posted by Samantha .
Which member in each pair has the stronger intermolecular dispersion forces?
CH3CH2CH2I or CH3CH2I
or neither? how do you know this
Dispersion forces increase with increasing molar mass. Compound I has a longer chain than compound II; those chains can get tangled easier if they are longer.
so chain 1 has more dispersion force?
and would the same be for CH3CH2CH2Cl or CH3CH2Cl where the first one has more df?
yes and yes
thanks! also what does a compound have to have to have dipole-dipole and also dispersion forces
Identify the type or types of intermolecular forces present in each substance.
hydrogen peroxide, HOOH
i put dispersion forces and hydrogen bonding. but its wrong. is it also dipole dipole?
Long chains give dispersion forces (more complex molecules). For a dipole-dipole you want something with a difference in electronegativity. CH3CH2CH2CH2OH might be an example of dipole-dipole as well as dispersion forces. Here is a link you can read about them.
I think the H2O2 molecule is too small to have anything but miniscule dispersion forces.
CH3CH2CH2CH2CH2Cl is an example of a compound with dispersion and dipole-dipole attractions.