Because oxygen is more electronegative than carbon, an O-H bond has a larger bond dipole than a C-H bond. Hence the force of attraction between two water molecules is greater than it is between two methane molecules. Water has the higher boiling point. … Therefore, methane has the higher boiling point.
Does water have a higher melting point than methane?
Water has a higher boiling point because the hydrogen bonds that form among water molecules are stronger than the Van der Waals interactions among methane molecules, thus more energy must be provided in order to break the hydrogen bonds and allow the water molecules to escape the liquid state.
Why is the melting point of methane so low?
Alkanes have low melting or boiling points because of the very weak intermolecular forces between alkane molecules. Methane, ethane, propane, and butane are gases at room temperature. … This means that there are more (relatively) stronger intermolecular forces between the molecules.
Why does water have a higher melting point than most covalent molecules?
Explanation. There are intermolecular forces between simple molecules. … The intermolecular forces between water molecules are stronger than those between oxygen molecules. In general, the bigger the molecule, the stronger the intermolecular forces, so the higher the melting and boiling points.
Why is boiling point of methane CH4 lower than water?
Methane (CH4) has a lower boiling point than water. Water has a higher molecular weight than methane. The intra- molecular force in water molecule is much stronger compared top the intra- molecular force between a carbon and a hydrogen in methane.
Is water attracted to methane?
Methane is a gas, and so its molecules are already separate – the water doesn’t need to pull them apart from one another. … The only attractions possible between methane and water molecules are the much weaker van der Waals forces – and not much energy is released when these are set up.
Do alkanes have higher boiling points?
The boiling points of alkanes increase with increasing number of carbons. This is because the intermolecular attractive forces, although individually weak, become cumulatively more significant as the number of atoms and electrons in the molecule increases.
What has the highest boiling point?
Carbon has the highest melting point at 3823 K (3550 C) and Rhenium has the highest boiling point at 5870 K (5594 C).