Hydrophobic and Hydrophilic

[kenhung123]

How do I know if part of the molecular is hydrophobic or hydrophilic?
I first thought hydrophobic means it can dissolve in non polar substances so it doesn't have any charge, but apparent CH3+ is considered hydrophobic

[kyzoo]

CH3+ is an ion, hence it can form ion-dipole bonds with water molecules

[Mao]

CH3+ is highly unstable, you won't class it as hydrophobic nor hydrophilic. Heck, if you can isolate CH3+, you'll probably get the next Nobel prize for chem.

[m@tty]

If you are referring to the neap test, it is a methyl group. It is hydrophobic because it is non-polar. Though there is probably some more precise reason soon to be given by Mao.

[Mao]

What is the original question from the paper?

[kenhung123]

CH3+ is an ion, hence it can form ion-dipole bonds with water molecules

Yea but isn't water polar?

What is the original question from the paper?

I can't find the question now. lol. Well I remember it was a diagram of molecule with various side chains and they asked to circle the part that is considered hydrophobic. Would this by any chance be one of those old questions more related to unit 4?

[Mao]

A methyl group would be considered hydrophobic. A methylium ion is a whole different matter.