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sweet777

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Chem help!

« 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 Huh?

5 => C ?
12 => B ?
13 => B ?

please help!!

THANK YOU!!


« Last Edit: November 20, 2009, 05:40:55 AM by sweet777 »	Logged

sweet777

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Re: Chem help!

« Reply #1 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? Huh?

PLEASE HELP..I HAVE CHEM EXAM TMZ!!!!!!


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Re: Chem help!

« Reply #2 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 Huh?

5 => C ?
12 => B ?
13 => B ?

please help!!

THANK YOU!!


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Re: Chem help!

« Reply #3 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


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