HOW WAS CHEMISTRY PRACTICAL?

[BlackVelvet]

For those who take chem practical:

1. How did it go?
2. How accurate were the guesses?

Hope yours went great!

 

[ashhadazam]

Guesses were good about the salt but there were some changes regarding FB10 and 11..
Practical went good

 

[BlackVelvet]

how was the enthalpy value? and is it true that gradient is supposed to be negative?

 

[ashhadazam]

no the gradient was posituve !!! i got 25.6 as my enthalpy value ! urs ?

 

[BlackVelvet]

mine was 67.3KJmol-1

im getting a heart attack here!

how much marks do you think im losing for the wrong enthalpy value??

 

[BlackVelvet]

Hey anymore response?

 

[ashhadazam]

I dnt know.. One of my friend also getting 60.. But the other got around 27 :S !!

 

[faem]

My one was 54 and gradiant was 2 my points went straight through the origin
Practical as a whole was not bad.

 

[BlackVelvet]

yes mine too went straight through the origin but gradient was not 2
what about the solutions with alcohol?

 

[worldmaster786]

my gradient was 2.22
and enthalpy was 67.6 KJ/mol

 

[BlackVelvet]

well I think it all depends to our teacher's experiment then....

by the way whats the solution contains alcohol? FB10&FB11 or FB9&FB12 ??

 

[vux]

same. my gradient was around 2.12,
enthalpy ard 65KJ/mol
and temp change ard 150 degrees celcius

the guesses were pretty correct. especially about the glucose and butanone having to differentiate ketone and aldehyde
and NO2SO4 was a planted fake.

 

[BlackVelvet]

sooo? what is the solutions containing alcohol?? I answered FB9&FB12

 

[Agha]

alcohols were in FB9 and FB10...,
and my gradient was 2.4..,

 

[sk8rdude]

alcohols were in FB9 and FB10...,
and my gradient was 2.4..,

dude... the alcohols were in FB-10 and FB-11.... FB-9 was a Ketone and FB-12 was an Aldehyde..

 

[princesszahra]

full marks inshallah!

 

[mzzzz]

thr was something wrong with my solids
so i was getting a trend fr fb1 fb2 n fb3
but fr fb5 n fb6 it wasnt on the trend
how many marks i will lose coz of tht

 

[Agha]

alcohols were in FB9 and FB10...,
and my gradient was 2.4..,

dude... the alcohols were in FB-10 and FB-11.... FB-9 was a Ketone and FB-12 was an Aldehyde..

yeah it was in fb10 and fb 11.. i have done it right i just miss wrote it here...,

 

[BlackVelvet]

@sk8rdude:

Isn't FB9 is becoming ketone after it is acidified with potassium dichromate? I mean it means it is alcohol before the oxidation reaction happens right?
And so is FB 10. It is alcohol before oxidized. That's why we need to identify the presence of ketone or aldehyde using 2, 4 DNPH

 

[BlackVelvet]

right?? someone please confirm this