Why CH4 has higher melting point than SiH4?

The bigger molecular weight of SiH4 than CH4 makes the SiH4 molecule larger than CH4. Because of this, SiH4 requires larger kinetic energy to break these dispersion forces before the molecules can convert to vapor. This explains why the boiling point of SiH4> boiling point of CH4.

Which has higher boiling point SiH4 or CH4?

The strength of these forces increases with the number of polarizable electrons and therefore usually increases with molecular weight of the molecule. SiH4 molecules have a greater number of electrons (greater molecular weight) than CH4 molecules. Hence boiling point of SiH4 is greater than boiling point of CH4.

Why does methane have a higher boiling point than silane?

Methane and silane are non-polar, because of the tetrahedral shape and also the small electronegativity differences. Because these don’t have dipole-dipole forces, the boiling point will depend on how strong the London forces are. Silane is heavier, so it has bigger London forces and a higher boiling point.

What causes the difference in boiling point for CH4 SiH4 and GeH4?

The ordering from lowest to highest boiling point is expected to be CH4 < SiH4 < GeH4 < SnH4. All of these compounds are nonpolar and only have London dispersion forces: the larger the molecule, the larger the dispersion forces and the higher the boiling point.

Why does CH4 have such a low melting point?

Intermolecular forces between methane molecules C-H bonds are very weakly polarized because electronegativity difference between carbon and hydrogen atoms are very small. So their dipole – dipole interactions are too weak.

What is the melting point of SiH4?

-301°F (-185°C)Silane / Melting point

Why does ch4 have a low melting point?

Does CH4 or GeH4 have a higher boiling point?

The bigger the atoms, the more polarisable their electron clouds and the greater the dispersion forces. Hence boiling points are in order: SnH4 > GeH4 > SiH4 > CH4.

What is the melting point of CH4?

-295.6°F (-182°C)Methane / Melting point

Why does SiH4 have a higher boiling point than CH4?

The bigger molecular weight of SiH4 than CH4 makes the SiH4 molecule larger than CH4. Because of this, SiH4 requires larger kinetic energy to break these dispersion forces before the molecules can convert to vapor. This explains why the boiling point of SiH4> boiling point of CH4.

Why does CH4 evaporate faster than other compounds?

Another reason is that CH4 is significantly less massive than the other compounds. Evaporation requires energy to escape the liquid state. The bigger the molecule, the more energy, which generally will require a higher temperature if other effects are similar.

Why does CCl4 have a lower boiling point than CHCl3?

Re: Boiling Point Dipole forces are the dominant intermolecular forces of attraction between CHCl3 molecules while the dominant intermolecular forces of attraction within CCl4 molecules are London forces. So CCl4 will have the lower boiling point as less energy is needed to overcome the London forces between them.

Why does silane have a higher melting point than methanol?

Methane is the lightest, but also has very weak IMF. It doesn’t have many polarizable electrons. Silane is heavier (so you’d expect a higher m.p.) but it also has several more shells of electrons, so in this case the IMF wins out, and the melting point is decreased.