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Hydrogen Sulfide Low Melting Point Reasons
The reason why the melting point of hydrogen sulfide is low
The melting point of hydrogen sulfide is quite low, covered by the following reasons.
First, in terms of the force between its particles. Hydrogen sulfide is composed of molecules, and there is a van der Waals force between molecules. Compared with ionic bonds, covalent bonds, etc., the van der Waals force is very weak. In ionic compounds, ions are connected by strong ionic bonds. To melt them, it is necessary to break this strong bond, which requires huge energy consumption, so the melting point is quite high. The hydrogen sulfide molecule is only maintained by van der Waals force, and less energy is required to increase the molecular spacing, showing a molten state, so the melting point is low.
Furthermore, look at its molecular polarity. Although hydrogen sulfide molecules are polar, their polarity is weak. According to common sense, the stronger the polarity of the molecule, the greater the intermolecular force. Such as water molecules, the polarity is very strong, and there are hydrogen bonds between molecules in addition to van der Waals force, resulting in a large increase in intermolecular force and a relatively high melting point. Hydrogen sulfide due to its weak polarity, the intermolecular force is limited, which is not enough to increase its melting point.
Also, in terms of its relative molecular mass. Relative molecular mass affects the size of the van der Waals force. Usually, the larger the relative molecular mass, the stronger the van der Waals force. Hydrogen sulfide has a smaller relative molecular mass and a weaker van der Waals force. For example, compared with similar molecules with large relative molecular mass, less energy is required to overcome the intermolecular force, so the melting point is low.
In summary, the interaction force between particles is weak, the molecular polarity is not strong, and the relative molecular mass is small, which is due to the low melting point of hydrogen sulfide.
The melting point of hydrogen sulfide is quite low, covered by the following reasons.
First, in terms of the force between its particles. Hydrogen sulfide is composed of molecules, and there is a van der Waals force between molecules. Compared with ionic bonds, covalent bonds, etc., the van der Waals force is very weak. In ionic compounds, ions are connected by strong ionic bonds. To melt them, it is necessary to break this strong bond, which requires huge energy consumption, so the melting point is quite high. The hydrogen sulfide molecule is only maintained by van der Waals force, and less energy is required to increase the molecular spacing, showing a molten state, so the melting point is low.
Furthermore, look at its molecular polarity. Although hydrogen sulfide molecules are polar, their polarity is weak. According to common sense, the stronger the polarity of the molecule, the greater the intermolecular force. Such as water molecules, the polarity is very strong, and there are hydrogen bonds between molecules in addition to van der Waals force, resulting in a large increase in intermolecular force and a relatively high melting point. Hydrogen sulfide due to its weak polarity, the intermolecular force is limited, which is not enough to increase its melting point.
Also, in terms of its relative molecular mass. Relative molecular mass affects the size of the van der Waals force. Usually, the larger the relative molecular mass, the stronger the van der Waals force. Hydrogen sulfide has a smaller relative molecular mass and a weaker van der Waals force. For example, compared with similar molecules with large relative molecular mass, less energy is required to overcome the intermolecular force, so the melting point is low.
In summary, the interaction force between particles is weak, the molecular polarity is not strong, and the relative molecular mass is small, which is due to the low melting point of hydrogen sulfide.
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