AQA A Level Chemistry Paper 1 4th June 2019 Unofficial Markscheme Paper 1

don't you need to multipying the 107 by 2? for the atomisation enthalpy change of iodine.

what was the shape of POCl3 btw??
Ik that ClF3- was square planar with 90degrees

Feel free to add yours answers and then I can order them
I got (in no order)
192000 for the Kp question
169 for the relative molecular mass
750 for the ideal gas law equation
4.3 for the buffer solution
46.4% for the titration
333Kjmol-1 for the entropy
107 for atomisation


1.1) Equations- Cd(s)+ 1/2I2(s) and then Cd+(g)+e-+I
1.2) 107 (bit of a debate about this one)
1.3) Some covalent character?
1.4) 333kJmol-1 and since G>0, its not feasible

Acids and Bases Question:
4.57 * 10^-14
4.30
The third box on the table
For Ka- had to use half neutralisation point but can't remember what I got


Question with the Fe complexes
Fe(OH)3(H2O)3
Brown Colour
2[Fe(H2O)G]3+ + 3CO32- => 2[Fe(H2O)3(OH)3] + 3CO2 +3H20
FeCl3? and then equation with 3 Cl-
Fe(H2O)4(OH)2 and green precipitate

Question about Period 4
Most electronegative- Bromine
Potassium had the smallest atomic radius due to least number of protons- least attraction between outer shell of electrons and the nucleus
Amphoteric

Titration
Percentage by mass of carbon is 46.4%
To increase the accuracy- use a larger mass of solid or less concentrated thiosulphate
Iodine acts as the oxidising agent?
Its white because it has a full d orbital and so, cannot absorb any light and emits all of it so looks white

These are all the maths ones (almost) so feel free to add

defo 107 i checked by recalculating the cycle

Did anyone get the iron complex + HCL

Did anyone get the iron complex + HCL

I thought atomisation was already set for 1/2?

(FeCl4)- looked right ?

Oh well done, was just losing hope

I also did x2

What was the answer to the relative mass of Q - i put 170