Chad incongruity (IMF forces)

[datstudy1]

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Hey, guys. I had a chem question I needed to clarify:

If one adds an impurity, Fp decreases, Bp increases and Vp decreases.

For increasing IMF (ex.solids) Fp INCREASES?, Bp increases and Vp decreases.

This is the logic my Kaplan teacher/ other science boards taught me, but Chad says that for increasing IMF, Fp decreases.

Can someone tell me which is right?

Thanks.

 

[txlotusboys37]

IMF (intermolecular forces? right)... I think what chad is saying is that if you increase IMF, then the feezing point will keep getting lower/must get colder in order to freeze. (for example, lets say that increasing the IMF causes the following change in FP: going from -1 degree to -10 degree would be a decrease in fp)

I think this is essentially what they're trying to say at Kaplan, which makes it confusing the way they're putting it.

now, anyone...feel free to correct me if i'm wrong, I took the DAT 6mos ago and so it's definitely not fresh on my mind, coupled with the fact that I've been accepted to dental school so I've pretty much let this stuff slip from my mind.

 

[sundaequeen]

When did Chad say that Fp decreases with increasing IMF? It should definitely increase because there is more IMF, so the molecules will want to stick together more and thus freeze more easily, at a higher temperature. Or if you look at Mp which is the same as Fp, the molecules stick together more so it take higher temperature to melt it.

 

[blackberryman]

I dont remember Chad mentioning this?

I remember chad mentioning: if IMF increases: MP, BP, Viscosity, Surface Tension Increase But Vapor Pressure Decreases.

Which video are you referring to you OP?