HOW WAS CHEMISTY PRACTICAL?

[hamizahmed]

well anamaly, I also got the same value, but will anyone explain me, what had to be done in the calculation part in which specific heat capacity of the beaker had to be added to the energy. I just couldnot understand how the sph can directly be added to our energy value?

 

[Shafaque]

Value of enthalpy changes etc depends upon supervisor readings...!
i was getting percentage difference of 13.4
and my molar enthalpy change was 17.2 kj!
i performed Q1 twice!!..it was so confusing

my salt analysis went good!...
i finished paper on time!..although i did 1st question twice

i did alot of cuttings! and crossing out answers...i hope it doesnt affect my grade :|

 

[Aamir Khan]

judging from the answers that i have heard so far..a lot of people messed up so you should be safe on percentile

 

[arhama]

is there a percentile anymore though? dont think so......although yes the overall cumulative threshold is bound to be low judging by the discussion on here. any ideas at what mark is the A going to settle? my question 2 went smooth. the problem was one and its calculations...screwed that up:-(
and yes it was a freaking lengthy paper. For 1b it was like they gave another question. sheeeesh.

 

[Shafaque]

Most of the ppl left the calculations of Q1..!

 

[arhama]

dude that was soo stupid though seriously.....a page long calculation for 1 mark.........WOW..hats off to the genius paper maker.

 

[hamizahmed]

will anyone give answer to my query???

 

[Anomaly]

well anamaly, I also got the same value, but will anyone explain me, what had to be done in the calculation part in which specific heat capacity of the beaker had to be added to the energy. I just couldnot understand how the sph can directly be added to our energy value?

You had to multiply your value of the specific heat of the beaker to the temperature fall for the reaction of Nh4Cl and Water, this gives you the amount of heat absorbed by the beaker (the amount which shouldve been absorbed by the solution but wasnt). I had a sph around 10

 

[Sabrina]

i did good in Q2 n had no problem in managing time.. i actually did 30 minutes before in Q1 i am not sure... over all i am satisfied with my paper...

30 minutes before? Wow youre quick, i spent about 70 minutes on the first question, so had less time for q2, had to do the 7 mark table in about 20 minutes. What was the value of the specific heat of the Beaker?

well i guess i am.. n i dont remember my value of the heat capacity.

 

[Sabrina]

i did good in Q2 n had no problem in managing time.. i actually did 30 minutes before in Q1 i am not sure... over all i am satisfied with my paper...

30 minutes before? Wow youre quick, i spent about 70 minutes on the first question, so had less time for q2, had to do the 7 mark table in about 20 minutes. What was the value of the specific heat of the Beaker?

shes over efficient..=P... isn't it sabrina??..=P

no i am not ghania..

 

[Babuzar]

hey did anyone get a molar enthalpy change greater than 15.2 in p33

i got enthalpy change of 14.9Kj.....only 3% diffrence....

 

[hashaam.saqib]

my enthlapy change was 14.8...! quite accurate....!!!

 

[cool]

i got molar enthalpy of 0.147 kj per mol... well this i think is absolutely wrong because the precentage difference went up to 99 percent.. i don't know where i had problem in calculation....was the heat capacity of beaker around 0.6 ??

 

[Babuzar]

i got molar enthalpy of 0.147 kj per mol... well this i think is absolutely wrong because the precentage difference went up to 99 percent.. i don't know where i had problem in calculation....was the heat capacity of beaker around 0.6 ??

my friends had a enthalpy change of 3745% i think....so dodnt worry!

 

[princesszahra]

i got enthaplu chage as 138 kjmol^-1
and %error as 3%
so i think its right!

 

[Anomaly]

i got molar enthalpy of 0.147 kj per mol... well this i think is absolutely wrong because the precentage difference went up to 99 percent.. i don't know where i had problem in calculation....was the heat capacity of beaker around 0.6 ??

0.6 is too low, i think i got around 9.86 or something (which i think is also low)

 

[fullmetallegend]

in paper 33 i got 23% difference
the cation ion s were copper mangnese and barium

 

[Babuzar]

in paper 33 i got 23% difference
the cation ion s were copper mangnese and barium

i think it was NH+, i even heated one with NaOH and Ammonia came out....

 

[intel1993]

it was Nh4+ bt not barium.........

 

[Hasnain.Jaffer]

my percentage was coming around 86