its acid where is the other O??
-
We need your support!
We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
Click here to Donate Now (View Announcement)
GT for Chemistry paper 22 AS.
- Thread starter manfp
- Start date
- Messages
- 729
- Reaction score
- 477
- Points
- 73
CHO?? yeah min too .I got CHO as the empirical formula and suspect that it is wrong!
What was the empirical formula?
In Q5 what functional group was present in G?
And what was the enthalpy change?Mine was -129 kJ/mol.
Shit guys! for the enthalpy question i got -129
And for the second part where we had to explain the factors temp, pressure and catalyst, I wrote everything according to the main equation, which was combustion of methanol!
Like for example in temperature, I wrote : Since the equation is exothermic, increasing the temperature will lower the yield cuz it will shift backwards and decreasing the temperature will increse the yield cuz it will shift forward.
Am I correct?
And for the second part where we had to explain the factors temp, pressure and catalyst, I wrote everything according to the main equation, which was combustion of methanol!
Like for example in temperature, I wrote : Since the equation is exothermic, increasing the temperature will lower the yield cuz it will shift backwards and decreasing the temperature will increse the yield cuz it will shift forward.
Am I correct?
- Messages
- 16
- Reaction score
- 93
- Points
- 23
Yes increasing the temp would lower the equilibrium yeild as the forward reaction was exothermic
Dat reaction ws not an equilibrium one
- Messages
- 231
- Reaction score
- 65
- Points
- 38
Yeah @Bullytro the reaction wasnt an equilibirium one so u just had to mention the collision theory part but dont worry u will get a mark for each part if u wrote that they increase the rate of fomation.....
- Messages
- 971
- Reaction score
- 532
- Points
- 103
I don't understand why people think it is an equilibrium reaction when there was no equilibrium sign, no mention of equilibrium and it was clearly written in bold 'rate of formation', which means this should all be reaction kinetics stuff.
Wheres the OH?
Enthalpy Change was= -129 KJ/mol
The structure for question 5 was = OHCH2COCH2OH, By just getting this right, obviously the whole question will be alright.
First question= Colored flame produced was with Na, P and S
The smaller angle was of sulfurs
The structure for question 5 was = OHCH2COCH2OH, By just getting this right, obviously the whole question will be alright.
First question= Colored flame produced was with Na, P and S
The smaller angle was of sulfurs
- Messages
- 7
- Reaction score
- 0
- Points
- 1
guys i think this paper was way too easy and gt will be high as hell this year cause we all had plenty of time to revise and stuff
and i wana know i drew the structures in the paper using pencil is that fine
and i wana know i drew the structures in the paper using pencil is that fine
- Messages
- 7
- Reaction score
- 0
- Points
- 1
ture that
and btw the gt will be around 45 cause even though the paper was short and I found it relatively easy as compared to the May/June 11 papers, there are some blunders everyone made. Like most of you got the pressure, temperature and catalyst wrong. Empirical formula seems to differ from here and there.
P22
stuffs i remember!
q1: phosphorus has coloured flame!
observations wer white solid formed and color of chlorine disappears.
all the three were acidic(pH na: 3, and others i dont remember) and i did all of them react(which i know is wrong)
reaction with water, neutralisation?
angle a was smaller bcause it had 2 lone pairs
q2: enthalpy i think i did a silly mistake and i THINK i got -127
reaction kinetics for all the three!
q3: 2 esters were formed
one alkene
one alcohol
and one carboxylic acid
dehydration, oxidation, hydrolysis/hydration
chiral one was easy
cis trans skeletal was easy
q4: 2 ticks for alcohol for oxidising agent (i dnt rem what was it) and Na
1 tick for Nahco3 and ester
1 tick for Carboxylic acid and Na
1 tick for aldehyde and oxidising agent
functional grp was alcohol
no. of moles of hydrogen= 0.05 (LOL i m pretty sure im wrong, i just didnt want to leave the space empty so did some shit and got 0.05)
then it was ketone which doesnt react with fehlings but with 24 DNPH
and there were 2 alcohols and one ketone, so i got C3H6O3
and the last with oxiding agent the primary alc turn into carboxylic acids
the ketone tunrs into sec alcohol with the reducing agent
THATS IT i cant rem 2 or 3 parts in there!
point me out if im wrong or if i left something!
God Bless You All!
stuffs i remember!
q1: phosphorus has coloured flame!
observations wer white solid formed and color of chlorine disappears.
all the three were acidic(pH na: 3, and others i dont remember) and i did all of them react(which i know is wrong
) reaction with water, neutralisation?
angle a was smaller bcause it had 2 lone pairs
q2: enthalpy i think i did a silly mistake and i THINK i got -127
reaction kinetics for all the three!
q3: 2 esters were formed
one alkene
one alcohol
and one carboxylic acid
dehydration, oxidation, hydrolysis/hydration
chiral one was easy
cis trans skeletal was easy
q4: 2 ticks for alcohol for oxidising agent (i dnt rem what was it) and Na
1 tick for Nahco3 and ester
1 tick for Carboxylic acid and Na
1 tick for aldehyde and oxidising agent
functional grp was alcohol
no. of moles of hydrogen= 0.05 (LOL i m pretty sure im wrong, i just didnt want to leave the space empty so did some shit and got 0.05)
then it was ketone which doesnt react with fehlings but with 24 DNPH
and there were 2 alcohols and one ketone, so i got C3H6O3
and the last with oxiding agent the primary alc turn into carboxylic acids
the ketone tunrs into sec alcohol with the reducing agent
THATS IT i cant rem 2 or 3 parts in there!
point me out if im wrong or if i left something!
God Bless You All!
- Messages
- 249
- Reaction score
- 90
- Points
- 38
evn i thought tat too..bt realized it ltr!!!
- Messages
- 249
- Reaction score
- 90
- Points
- 38
u actualy rmbr wt u wrote!!P22
stuffs i remember!
q1: phosphorus has coloured flame!
observations wer white solid formed and color of chlorine disappears.
all the three were acidic(pH na: 3, and others i dont remember) and i did all of them react(which i know is wrong
reaction with water, neutralisation?
angle a was smaller bcause it had 2 lone pairs
q2: enthalpy i think i did a silly mistake and i THINK i got -127
reaction kinetics for all the three!
q3: 2 esters were formed
one alkene
one alcohol
and one carboxylic acid
dehydration, oxidation, hydrolysis/hydration
chiral one was easy
cis trans skeletal was easy
q4: 2 ticks for alcohol for oxidising agent (i dnt rem what was it) and Na
1 tick for Nahco3 and ester
1 tick for Carboxylic acid and Na
1 tick for aldehyde and oxidising agent
functional grp was alcohol
no. of moles of hydrogen= 0.05 (LOL i m pretty sure im wrong, i just didnt want to leave the space empty so did some shit and got 0.05)
then it was ketone which doesnt react with fehlings but with 24 DNPH
and there were 2 alcohols and one ketone, so i got C3H6O3
and the last with oxiding agent the primary alc turn into carboxylic acids
the ketone tunrs into sec alcohol with the reducing agent
THATS IT i cant rem 2 or 3 parts in there!
point me out if im wrong or if i left something!
God Bless You All!
Lol yes this is the only paper i remember what ever i wrote because my chem practical sucked and so i had to do this very well. so i checked it like so many times
but you see i still got -127
pffth