melting a compound break the inter-molecular bonds between the molecules, replacing them by more flexible interactions in the fluid.
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mercury (a metal) has a low melting point and exists as a liquid at room temperature. elements in group 1 have low melting points, but also low densities, for example, sodium is less dense than water and so it floats.
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Ionic compounds have high melting and boiling points, so they are in the solid state at room temperature.
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If a different solvent were used, the Rf value would not be the same because, depending on the solvent, there is a difference in solubility. If a different solvent was used, the relative positions of the bands would be different.
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Key Points Ionic compounds are formed from strong electrostatic interactions between ions, which result in higher melting points and electrical conductivity compared to covalent compounds. Covalent compounds have bonds where electrons are shared between atoms.
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Ionic compounds typically have much higher melting points than molecular compounds. ... To melt a molecular substance, you need to break these weak intermolecular forces between neutral molecules, which is why ionic compounds generally have much higher melting points than molecular compounds.