Chem question? (1 Viewer)

[renny 123]

What gives hydrocarbons (alkanes and alkenes C1-C8) their dispersion forces and non dipole-dipole nature?
If anyone could help me out it would be appreciated
thanks

 

[katie tully]

Hydrocarbons are nonpolar, because they lack the electron pull of oxygen or nitrogen. That's why hydrocarbons only exhibit weak disperson forces.

 

[katie tully]

Also; Hydrocarbons can be involved in London dispersion forces, which is when a temporary imbalance of electrons in a molecule creates a slight positive charge on one side of the molecule, and a slight negative charge on another side. This can then induce a similar dipole in a neighboring molecule, causing a very weak and short lived attraction force. This is generally only significant in very large molecules.

 

[lyounamu]

What gives hydrocarbons (alkanes and alkenes C1-C8) their dispersion forces and non dipole-dipole nature?
If anyone could help me out it would be appreciated
thanks

As katie mentioned, hydrocarbonds are non-polar, which means that the electrons are equally shared by the atoms. Therefore, they lack dipole-dipole nature because there are no dipoles.

Hydrocarbonds however do exhist dispersion forces which are just atoms interecting with the lone pairs of electrons in the environment. Larger the molecule, the higher dispersion forces due to more interections. That's why larger surface area = more dispersion forces generally. And when the temperature drops there is imbalance of sharing of electrons apparently (accroding to the bond video I watched), in that case, atoms become slightly dipole (temporarily due to the temperature) and more dispersion intereactions can be brought about.

I hope my mediocre chemistry knowledge helped.

 

[renny 123]

thanks

does anyone have a table of the alkenes C1-C8 boiling and melting points? I cant find one.

 

[Aerath]

Hydrocarbonds however do exhist dispersion forces which are just atoms interecting with the lone pairs of electrons in the environment. Larger the molecule, the higher dispersion forces due to more interections. That's why larger surface area = more dispersion forces generally. And when the temperature drops there is imbalance of sharing of electrons apparently (accroding to the bond video I watched), in that case, atoms become slightly dipole (temporarily due to the temperature) and more dispersion intereactions can be brought about.

I hope my mediocre chemistry knowledge helped.

What's wrong with you today? There are so many spelling mistakes in that paragraph it's unbelievable. You don't usually make many spelling mistakes. It's just....not you. =\

 

[lyounamu]

What's wrong with you today? There are so many spelling mistakes in that paragraph it's unbelievable. You don't usually make many spelling mistakes. It's just....not you. =\

May be it's not Namu himself who is writing this...who knows? I might be invading his room and typing random stuff on the internet.

 

[katie tully]

thanks

does anyone have a table of the alkenes C1-C8 boiling and melting points? I cant find one.

http://www.gcsescience.com/imeltorg.htm