Aqa chemistry unit 1 unofficial mark scheme

Thank you

I also think there was C16H34 to C8H18 + C2H4 + 2C3H6? Not sure though

Thank you

I also think there was C16H34 to C8H18 + C2H4 + 2C3H6? Not sure though

v) CCl2 had a bent shape. (1 mark)

V shape also ok?

Thanks for the mark scheme!

any idea on what the grade boundaries will be like

1i. Silicon ( 1mark), many/ strong (1 mark) covalent bonds which required a large amount of energy to break so a high melting point ( 1mark)

ii) Argon ( 1mark), smaller atomic radius/more protons (1 mark) and similar shielding (1 mark)

iii) Chlorine (1 mark)

iv) ClF3 had a t-shape (3 bond pairs and 2 lone pairs). Trigonal planar should also be accepted. CCl2 had a bent shape (2 bond pairs and 1 lone pairs). (2 marks)

v) CCl2 had a bent shape. (1 mark)

vi) 0.5 Cl2 + 1.5 F2 goes to ClF3 (1 mark)

2i) 5s2 4d10 5p4 (Any order) (1 mark)

ii) Calculation and you should get 127.8 (1d.p.) (3 marks)

iii) Presence of other isotopes ( 1 mark)

iv) Te+ (g) + e- goes to Te (g) (1 mark)

v) The 127 Te + had the largest relative abundance ( 1mark) and current is proportional to abundance as more of the isotope = more electrons transferred from the detector to the ion = greater current produced ( 1mark)

vi) The 128 Te + ( 1mark) had two electrons knocked out (ionised twice) so it has a m/z ratio of 64. (1 mark) (Have to say 128 isotope)

vii) Same atomic radius ( 1mark) same number of protons and electrons so same attraction between the protons and the electrons so same atomic radius ( 1mark)

3i) Macromolecular ( 1mark)

ii) No delocalised electrons to flow through the macromolecular crystal and conduct electricity ( 1 mark)

iii) Hydrogen bonding ( 1mark)

iv) Bond angle in H2O2 is 104.5 ( 1mark)

v) Show hydrogen bonding between h2o2 and h2o. ALL partial charges ( 1mark). ALL lone pairs so 2 on each oxygen atom ( 1 mark) and attraction between delta + on hydrogen atom and lone pair on the Oxygen atom in the water molecule. H-O-H should be linear (1 mark).

vi) Oxygen is more electronegative than Sulfur (1 mark) due to less shielding etc. This means H2O2 has hydrogen bonding while H2S2 only has pd-pd interactions. This means that the melting point of H2O2 is greater than H2S2 ( 1 mark)

Now I have forgotten the order of the questions lol so sorry.






Fuels containing Sulfur are removed so that SO2 is not produced ( 1mark) from the combustion of these fuels. SO2 contributes to acid rain ( 1 mark).

Poly (propene) can be made from propene. ( 1mark)

Functional group isomer of propene was cyclopropane ( 1mark).

2,4-dichloro-2,4-dimethylhexane (1 mark)

The water of crystallization has 6 water molecules so x is 6 ( 3marks)

Evaporate the niso4.6h2o to constant mass ( 2marks)

SiO2 + 6HF -----> H2SiF6 + 2H2O ( 1mark)

C16H34 ----------> C8H18 + C2H4 + 2 C3 H6 ( 1mark)













Balance the equation ( 1mark)

Arrow from the N-N^- bond donated to the negative Nitrogen Ion ( 1mark)

N2O ( 1mark) (Other compounds will be accepted but this was the most obvious one)

MgN6 ( 1 mark)

55-57 for an A, imo

Was 2v not 128

The answer was the one with the highest peak but I have forgotten the answer sorry! But it may have been 128

I hope its like that, misread some of the questions and lost marks.
someone told me it would be 62/70 for A

The answer was the one with the highest peak but I have forgotten the answer sorry! But it may have been 128

What's the total amount of marks on the paper? 75 or 70?

Angle of h202 i I put 104.5 because it looked bent but internet States its 109.5

Many isomers exist of C8h18 Draw:2,3,3-trimethylypentane (1mark)
3 HNO3>>>> HNO3+ 2 NO + H20 (1mark)

Bonding of sodium and nitrogen I think which was ionic (3marks)
For last page I wrote Cl2 chlorine molecule because this has 17 electrons like n3- ion.

No problem

I believe that is fine but I am not sure so I won't put it in just in case it is wrong and I am misleading people. I think it is right however

for relative atomic mass did anyone get 127.8


i didnt like how they didnt put numbers at the side, i dont understand why they made changes to all the questions in order to make them more complicated to previous years, its like they want us to do bad