Edexcel iGCSE Chemistry - 19th May 2016 - Predictions?

Was the backward reaction endo or exo? I wrote endo
And what equation was the right one ? I wrote 3 because it should have half the moles...

For the difference, I put: Solution Y may have had a higher initial temperature.


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For water I put:
To remove residual solution X
For solution Y I put:
To remove water
For why there is a difference I put:
Solution Y has a lower concetration

The exam was actually pretty easy. That being said, hope they don't make paper 2 hard!


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There was hardly any organic chemistry on it! no blast furnace, no electrolysis, no iron or aluminium extraction.... FFS all the things i revise somehow are not in the test. Cheers edexcel you snakes

There was hardly any organic chemistry on it! no blast furnace, no electrolysis, no iron or aluminium extraction.... FFS all the things i revise somehow are not in the test. Cheers edexcel you snakes

Does anyone understand the difference between HCl in water and methylbenzene?

Yes - that's the 'soluble + soluble' to make an insoluble salt (precipitate).

The other methods are:

'acid + excess base' which I think is just a solid (ie insoluble) added to an acid, which you then filter and use the four step method to obtain a pure, dry sample

'titration - between an acid and an alkali if they you don't know the concentration of one or both' - it uses a soluble base

I think it will be fairly obvious in the test, but if you have two aqueous solutions and you are obtaining a solid, do the precipitation reaction. If you have a solid and some acid, do excess base. If you have an unknown concentration of acids and/or alkalis, do a titration

Based on past papers, I'd say it's most likely to be a titration...

Good luck