GCSE OCR 21st Century B7 C7 P7 - W/C - Monday 20th June 2016 Watch

11207ymir
Badges: 5
Rep:
?
#201
Report 3 years ago
#201
yh same it was amazing! for calculating atom economy did you get 4/36*100 = 11.1111%
0
reply
11207ymir
Badges: 5
Rep:
?
#202
Report 3 years ago
#202
(Original post by MezmorisedPotato)
Wonderful paper, apart from a few stupid mistakes (in a six marker but only a few marks), everything else was shockingly pleasant!
we should make an unofficial markscheme
0
reply
11207ymir
Badges: 5
Rep:
?
#203
Report 3 years ago
#203
(Original post by 11207ymir)
we should make an unofficial markscheme
for energy calculations did people get 587-1134= -547
1
reply
isabelaskey
Badges: 5
Rep:
?
#204
Report 3 years ago
#204
I thought it went terribly, there was hardly anything on organic chemistry and equilibrium (my favourite)
It felt like it was mostly chromatography
1
reply
bonnie_x
Badges: 12
Rep:
?
#205
Report 3 years ago
#205
(Original post by 11207ymir)
yh same it was amazing! for calculating atom economy did you get 4/36*100 = 11.1111%
Yup I got that!
0
reply
amber2212
Badges: 6
Rep:
?
#206
Report 3 years ago
#206
i didn't do much on chromatography as it came up last year, but i thought the paper was alright not amazing, not awful!!
0
reply
Protostar
Badges: 21
Rep:
?
#207
Report 3 years ago
#207
(Original post by 11207ymir)
for energy calculations did people get 587-1134= -547
Oh no I think I got 547 - 1134 = -587
0
reply
Protostar
Badges: 21
Rep:
?
#208
Report 3 years ago
#208
(Original post by 11207ymir)
yh same it was amazing! for calculating atom economy did you get 4/36*100 = 11.1111%
Yeah I got that one
0
reply
Protostar
Badges: 21
Rep:
?
#209
Report 3 years ago
#209
For the last 6 marker (about the acids) how many marks would I get for being right about the pHs but completely wrong about concentrations? Hopefully I won't be limited to L1 lmao
0
reply
reu_taylor
Badges: 8
Rep:
?
#210
Report 3 years ago
#210
Was definitely 20% you spenghoulis
0
reply
11207ymir
Badges: 5
Rep:
?
#211
Report 3 years ago
#211
(Original post by NiamhM1801)
For the last 6 marker (about the acids) how many marks would I get for being right about the pHs but completely wrong about concentrations? Hopefully I won't be limited to L1 lmao
probably about 2/3
for that question i talked about the strong acids having the low ph and high concentration if the volume of sodium hydroxide was low as less is needed to neutralise the acid which makes it more concentrated, i think it was acid f that was most strongest and had the highest concentration
0
reply
Mr_Elmo
Badges: 5
Rep:
?
#212
Report 3 years ago
#212
(Original post by 11207ymir)
probably about 2/3
for that question i talked about the strong acids having the low ph and high concentration if the volume of sodium hydroxide was low as less is needed to neutralise the acid which makes it more concentrated, i think it was acid f that was most strongest and had the highest concentration
Surely a low amount of sodium hydroxide would mean a lower concentration as you need less alkali overall?
0
reply
11207ymir
Badges: 5
Rep:
?
#213
Report 3 years ago
#213
(Original post by reu_taylor)
Was definitely 20% you spenghoulis
no it wasnt there were 4 hydrogens in the product and the total mass of reactants was 36 atom economy= mass of hydrogens in products/total mass of all reactants*100
0
reply
Protostar
Badges: 21
Rep:
?
#214
Report 3 years ago
#214
(Original post by 11207ymir)
probably about 2/3
for that question i talked about the strong acids having the low ph and high concentration if the volume of sodium hydroxide was low as less is needed to neutralise the acid which makes it more concentrated, i think it was acid f that was most strongest and had the highest concentration
Ok that's not too bad then to say I had no idea about concentration
I just assumed that the higher the number in the second column, the higher the concentration of the acid as more alkali is needed to neutralise it, however my friend said that I read that column wrong as she thought it said amount of acid needed to neutralise the alkali whereas I thought it was amount of alkali needed to neutralise the acid. Hey ho
0
reply
reu_taylor
Badges: 8
Rep:
?
#215
Report 3 years ago
#215
(Original post by 11207ymir)
no it wasnt there were 4 hydrogens in the product and the total mass of reactants was 36 atom economy= mass of hydrogens in products/total mass of all reactants*100
Exactly, it was 4/20 NOT 36 therefore it was 20%
0
reply
11207ymir
Badges: 5
Rep:
?
#216
Report 3 years ago
#216
(Original post by reu_taylor)
Exactly, it was 4/20 NOT 36 therefore it was 20%
well no one else got it
anyway you will prob get 1mark
0
reply
Mr_Elmo
Badges: 5
Rep:
?
#217
Report 3 years ago
#217
(Original post by reu_taylor)
Exactly, it was 4/20 NOT 36 therefore it was 20%
Wrong, i did the same thing but what i forgot to realise is that there are 2 oxygens so (2x16) + 4 = 36
0
reply
reu_taylor
Badges: 8
Rep:
?
#218
Report 3 years ago
#218
(Original post by Mr_Elmo)
Wrong, i did the same thing but what i forgot to realise is that there are 2 oxygens so (2x16) + 4 = 36
Was there actually? I checked it and I don't think there was
0
reply
Mr_Elmo
Badges: 5
Rep:
?
#219
Report 3 years ago
#219
(Original post by reu_taylor)
Was there actually? I checked it and I don't think there was
There was a 2 at the front of the reaction i think so yeah
0
reply
reu_taylor
Badges: 8
Rep:
?
#220
Report 3 years ago
#220
(Original post by Mr_Elmo)
There was a 2 at the front of the reaction i think so yeah
Fair enough if it was, but why would the atom economy go down if it was supposedly a "new" method?
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts

All the exam results help you need

906

people online now

225,530

students helped last year
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 Aberdeen
    General Open Day Undergraduate
    Tue, 27 Aug '19
  • Norwich University of the Arts
    Postgraduate (MA) Open Day Postgraduate
    Sat, 31 Aug '19
  • University of Lincoln
    Guardian Offices, Kings Cross, London Postgraduate
    Mon, 2 Sep '19

How are you feeling about GCSE Results Day?

Hopeful (220)
12.48%
Excited (165)
9.36%
Worried (308)
17.47%
Terrified (389)
22.06%
Meh (182)
10.32%
Confused (38)
2.16%
Putting on a brave face (244)
13.84%
Impatient (217)
12.31%

Watched Threads

View All