A level chemistry paper 1 unofficial markscheme 2018

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67823
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#1
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Born Haber labelling (3 marks)
Lattice formation: -3888 (3 marks)
3x10 Kpa-2
Entropy: 181
Gibbs free: -1063
Abundance: 80% (3 marks)
TOM distance: 1.54 (5 marks
Ph: 13.10 & 4.28
Electrode potential: +0.18 (1 marks)
Ideal gas volume: 133cm (4 marks)
Concentration: 0.0218
Isomerism: E-Z
Bond angle: 104.5

Aluminium question

AlCl3 + 6 H2O --> Al(H2O)6]3+ + 3 Cl-
2[Al(H2O)6]3+ + 3 CO32- —> 2 Al(H2O)3(OH)3 + 3 CO2 + 3 H2O
Observations: white precipitate & effervescence
[Al(H2O)6]3+ + 3 OH- --> Al(H2O)3(OH)3 + 3 H2O
Observation: white precipitate
Al(H2O)3(OH)3 + 3 OH- -->; [Al(OH)6]3- + 3 H2O
Observations: colourless solution

Back titration (7 marks)
X=1

Bonding (6mark)
NaBr
giant ionic structure
Strong Ionic bond(electrostatic force) between ions
So high melting point
Na
Giand metallic structure
Metallic bonding between delocalized electrons and Na+ ions
But weaker than ionic bond between Na+ and Br-
So lower melting point
NaI
Giant ionic structure
But I- larger so lower charge density
More sheilding
So ionic bong between Na+ and I- is weaker
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Admixtus
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#2
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It is not optical isomerism.
[V(H2O)4Cl2)]+ is E-Z isomerism
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alevelstruggless
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80% abundance of ion
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Admixtus
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For 6 marks question:
NaBr
giant ionic structure
Strong Ionic bond(electrostatic force) between ions
So high melting point
Na
Giand metallic structure
Metallic bonding between delocalized electrons and Na+ ions
But weaker than ionic bond between Na+ and Br-
So lower melting point

NaI
Giant ionic structure
But I- larger so lower charge density
More sheilding
So ionic bong between Na+ and I- is weaker
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67823
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#5
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(Original post by Admixtus)
It is not optical isomerism.
[V(H2O)4Cl2)]+ is E-Z isomerism
Okay thank you. Will change
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67823
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(Original post by alevelstruggless)
80% abundance of ion
Thank you
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67823
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#7
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(Original post by 67823)
Lattice formation: -3888
3x10 Kpa-2
Entropy: 181
Gibbs free: -1063
Abundance: 80%
TOM distance: 1.54
Ph: 13.10 & 4.28
Electrode potential: +0.18
Ideal gas volume: 133cm
Concentration: 0.0218
Isomerism: E-Z
Bond angle: 104.5

Aluminium question

AlCl3 + 6 H2O --> [Al(H2O)6]3+ + 3 Cl-
2[Al(H2O)6]3+ + 3 CO32- --> 2 Al(H2O)3(OH)3 + 3 CO2 + 3 H2O
Observations: white precipitate & effervescence
[Al(H2O)6]3+ + 3 OH- --> Al(H2O)3(OH)3 + 3 H2O
Observation: white precipitate
Al(H2O)3(OH)3 + 3 OH- --> [Al(OH)6]3- + 3 H2O
Observations: colourless solution

Back titration (7 marks)
X=1

Bonding (6mark)
NaBr
giant ionic structure
Strong Ionic bond(electrostatic force) between ions
So high melting point
Na
Giand metallic structure
Metallic bonding between delocalized electrons and Na+ ions
But weaker than ionic bond between Na+ and Br-
So lower melting point
NaI
Giant ionic structure
But I- larger so lower charge density
More sheilding
So ionic bong between Na+ and I- is weaker
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Harrison67
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#8
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I got 85
(88*85)+(87*7.5)+(86*7.5)/1000 = 87.7
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Shuviliaxx
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#9
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which exam board?
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nav.xxx
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#10
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(Original post by Shuviliaxx)
which exam board?
aqa
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