confirm salts chem34

[Garret]

oh goddamnit .. how many marks do u think im losing ? grad was abt the same 2.46 and +29kJ

 

[Garret]

but the grad was negative .. - 2.46b which means i plotted the inversed graph ...

 

[ashhadazam]

it was of 3 marks.. I think u wud lose 1.... And ur value is fine as well so u lose only one..
I lose more... I did a stupid mistake.. dint read that we had to do 5 times.. lol ! i lose 2 to 3 marks there... The rest is awesome !

 

[Garret]

thats good to hear ! ... now im off . Big day tomorrow ... phy p4 and math p3 .

 

[ashhadazam]

All the besT !

 

[BlackVelvet]

my gradient was 1.75 and enthalpy about 60kJmol-1 ... damn. and no the gradient isn't supposed to be negative i think.

 

[Xam]

i got gradient -2.64
n mole: 0.28
Energy: 60.smthng......

 

[BlackVelvet]

how come the gradient's negative???

 

[ashhadazam]

gradient would be positive man !! Fall in temperature was increasing as the masss was increasing !

 

[BlackVelvet]

cant be more agree than this

 

[llppgg]

u know wat my teacher said?
most of us for FB10 AND FB11 we wrote turn green..
she said we will b suspected malpractice..coz we didnt
see ut yet we wrote..so worry..sigh...can anyone ask their teacher is tis true?

 

[ashhadazam]

I dunt get u.. !!! I tested them with with dichromate and they did turn green.. Wt malpractice :/

 

[llppgg]

i am nt sure..sigh..coz we didnt get it..yet since is alcohol then we wrote..it wont b malpractice, rite? i am so worry

 

[faem]

Well i had good luck in it. My gradiant was 2 and enthalpy was 54.3kj
WHT TO DO FOR THE PHYSICS AND BIO> bio i can tell u that which cell will come. teacher promised me he would tell me one day before. but someone help me with physics 34 Thanks!

 

[Buffer Solution]

Grad cant be negative. he said bfl should pass through origin. So how come grad be negative. i got ethalpy change 790.......no one even near my value..sigh..

 

[BlackVelvet]

my enthalpy is around 60. and gradient is 1.75. I answered alcohol is in FB 9 and FB 12 because when its being oxidized with potassium dichromate it turned to ketone and aldehyde. so they are alcohols. rite? or am I just being dumb?

 

[obr***]

Guyx the correct gradient is around 2
myn was cmin 2.37
da enthalpy change shud b near 25
lyk 25.6 kJ/mol......
bt i did a silly mistake in ds part

for da salts it was NH4 the common cation
and Fe2+ was the other cation
and SO4 was in FB7

i wrote
FB9 KETONE
FB10 and FB11 ALCOHOL

for da errors it was 0.1/5.6 * 100 for the balance
and 1.0/12 *100 for the temperature

bt i didnt undstand that last part ov Q.1`
i wrote hat the studnts took incorrect measurements of mass or volume!!
ds was jus a blind guex jus to write smthng instead ov nthng---
odawse mja ya part blkl smj nai aya!!!!
ne one who nox the CoRrECT answer plx sHaRE!!

 

[azfar kashif]

I also got the gradient as 2.37! But didn't know, how to find enthalpy change! Got it near 60 something!!!!
But rest is all GREAT, thank GOD!!!

 

[azfar kashif]

In the last part, I wrote SYSTEMATIC error! And i have a confusion! Were we supposed to take the errors as 1.0/12*100 and 0.1/5.6*100 or we should have halved the least graduation????

 

[obr***]

for the part after the gradient one we had to multiply gradient wd 84 ( the Mr of NaHCO3)

and in the last part the one abt the enthalpy change we had to do
Q = m.c.(delta)T
and put 30 in plce ov m
4.3 in place ov c
and ans ov da part before ds part (which was cmin smthng near to 190 deg C) in place of (delta)T
the enthalpy was then cming near 25 kJ/mol

the mstake i did was to becme OVER-EFFICIENT
i took da mass wrong becz ov which my enthalpy is cming wrong