Intermolecular forces Watch

kiiten
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#1
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When youre asked to talk about melting or boiling point what forces do you talk about?

E.g. are only certain forces/types of bonds involved in melting or boiling point?
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sulaimanali
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#2
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van der waals
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sulaimanali
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in some molecules : London forces (induced dipole dipole forces) which are also a type of van der waal...and some substances Hydrogen bonding
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kiiten
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(Original post by sulaimanali)
in some molecules : London forces (induced dipole dipole forces) which are also a type of van der waal...and some substances Hydrogen bonding
For bpt. do you talk about van der waals, dipole-dipole, H bonding.

For mpt = covalent, ionic bonds.

Metallic can be for both?

Is that correct?
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C_Yap
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Depends on the structure...

For simple molecular, talk about intermolecular forces between molecules:
- Van der Waals (more shells = bigger molecule = stronger VDW)
- Permanent dipole - permanent dipole (polar molecule = electrostatic attraction between molecules)
- Hydrogen bonding (strongest IMF, due to H bonding to N O or F)

For ionic, talk about attraction between oppositely charged ions in a lattice which can be affected by:
- charge of ion (higher charge = increased attraction)
- size of ions (smaller = stronger attaction between ions)

For metals talk about attraction between cations and delocalised electrons affected by:
- charge of ion (increased charge = more electrons per atom = greater attraction)
- Size of cation (more shells = bigger ion = less distance between ion and delocalised electrions = more attraction)

For giant covalent, talk about the fact that there are many strong covalent bonds needed to be broken, so MP/BP is high.


Sorry, I kinda rushed this. I hope I answered the question.
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kiiten
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(Original post by Baaah)
Depends on the structure...

For simple molecular, talk about intermolecular forces between molecules:
- Van der Waals (more shells = bigger molecule = stronger VDW)
- Permanent dipole - permanent dipole (polar molecule = electrostatic attraction between molecules)
- Hydrogen bonding (strongest IMF, due to H bonding to N O or F)

For ionic, talk about attraction between oppositely charged ions in a lattice which can be affected by:
- charge of ion (higher charge = increased attraction)
- size of ions (smaller = stronger attaction between ions)

For metals talk about attraction between cations and delocalised electrons affected by:
- charge of ion (increased charge = more electrons per atom = greater attraction)
- Size of cation (more shells = bigger ion = less distance between ion and delocalised electrions = more attraction)

For giant covalent, talk about the fact that there are many strong covalent bonds needed to be broken, so MP/BP is high.


Sorry, I kinda rushed this. I hope I answered the question.
So i can talk about these regardless if its asking about boiling point/melting it. Its just based on structure??
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