Edexcel A2 Chemistry Exams -6CH04 (14th June) and 6CH05 (22nd June) Discussion Thread Watch

Protoxylic
Badges: 14
Rep:
?
#1641
Report 2 years ago
#1641
(Original post by samb1234)
I don't think you want to tbh if it's from where I think it is
You're tempting me to research this, brb.
1
quote
reply
Neha121101
Badges: 1
Rep:
?
#1642
Report 2 years ago
#1642
Name:  Screen Shot 2016-06-19 at 14.58.40.png
Views: 128
Size:  60.5 KB

hiya, could someone explain why the answer is A please? Quite confused
thanks
0
quote
reply
imnoteinstein
Badges: 2
Rep:
?
#1643
Report 2 years ago
#1643
I often get confused on questions where they tell us to find which option isnt a redox equation, like I know you figure out the oxidation numbers etc but for ex Q2 here, could someone please explain how they would come to the conclusion that its d? i thought it was B at first
https://a5c076379da85d2c0b501a60f1a4...0Chemistry.pdf
0
quote
reply
C0balt
Badges: 14
Rep:
?
#1644
Report 2 years ago
#1644
(Original post by Neha121101)
Name:  Screen Shot 2016-06-19 at 14.58.40.png
Views: 128
Size:  60.5 KB

hiya, could someone explain why the answer is A please? Quite confused
thanks
CO2 in solution forms carbonic acid
0
quote
reply
Neha121101
Badges: 1
Rep:
?
#1645
Report 2 years ago
#1645
(Original post by C0balt)
CO2 in solution forms carbonic acid
oh ofc, thanks!
0
quote
reply
C0balt
Badges: 14
Rep:
?
#1646
Report 2 years ago
#1646
(Original post by Neha121101)
oh ofc, thanks!
0
quote
reply
alexfrances
Badges: 1
Rep:
?
#1647
Report 2 years ago
#1647
am i the only that actually enjoys unit 5 much more than unit 4? the maths is easier and the organic stuff you either know it or you don't it doesn't really try and trick you out. (maybe that's just me lol)
0
quote
reply
Supermanxxxxxx
Badges: 5
Rep:
?
#1648
Report 2 years ago
#1648
Name:  ImageUploadedByStudent Room1466349308.460007.jpg
Views: 140
Size:  144.5 KB
I don't get 12 as the answer is b but surely London forces cant be stronger then hydrogen bonds


Posted from TSR Mobile
0
quote
reply
setarcos
Badges: 8
Rep:
?
#1649
Report 2 years ago
#1649
(Original post by alexfrances)
am i the only that actually enjoys unit 5 much more than unit 4? the maths is easier and the organic stuff you either know it or you don't it doesn't really try and trick you out. (maybe that's just me lol)
Yeah, probs just u lol
0
quote
reply
Supermanxxxxxx
Badges: 5
Rep:
?
#1650
Report 2 years ago
#1650
(Original post by setarcos)
Yeah, probs just u lol
Lol unit 5 is horrible


Posted from TSR Mobile
0
quote
reply
alexfrances
Badges: 1
Rep:
?
#1651
Report 2 years ago
#1651
(Original post by Supermanxxxxxx)
Name:  ImageUploadedByStudent Room1466349308.460007.jpg
Views: 140
Size:  144.5 KB
I don't get 12 as the answer is b but surely London forces cant be stronger then hydrogen bonds


Posted from TSR Mobile
benzene has such a large number of electrons compared to ethanol that the london forces in this case are stronger than the hydrogen bonds of the ethanol. (that's the extent of my knowledge tbh)
0
quote
reply
samb1234
Badges: 13
Rep:
?
#1652
Report Thread starter 2 years ago
#1652
(Original post by Supermanxxxxxx)
Name:  ImageUploadedByStudent Room1466349308.460007.jpg
Views: 140
Size:  144.5 KB
I don't get 12 as the answer is b but surely London forces cant be stronger then hydrogen bonds


Posted from TSR Mobile
Benzene has 6 electrons that are delocalised and as such can set up stronger temporary dipoles much more easily than most molecules
0
quote
reply
Peppercrunch
Badges: 13
Rep:
?
#1653
Report 2 years ago
#1653

How is this C?
I put B as one mole reacts with 2 moles of AgNO3 so two moles of AgCl should form, so there should be 2 Cl in the complex, or am I missing something completely obvious?
Attached files
0
quote
reply
username1601559
Badges: 3
Rep:
?
#1654
Report 2 years ago
#1654
Is anyone able to help me understand why the answer to 11 is C? Thanks Name:  image.jpg
Views: 88
Size:  499.8 KB
0
quote
reply
username1601559
Badges: 3
Rep:
?
#1655
Report 2 years ago
#1655
(Original post by Peppercrunch)

How is this C?
I put B as one mole reacts with 2 moles of AgNO3 so two moles of AgCl should form, so there should be 2 Cl in the complex, or am I missing something completely obvious?
Oops didn't realise you just asked about the same question!
0
quote
reply
Neha121101
Badges: 1
Rep:
?
#1656
Report 2 years ago
#1656
(Original post by Peppercrunch)

How is this C?
I put B as one mole reacts with 2 moles of AgNO3 so two moles of AgCl should form, so there should be 2 Cl in the complex, or am I missing something completely obvious?
Theres 3Cl in the compound (crystals)
only the free Cl- ions OUTSIDE the complex react with AgNO3
so you're right in that 2 moles of AgCl form
therefore there must be only 1 Cl in the complex
I don't know if that makes sense lol but I hope that helps
2
quote
reply
Peppercrunch
Badges: 13
Rep:
?
#1657
Report 2 years ago
#1657
(Original post by PythagorasRex)
Oops didn't realise you just asked about the same question!
Haha, doing the same past paper. It really annoyed me as there was a question with bad wording.

(Original post by Neha121101)
Theres 3Cl in the compound (crystals)
only the free Cl- ions OUTSIDE the complex react with AgNO3
so you're right in that 2 moles of AgCl form
therefore there must be only 1 Cl in the complex
I don't know if that makes sense lol but I hope that helps
Ah, thank you. It did make sense to me. It is a bit hard to explain.
0
quote
reply
username1601559
Badges: 3
Rep:
?
#1658
Report 2 years ago
#1658
Name:  image.jpeg
Views: 76
Size:  20.6 KBDoes anyone know why the enthalpy of cyclohexane is lower than the enthalpies of X (cyclohex1ene) and benzene? I get that benzene is more stable than X because of its delocalised ring of electrons hence it has a lower enthalpy, but why does it have a lower enthalpy than cyclohexane?
0
quote
reply
Peppercrunch
Badges: 13
Rep:
?
#1659
Report 2 years ago
#1659
(Original post by PythagorasRex)
Name:  image.jpeg
Views: 76
Size:  20.6 KBDoes anyone know why the enthalpy of cyclohexane is lower than the enthalpies of X (cyclohex1ene) and benzene? I get that benzene is more stable than X because of its delocalised ring of electrons hence it has a lower enthalpy, but why does it have a lower enthalpy than cyclohexane?
Structure X in that question isn't cyclohex-1-ene. It's the kekule structure if you read again carefully. The kekule structure has 3 C=C bonds so has a higher enthalpy than cyclohexane.

Benzene has a higher enthalpy than cyclohexane as shown in that diagram.
0
quote
reply
lordoftheties
Badges: 12
Rep:
?
#1660
Report 2 years ago
#1660
How do you know which separation technique is needed for organic synthesis questions? I know there's Simple Distillation, Steam Distillation, Solvent Extraction and Recrystallisation...
0
quote
reply
X

Reply to thread

Attached files
Write a reply...
Reply
new posts
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

University open days

  • University of Lincoln
    Brayford Campus Undergraduate
    Wed, 12 Dec '18
  • Bournemouth University
    Midwifery Open Day at Portsmouth Campus Undergraduate
    Wed, 12 Dec '18
  • Buckinghamshire New University
    All undergraduate Undergraduate
    Wed, 12 Dec '18

Do you like exams?

Yes (151)
18.04%
No (510)
60.93%
Not really bothered about them (176)
21.03%

Watched Threads

View All
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise