Edexcel A-Level Chem Paper 1 Advanced Inorganic and Physical Chemistry [Exam Chat]

Because I'm in a generous mood, I have made some practice papers for you lot to use in your revision (note that I will NOT be making any more of these, because of how time consuming it is to do so - if you want more practice papers, you may have to make your own and I'd recommend using google docs if that is ever the plan).

Pages 1 - 24 on papers 1 and 2 are the question papers. Anything beyond that is the MS.
Pages 1 - 32 on paper 3 are the question paper and anything beyond that is the MS.

Disclaimer: these are NOT predicted papers or even remote attempts to guess what will actually come up. Anything that is not assessed on these practice papers could come up, so do not make these the entirety of your revision.

hi what would you guys recommend for me to do to go from roughly a B in paper 2 and 3 to an A* ?

Here are three ideas (the third should be already pretty obvious):

-Try using quizzes on sporcle.com for inorganic ion colours (paper 3) and organic reactions (papers 2 and 3).

-Try teaching others some of the harder topics.

-Use past papers regularly.

specifically the calculation questions for 12 14 and some equilibrium / topic 5

In my experience, it has been a matter of using ICE tables for equilibrium problems and using Red-Ox (i.e electrode potential = reduction electrode potential - oxidation electrode potential) for electrode potentials as well as regular use of past papers to familiarise myself with the methods required.

I have found that model answers were actually the way forward for a number of my classmates when I tried teaching them myself. Davies A level chemistry and Physics and Maths tutor should be the best places to look if you want to try and find some. Some used the calculations in chemistry book by Jim Clark (who also wrote ChemGuide, which has plenty of example calculations too, now that I mention it) and that worked beautifully for them.

Anyone have the locked specimen papers?

does anyone know if we have to know ALL of these? some of them like Zn, Ni thought we didn’t have to know😭

Any help with this question please 😩

Lol wtf… I thought weak base calculations were undergrad level. Alas, here’s what you do:

Consider the equilibrium constant Kh, which is the equilibrium constant for the given equation.

So Kh = [CH3COOH][OH^-]/[CH3COO^-]

A value of Kh can be found as follows:

Kh = Kw/Ka

This works because Kw = [H^+][OH^-] and Ka = [H^+][CH3COO^-]/[CH3COOH] in this case.

Using the relationship between pKa and Ka:

Ka = 10^-pKa = 10^-4.76

So Kh = 10^-14/10^-4.76 = 10^-9.24

Similarly to with weak acids, we assume that there is negligible hydrolysis of the CH3COO^- ion and that the concentration of the CH3COOH = OH^-, so we can use [CH3COO^-] = 1.00 mol dm^-3 and [OH^-] = [CH3COOH]

So Kh = [OH^-]^2/[CH3COO^-]

==> 10^-9.24 = [OH^-]^2/1.00
==> 10^-9.24 = [OH^-]^2
==> 10^-4.62 = [OH^-]

Using Kw again:

10^-14 = [H^+] x [10^-4.62]
==> 10^-9.38 = [H^+]

So pH = -log[10^-9.38] = 9.38

I’ve never seen a question like this or even anything like this on the spec ?

It isn’t on the spec. As I said, it’s undergraduate level material…

how come halides are reducing agents, i thought halogens lose an electron? sorry if this is a bit of a stupid question