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Edexcel IAL Chemistry Unit 3 WCH03 May June 2016 Discussion

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Original post by I <3 WORK
Do you guys remember what was the question about relating to the -OH observation?


It was basically about how to test for the presence of the -OH group
Original post by NNB_Herath
are you sure ???????? :frown:(((


Yup
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Original post by notsoclueless
It was basically about how to test for the presence of the -OH group


And do you remember was this question before or after the haloalkane ( E F G) one ?
Original post by IAROX15
But the x-axis was discrete data. How could that be a line graph?


But a line graph is most suitable as it lets us see the overall trend, yes? It's easier to interpret that way, especially because in the next question, we were asked to give an estimate for some C3H7OH, I think. How could you have gotten an estimate using a bar graph?
Test for OH is universal indicator turning purple/blue
Ugh forgot about K2CO3, wrote K2O instead
Messed up on conversion from G to F
Incomplete combustion is invalid as mass of alcohol burnt is lower so no. of moles of alcohol is lower. Delta H= energy divided by moles so if moles is smaller, Delta H would be higher thus its invalid. The only valid point was heat loss.
Hoping for 45 :/
Original post by I <3 WORK
And do you remember was this question before or after the haloalkane ( E F G) one ?


It was part of the same question.
Like the first part, we had to name E I think.
The next had to do with the test for the -OH group, if my memory serves me right :smile:
The haloalkane one came after this part. Towards the end.
(edited 7 years ago)
Original post by I <3 WORK
And do you remember was this question before or after the haloalkane ( E F G) one ?


it was below the E F G Table
Original post by pondsteps
i wrote cornical granles!!! smthn from bio what the heck lool


Cortical granules? :P Those come in during fertilization of the ovum :P
Original post by notsoclueless
Cortical granules? :P Those come in during fertilization of the ovum :P


ik lol :tongue: i had bio the day before sooo
Original post by dilmaths
Test for OH is universal indicator turning purple/blue
Ugh forgot about K2CO3, wrote K2O instead
Messed up on conversion from G to F
Incomplete combustion is invalid as mass of alcohol burnt is lower so no. of moles of alcohol is lower. Delta H= energy divided by moles so if moles is smaller, Delta H would be higher thus its invalid. The only valid point was heat loss.
Hoping for 45 :/


I wrote K2O as well :P
Original post by notsoclueless
It was basically about how to test for the presence of the -OH group


I wrote add potassium IV dichromate and it would change from orange to green :P
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Original post by pondsteps
ik lol :tongue: i had bio the day before sooo


this made me laugh so much xD
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Original post by pondsteps
ik lol :tongue: i had bio the day before sooo


Unit 3 yeah? How did you find that paper? I loved the fact that Daphnia came :P
Original post by notsoclueless
I wrote K2O as well :P


Ugh maybe we get 1/2 ? Cuz everything was balanced and seemed perfect :frown:
Original post by Hamadtype-
I wrote add potassium IV dichromate and it would change from orange to green :P


Ahhh :P I wrote add phosphorus (v) chloride and misty fumes could be seen :P
Original post by notsoclueless
Unit 3 yeah? How did you find that paper? I loved the fact that Daphnia came :P


yeah i actually found the paper tricky :frown:
Original post by dilmaths
Ugh maybe we get 1/2 ? Cuz everything was balanced and seemed perfect :frown:


I hope so :/
Lets just hope all the other units go well :biggrin:
OH observation is universal indicator turning purple.
Dammit forgot about K2CO3, wrote K2O instead
Incomplete combustion is invalid since this would mean mass of alcohol burnt would be lower thus no. of moles of alcohol would be low. Delta H = Energy divided by moles so lower moles means higher Delta H thus its invalid
Messed up on conversion from G to F
Hoping for around 45 :/
Original post by notsoclueless
I wrote K2O as well :P


arent we supposed to write k2o in the equation... why is it wrong??
Original post by pondsteps
yeah i actually found the paper tricky :frown:


Unit 6 is on Friday. I'm more nervous about that :/ I mean, writing that 10 mark answer needs a lot of thinking and stuff
And I do hope for the second question, they don't introduce some new mathematical concept.

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