Edexcel chemistry 1 Watch

obviouslystudying
Badges: 1
Rep:
?
#261
Report 8 years ago
#261
(Original post by thething135)
im pretty sure its 5:1 cuz it says 4 grams of helium to 4 grams of neon
and helium's atomic mass is 5 times smaller than neon therefore 5 time more atoms?
Oh no. I think i must have thought of hydrogen and assumed He forms a diatomic moleclue. i got ration 2.5:1
0
reply
Itachi8
Badges: 0
Rep:
?
#262
Report 8 years ago
#262
for the risk question is one of them that test tube might fell down
0
reply
ACatCalledMeow
Badges: 1
Rep:
?
#263
Report 8 years ago
#263
(Original post by LittleMuffin)
if you talked about asymmetry, i think you can still get the marks, but you have to talk about how the Br can bond to the second or third carbon, making a major and minor product
Is it correct if i say it's because "it's the reaction between an unsymmetrical reactant and an unsymmetrical reagent. So, the reaction will produce two carbocation. One being the primary carbocation and another being the secondary carbocation. The secondary carbocation will be the major product as it is more stable than the primary carbocation"?

:confused:
0
reply
Epic_Fail
Badges: 0
Rep:
?
#264
Report 8 years ago
#264
(Original post by Itachi8)
for the risk question is one of them that test tube might fell down
i hope thats an answer because that's what i wrote lool it sounds so stupid to me though
0
reply
Sade67
Badges: 0
Rep:
?
#265
Report 8 years ago
#265
There was not a question on geometric isomerism. It was about the major and minor products off electophillic addition of HBr with propene.
0
reply
obviouslystudying
Badges: 1
Rep:
?
#266
Report 8 years ago
#266
(Original post by Aerox217)
I probably read the question wrong (AGAIN) but I wrote ^THIS. Two potential places for Br to join hope we're right.
Whew. Finally found someone with similar answers on a disputive question, and hopefully we ARE right.
0
reply
obviouslystudying
Badges: 1
Rep:
?
#267
Report 8 years ago
#267
(Original post by Itachi8)
for the risk question is one of them that test tube might fell down
Isnt the test tube clamped? and i thought the loose bung was for illustrative purposes.
0
reply
Itachi8
Badges: 0
Rep:
?
#268
Report 8 years ago
#268
(Original post by obviouslystudying)
Isnt the test tube clamped? and i thought the loose bung was for illustrative purposes.
it didn't show on the diagram or did it
0
reply
Stratos
Badges: 13
Rep:
?
#269
Report 8 years ago
#269
(Original post by obviouslystudying)
Oh no. I think i must have thought of hydrogen and assumed He forms a diatomic moleclue. i got ration 2.5:1
Being diatomic or not has nothing to do with the gmol^-1 sadly we just take it as 1 mol if there is no number left to it so it would be 4/molar mass of helium compared to hydrogen and multiply the 4xthe ratio.
0
reply
jink
Badges: 0
Rep:
?
#270
Report 8 years ago
#270
(Original post by Itachi8)
it didn't show on the diagram or did it
I remember it saying it was clamped.

Anyway, it was pretty good for me, thankfully. I may have lost a few marks, but let's hope for low grade boundaries.
0
reply
obviouslystudying
Badges: 1
Rep:
?
#271
Report 8 years ago
#271
(Original post by ACatCalledMeow)
Is it correct if i say it's because "it's the reaction between an unsymmetrical reactant and an unsymmetrical reagent. So, the reaction will produce two carbocation. One being the primary carbocation and another being the secondary carbocation. The secondary carbocation will be the major product as it is more stable than the primary carbocation"?
:
makes sense to me, but you never know the marking scheme. You maybe missing a silly thing word or something like not referring to the reactants given directly and may lose all.
0
reply
Stratos
Badges: 13
Rep:
?
#272
Report 8 years ago
#272
(Original post by Itachi8)
it didn't show on the diagram or did it
they did refer to it being clamped at the edge however i took that as a danger and said it could be knocked away seeing how it was loosely clamped on the edge around the opening of the test tube.
0
reply
LittleMuffin
Badges: 0
#273
Report 8 years ago
#273
(Original post by ACatCalledMeow)
Is it correct if i say it's because "it's the reaction between an unsymmetrical reactant and an unsymmetrical reagent. So, the reaction will produce two carbocation. One being the primary carbocation and another being the secondary carbocation. The secondary carbocation will be the major product as it is more stable than the primary carbocation"?

:confused:
not so sure about the terminology, but it seems logical. Lets hope the mark scheme is lenient!
0
reply
obviouslystudying
Badges: 1
Rep:
?
#274
Report 8 years ago
#274
(Original post by jink)
I remember it saying it was clamped.

Anyway, it was pretty good for me, thankfully. I may have lost a few marks, but let's hope for low grade boundaries.
Hey, anyway of knowing the lowest marks to achieve full marks in the results sheet? (even for the past exams)
0
reply
jink
Badges: 0
Rep:
?
#275
Report 8 years ago
#275
(Original post by obviouslystudying)
Hey, anyway of knowing the lowest marks to achieve full marks in the results sheet? (even for the past exams)
No, sorry, I've been wondering about that too. I just assumed that it'd be close to the raw mark value you get if you extrapolate the grade A boundary.
0
reply
obviouslystudying
Badges: 1
Rep:
?
#276
Report 8 years ago
#276
(Original post by Stratos)
they did refer to it being clamped at the edge however i took that as a danger and said it could be knocked away seeing how it was loosely clamped on the edge around the opening of the test tube.
didnt see the 'loosely' clamped part, but i think that if it was clamped further back, the bunsen burner would heat the clamp (probably metal) and it would expand, making the test-tube loose. Lets hope the examiners dont see it this way.
0
reply
shadow12345
Badges: 3
Rep:
?
#277
Report 8 years ago
#277
please upload the paper much thanksooooo
0
reply
obviouslystudying
Badges: 1
Rep:
?
#278
Report 8 years ago
#278
(Original post by jink)
No, sorry, I've been wondering about that too. I just assumed that it'd be close to the raw mark value you get if you extrapolate the grade A boundary.
Yeah, but some people here seem to know the way and is able to tell.
0
reply
FallenPetal
Badges: 15
Rep:
?
#279
Report 8 years ago
#279
Did anyone get the very last question???? I really sodding hate the enviroment ones; it's not real science, it's fruity nonsense! >
0
reply
obviouslystudying
Badges: 1
Rep:
?
#280
Report 8 years ago
#280
(Original post by FallenPetal)
Did anyone get the very last question???? I really sodding hate the enviroment ones; it's not real science, it's fruity nonsense! >
Thats where you can use common sense to get some easy marks.
0
reply
X

Quick Reply

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 East Anglia
    All Departments Open 13:00-17:00. Find out more about our diverse range of subject areas and career progression in the Arts & Humanities, Social Sciences, Medicine & Health Sciences, and the Sciences. Postgraduate
    Wed, 30 Jan '19
  • Solent University
    Careers in maritime Undergraduate
    Sat, 2 Feb '19
  • Sheffield Hallam University
    City and Collegiate Campus Undergraduate
    Sun, 3 Feb '19

Brexit: Given the chance now, would you vote leave or remain?

Remain (665)
80.7%
Leave (159)
19.3%

Watched Threads

View All