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Qualification => Subject Doubts => IB => Sciences => Topic started by: sweet777 on November 20, 2009, 01:37:43 am

Title: Chem help!
Post by: sweet777 on November 20, 2009, 01:37:43 am
hey....in d chem hl mcq ppr for 2008 may, cn sumone please tell me why the answer to  ???

5 => C ?
12 => B ?
13 => B  ?

please help!!

THANK YOU!! :)
Title: Re: Chem help!
Post by: sweet777 on November 24, 2009, 09:38:03 am
hey..i have another doubt....

if youre given dt 0.982g of sample is dissolved in water to give Fe(NH4)2(SO4)2 . xH2O

and you have to find the number of moles of sulphate, how do u solve it???????


PLEASE HELP..I HAVE CHEM EXAM TMZ!!!!!!
Title: Re: Chem help!
Post by: Ghost Of Highbury on November 24, 2009, 01:26:16 pm
Quote from: sweet777 on November 20, 2009, 01:37:43 am
hey....in d chem hl mcq ppr for 2008 may, cn sumone please tell me why the answer to  ???

5 => C ?
12 => B ?
13 => B  ?

please help!!

THANK YOU!! :)

check this...similar q..


https://studentforums.biz/index.php/topic,4150.msg125049.html#msg125049
Title: Re: Chem help!
Post by: IGSTUDENT on February 08, 2010, 02:31:19 pm
For practical in calculating the enthalpy change of neutralisation in the reaction HCl+NaOH=NaCl+H2O
I drew a graph of temperature of solution vs. volume of acid added in order to find the end point of neutralisation.
Do I have to extrapolate both the ends of the graph to find the true rise or do I record  the highest temperature on the curve of the graph in order to calculate enthalpy change?

Thanks