Table of Contents
- 1 Why does water have a higher boiling point than Group 6 hydrides?
- 2 Why does boiling point increase down Group 6?
- 3 Why does water have a higher boiling point than hydrogen fluoride?
- 4 Why do boiling points of halogens increase down the group?
- 5 Why does the basicity of hydrides decrease down the group?
Why does water have a higher boiling point than Group 6 hydrides?
(1) The hydrogen bonding ability of H2O which increases the boiling point. The partial charges, induced by the higher electronegativity of oxygen, mean that the hydrogens and oxygens will be attracted to one another by coloumbic forces.
Why are the boiling points of Group 4 hydrides lower than hydrides of groups 5/6 and 7?
All the group 4 hydrides have a regular tetrahedral shape and are non-polar. The only intermolecular forces between such molecules are weak van der Waals’ forces. These generally increase with increasing relative molecular mass.
Why does boiling point increase down Group 6?
The increase in boiling point happens because the molecules are getting larger with more electrons, and so van der Waals dispersion forces become greater.
Why does water have a high boiling point?
Water has an unusually high boiling point for a liquid. Water is made up of oxygen and hydrogen and can form hydrogen bonds, which are particularly strong intermolecular forces. These strong intermolecular forces cause the water molecules to “stick” to one another and resist transition to the gaseous phase.
Why does water have a higher boiling point than hydrogen fluoride?
Water molecules form a bulky molecule and it is very difficult to break its bonds. To break all its bonds, a large amount of the energy is required. Thus, $H2O$ has a higher boiling point than HF.
Why water has higher boiling point than ammonia?
Water as a “perfect” example of hydrogen bonding + hydrogens and lone pairs so that every one of them can be involved in hydrogen bonding. This is why the boiling point of water is higher than that of ammonia or hydrogen fluoride.
Why do boiling points of halogens increase down the group?
The melting points and boiling points of the halogens increase going down group 7. This is because, going down group 7: the molecules become larger. more energy is needed to overcome these forces.
Why boiling point of water is higher than ammonia?
Why does the basicity of hydrides decrease down the group?
In group 15, the hydrides have a lone pair on the central atom. Going down the group, size of the atom increases. And hence, electron density over the group 15 elements decreases. Thus tendency to donate electrons decreases and basicity decreases.
Which of these hydrides has the highest boiling point?
In hydrides of group 16 , H2O has highest boiling point . It is due to extensive H–bonding which exist even in liquid state.