Edexcel - Chemistry Unit 2 - 4 June 2013

Guys do we need to know any apparatus for experiments? Like how to set-up an experiment with labelled diagrams? If so, please explain what we need to know! Thanks!

Boiling point in halogenoalkanes, it is the one with the longest chain that has the highest ? and is it higher than alkanes?

We have to wait till tomorrow to discuss it right?


Posted from the TSR iPad app

Yes, longer --> more electrons --> stronger London forces.
Halogenoalkanes do have a higher boiling point that alkanes because they also have permanent dipole - permanent dipole interactions.

Can somebody please answer, thanks!

Distillation apparatus
Apparatus for preparation of halogenoalkane
Apparatus for refluxing
Apparatus for distilling your product
Apparatus for collecting gas over water

You should be safe with these. Let me know if you need to know what one looks like and I'll draw it out but please don't ask for all haha


Posted from TSR Mobile

Here's your answer:







It's colourless in acid, pink in neutral conditions and red in alkali.

Guys I don't know why Fluoromethane is insoluble in water? I know the rule about Haloalkanes being insoluble but surely Fluorine can hydrogen bond with the H atoms in Water molecules? Help please. Thanks!

I am confused about this too.

I though any molecule that can form hydrogen bonds with water or that can react with water is soluble?

Maybe the pd-pd bond is too strong to break to dissolve?

I understand it now, it's because of the lack of a delta positive Hydrogen atom in Fluoromethane.