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AQA Chemistry Unit 1 23rd May 2014 Unofficial Markscheme

HI YOU CAN ALL ADD TO THIS BECAUSE I'M CRAP

1) 1.6734 x10-24g (1 mark)
neutron (1mark)
1)b)ii) Isotopes only vary the number of neutrons. The electron configurations are the same in both isotopes and this is what determines chemical reactions, therefore they have similar reactions. (1 mark)

1)c) Since Boron is group 3, you'd expect the first 3 to have close values. Probably anything between 4000-8000. (1 mark)

1)d) B+(g) --> B2+(g) + e- (1 mark)

1)e) It takes more energy to remove an electron from a charged ion than and atom, and also the second electron will be in an s subshell rather than p subshell, so it is marginally closer to the nucleus. (1 mark)

2) Boron 10 was 20% abundant (2 marks)
3)d block (1 mark)
metallic bonding, strong electrostatic forces between positive ion lattice and delocalised electrons require a large amount of energy to be broken (3 marks)
nickel is ductile because layers of similar sized, regular arranged ions easily slide over eachother (1 mark)
electron configuration (i have no idea) 1s2 2s2 2p6 3s2 3p6 4s2 3d6? (1 mark)
coefficients on equation 1, 6, 1, 6, (or something?) (1 mark)
calcium oxide or calcium carbonate? (1 mark)
4) hydrogen bonding. (1 mark)
Ammonia molecule with 1 lone pair attracted to the hydrogen of another one/ Hydrogens were all slightly postively charged, nitrogen negative.

Dative covalent bond (/co-ordinate bond) both bonding electrons in the pair from the nitrogen atom (1 mark)
electronegativity is the ability of an atom to attract the electrons in a covalent bond (1 mark)
LiF (1 mark)
CH4? (1 mark) or BH3?


5) petroleum/crude oil (1 mark)
fractional distillation (1 mark)
oxygen and nitrogen from the air react under high temperatures to make nitrous oxides (1 mark)
2NO + O2 --> 2NO2 (1 mark)
C12H26 --> C6H12 + C6H14 (1 mark)
empirical formula was C3H7 (1 mark)
zeolite catalyst? (1 mark)
C n H 2n+2
2,2,3,3,4,4 hexamethylhexane?? (1 mark) (2,2,3,3,4,4,hexadimethylhexane? ?)
chain isomerism (1 mark)
Cl2 (1 mark)
(endpart) dodec-1-ene? (1 mark)
6)1.23 moldm-3, (5 marks)
71% (1 mark)
6Ca(OH)2 + 4H3PO4 ----> 2Ca3(PO4)2 + 12H2O
x=2 (4 marks)
7) trigonal pyramidal 107 degree angle, (4 marks)
ionic crystal with strong electrostatic forces between oppositely charged ions which require a lot of energy to overcome.(3 marks)
Tl + 1/2Br2 => TlBr (1 mark
(edited 9 years ago)

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Original post by _Caz_
HI YOU CAN ALL ADD TO THIS BECAUSE I'M CRAP

1)
2) Boron 10 was 80% abundant
3
4
5) (endpart) dodec-1-ene?
6)1.23 moldm-3, 71% x=2
7) trigonal pyramidal 107 degree angle

Was 1b) B (neutron is not deflected)
Original post by _Caz_
HI YOU CAN ALL ADD TO THIS BECAUSE I'M CRAP

1)
2) Boron 10 was 80% abundant
3
4
5) (endpart) dodec-1-ene?
6)1.23 moldm-3, 71% x=2
7) trigonal pyramidal 107 degree angle


Boron 10 was 20% abundant
Original post by _Caz_
HI YOU CAN ALL ADD TO THIS BECAUSE I'M CRAP

1)
2) Boron 10 was 80% abundant
3
4
5) (endpart) dodec-1-ene?
6)1.23 moldm-3, 71% x=2
7) trigonal pyramidal 107 degree angle

Also i thought the end of Q5 it was a chain isomer because it asked for a structural isomerism?
2) is wrong. The Ar was 10.8, so 10B was 20%
Reply 5
Avatar for bradlydc
bradlydc
9
Original post by _Caz_
HI YOU CAN ALL ADD TO THIS BECAUSE I'M CRAP

1)
2) Boron 10 was 80% abundant
3
4
5) (endpart) dodec-1-ene?
6)1.23 moldm-3, 71% x=2
7) trigonal pyramidal 107 degree angle


Boron 10 was 20% abundant.Because 10*80+11*20/100 = 10.2
Reply 6
Avatar for _Caz_
_Caz_
OP
10
Original post by bradlydc
Boron 10 was 20% abundant.Because 10*80+11*20/100 = 10.2


I have no idea why I had written 80 there because I even wrote 20 in the exam sorry guys! I'll change it now - thanks for pointing that out.
Reply 7
Avatar for than4711
than4711
1
i remember 1 question asked about why nickel is ductile.
Reply 8
Avatar for alikhaliq
alikhaliq
was it chain isomerism?
Reply 9
Avatar for bradlydc
bradlydc
9
Original post by alikhaliq
was it chain isomerism?


Yes it was chain because the chain length had changed
Can anyone show me how you got the concentration of the Nitric Acid as 1.23moldm^-3? Thanks
Original post by alikhaliq
was it chain isomerism?


Yes
Reply 12
Avatar for _Caz_
_Caz_
OP
10
updated it a bit more. :smile: thanks everyone
What did everyone get for then name of the chain isomer ..... I got something like 2,2,3,3,4,4-hexa methyl hexane :tongue:


Posted from TSR Mobile
Original post by _Caz_
HI YOU CAN ALL ADD TO THIS BECAUSE I'M CRAP

1)
neutron
d block
metallic bonding, strong electrostatic forces between positive ion lattice and delocalised electrons require a large amount of energy to be broken
nickel is ductile because layers of similar sized, regular arranged atoms easily slide over eachother
2) Boron 10 was 20% abundant
3) Was this the ammonia question? If so it was hydrogen bonding. Ammonia molecule with 1 lone pair attracted to the hydrogen of another one/ Hydrogens were all slightly postively charged, nitrogen negative.
2NO + O2 --> 2NO2
4
5) 2,2,3,3,4,4 hexamethylhexane??
chain isomerism
(endpart) dodec-1-ene?
6)1.23 moldm-3,
71%
x=2
7) trigonal pyramidal 107 degree angle,
ionic crystal with strong electrostatic forces between oppositely charged ions which require a lot of energy to overcome.

I nelieve that on one of the parts with the dodecane question, the molecule was Cl2 ?
Reply 15
Avatar for _Caz_
_Caz_
OP
10
Original post by Potatosandwich98
I nelieve that on one of the parts with the dodecane question, the molecule was Cl2 ?


Okay :smile: I'll add it on. Cheers
Original post by NBrooks19
Can anyone show me how you got the concentration of the Nitric Acid as 1.23moldm^-3? Thanks


You needed to work out the Phosphoric acid not the nitric acid.

Posted from TSR Mobile
Reply 17
Avatar for Acermase
Acermase
Original post by _Caz_
Okay :smile: I'll add it on. Cheers


The answer to the ductile nickel.. Just a slight wording that would make u loose the mark.. They are ions.. Not atoms :smile:

Posted from TSR Mobile
Original post by TLHroolz
You needed to work out the Phosphoric acid not the nitric acid.

Posted from TSR Mobile


Ok thank you! I swear it was the molarity of the nitric acid we had to work out...? Well I probably misread it, but thanks for your help!
Reply 19
Avatar for _Caz_
_Caz_
OP
10
Original post by Acermase
The answer to the ductile nickel.. Just a slight wording that would make u loose the mark.. They are ions.. Not atoms :smile:

Posted from TSR Mobile


I think they allow both but I've changed it anyway :smile: Thanks

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