# Edexcel Chemistry A2 Unit 5 ~ Wednesday 19th June 2013 (Now Closed)Watch

Announcements
Poll: How pumped up are you for this exam?-(warning)-(bad jokes arene this poll!)
"Titanium-I'm not going to corrode (even at high temperatures)" (A*) (22)
16.67%
"Benzene's my middle name, give me the paper in a week and I'll ace it!" (A) (27)
20.45%
"Yeah, I'm fairly electrophillic (positively charged) about the exam" (B) (27)
20.45%
"I'm in the middle of the salt bridge, but I will pass-eventually" (C) (21)
15.91%
13.64%
"Benzene, what's that?" (E) (6)
4.55%
"Chemistry, what's that?" (F) (11)
8.33%
This discussion is closed.
6 years ago
#1901
Is chem 5 a replacement paper or was that only maths for edexcel

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6 years ago
#1902
(Original post by posthumus)
Ah okay I see how it works !

So if I have volume of 32.32313242

uncertainty is 32.000000005 ???
Uncertainty of a burette is +-0.05, so percentage uncertainty with one reading is ( (0.05 x 2) / 32.32414242 ) x100 =0.309 %(3sf)
0
6 years ago
#1903
(Original post by Weaselmoose)
Uncertainty of a burette is +-0.05, so percentage uncertainty with one reading is ( (0.05 x 2) / 32.32414242 ) x100 =0.309 %(3sf)
isnt it 0.005?
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6 years ago
#1904
(Original post by Weaselmoose)
Uncertainty of a burette is +-0.05, so percentage uncertainty with one reading is ( (0.05 x 2) / 32.32414242 ) x100 =0.309 %(3sf)
Oh I made an exagguration here What if there's a burette which gave me such an accurate volume, then wouldn't it's uncertainty be +-00.000000005
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6 years ago
#1905
(Original post by AS01)
isnt it 0.005?
All the burettes I've ever used have been to the nearest 0.1 which means that their uncertainty is +-0.05
0
6 years ago
#1906
(Original post by Weaselmoose)
All the burettes I've ever used have been to the nearest 0.1 which means that their uncertainty is +-0.05
lol yeah just realised that
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6 years ago
#1907
(Original post by posthumus)
Oh I made an exagguration here What if there's a burette which gave me such an accurate volume, then wouldn't it's uncertainty be +-00.000000005
Haha technically yes but it's very unlikely that they'll give you one like that in the exam - calculations might be minute!
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6 years ago
#1908
(Original post by Weaselmoose)
Haha technically yes but it's very unlikely that they'll give you one like that in the exam - calculations might be minute!
I see thanks

I should really stop getting carried away... I need to learn the basics within then next few hours !
0
6 years ago
#1909
Do I need to learn how to name transition metals with oxidation state less than zero?
0
6 years ago
#1910
(Original post by posthumus)
I see thanks

I should really stop getting carried away... I need to learn the basics within then next few hours !
Haha same but my brain feels so frazzled!
0
6 years ago
#1911
Does nitrous acid react with HCl to produce a diazo compound with all amine groups or only those bonded to benzene?
0
6 years ago
#1912
Hope the paper is super duper great in an ideal world

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0
6 years ago
#1913
I feel like I dont know a single thing... :/
0
6 years ago
#1914
(Original post by iwantopas19)
I feel like I dont know a single thing... :/
Go to bed relax the paper in the morn will jigg your memory

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6 years ago
#1915
(Original post by orange94)
Go to bed relax the paper in the morn will jigg your memory

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no time. only 3 hours left..and i still have to learn.. :/ I hate chem.
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6 years ago
#1916
(Original post by iwantopas19)
no time. only 3 hours left..and i still have to learn.. :/ I hate chem.
Same here good luck!
0
6 years ago
#1917
(Original post by posthumus)
Same here good luck!

thank you ! BEST of luck
0
6 years ago
#1918
Hooray pre-exam insomnia -_-

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0
6 years ago
#1919
I can't sleep at all and I have to be up by 4 and a half hours ;_;
Can someone help clear my doubts regarding percentage errors? For example if they said a thermometer to the nearest 0.1, will the accuracy be +\- 0.05?

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0
6 years ago
#1920
(Original post by randyaloul)
I can't sleep at all and I have to be up by 4 and a half hours ;_;
Can someone help clear my doubts regarding percentage errors? For example if they said a thermometer to the nearest 0.1, will the accuracy be +\- 0.05?

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If you would get a result of lets say 14.3 for example accuracy will be 0.5

0.05 is for a burette.... because you could get a reading of 24.94 for example
0
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