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Author Topic: Edexcel CHEMISTRY DOUBTS!!!!  (Read 253186 times)

Offline The Golden Girl =D

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #840 on: April 03, 2011, 03:25:14 pm »
Quote from: The Secret on April 03, 2011, 10:31:20 am
& my 4th questions is: Do we need to learn the wavenumbers for the different bonds in the different functional groups in IR mass spectroscope?

Based on my teacher you have to know some essential ones in case they're not given ;)
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Offline Vampire-Love4ever

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #841 on: April 04, 2011, 07:17:15 pm »
ANYONE HAVING ANSWERS FOR UNIT 4 EXAMZONE ANSWERS IN THE TEXTBOOK??????????????????????

PLEASE HELP!!!!!!!!!!
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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #842 on: April 05, 2011, 10:25:20 am »
Quote from: ~ The Golden Girl ~ on April 03, 2011, 03:25:14 pm
Based on my teacher you have to know some essential ones in case they're not given ;)

Like?
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Offline The Golden Girl =D

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #843 on: April 05, 2011, 12:47:01 pm »
Quote from: The Secret on April 05, 2011, 10:25:20 am
Like?

I'm sorry I think I wrote that while daydreaming... My teacher says that they'll be given you don't have to memorize * they're A LOT , I tried to memorize but I easily forgot them  :-\ * ...

P.S. No you don't need to ;)
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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #844 on: April 05, 2011, 02:16:29 pm »
Quote from: ~ The Golden Girl ~ on April 05, 2011, 12:47:01 pm
I'm sorry I think I wrote that while daydreaming... My teacher says that they'll be given you don't have to memorize * they're A LOT , I tried to memorize but I easily forgot them  :-\ * ...

P.S. No you don't need to ;)

hahaha :D It's okay! :)
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Offline ~ Miss Relina ~

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #845 on: April 06, 2011, 02:31:22 pm »
if anyone of guys know the expermint abt the making of double salt preparation of a double salt (ammonium iron(II) sulfate from iron,ammonia and sulfuric acid plz post me soon i searched internet but no result yet
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Offline Amii

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #846 on: April 06, 2011, 02:50:16 pm »
http://www.chemistry-react.org/go/default/Faq/Faq_22913.html

Check this link please - It might help

Take care  :D
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Offline Blizz_rb93

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #847 on: April 06, 2011, 03:13:03 pm »
I have this question regarding the standard enthalpy change of combustion
is there anything that could help me when i want to write down the equation for a reaction in which the enthalpy change is the standard enthalpy change of combustion

like for example,
C2H6 (g) ; C2H6 (g) + 7/2 O2 (g) --> 2CO2 (g) + 3H2O (l)

like how would we come up with the products?? i know this might be a stupid question or something lol but im studying chemistry AS all alone without any teachers since our teacher last year didn't cover the material for us so yeah =/

anyways i'd appreciate any help!! thank you =)
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Offline The Golden Girl =D

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #848 on: April 06, 2011, 03:25:59 pm »
Quote from: Blizz_rb93 on April 06, 2011, 03:13:03 pm
I have this question regarding the standard enthalpy change of combustion
is there anything that could help me when i want to write down the equation for a reaction in which the enthalpy change is the standard enthalpy change of combustion

like for example,
C2H6 (g) ; C2H6 (g) + 7/2 O2 (g) --> 2CO2 (g) + 3H2O (l)

like how would we come up with the products?? i know this might be a stupid question or something lol but im studying chemistry AS all alone without any teachers since our teacher last year didn't cover the material for us so yeah =/

anyways i'd appreciate any help!! thank you =)

I don't get your question  :-X
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Offline Blizz_rb93

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #849 on: April 06, 2011, 03:31:35 pm »
Like ok they give us

CH3OH (l) and they want us to write an equation for the reaction in which the enthalpy change is the standard enthalpy change of combustion

What i wanna know is how do we write the equation? how do we know what the products in the reaction are? I know that CH3OH will react with O2 as it is a combustion reaction so yeah =p
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Offline The Golden Girl =D

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #850 on: April 06, 2011, 03:35:28 pm »
Quote from: Blizz_rb93 on April 06, 2011, 03:31:35 pm
Like ok they give us

CH3OH (l) and they want us to write an equation for the reaction in which the enthalpy change is the standard enthalpy change of combustion

What i wanna know is how do we write the equation? how do we know what the products in the reaction are? I know that CH3OH will react with O2 as it is a combustion reaction so yeah =p

I think you want me to tell ou how to know what the product is ?

in that case in ALL combustion reactions the products are CO2 and H2O ....that's a MUST .... I suggest you give us examples of reactions in which you were not able to know what the products are cuz that'll it make it easy for us to help  :)
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Offline Blizz_rb93

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #851 on: April 06, 2011, 03:43:36 pm »
Oh okay then I get it now :D haha thank you :D
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Offline The Golden Girl =D

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #852 on: April 06, 2011, 05:24:59 pm »
your welcome :)
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Offline Amii

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #853 on: April 06, 2011, 05:44:16 pm »
Question 5 Please
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Offline Blizz_rb93

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #854 on: April 07, 2011, 05:04:17 pm »
Hydrogen Chloride, HCL can be made by heating potassium chloride with concentrated sulfuric acid:

H2SO4 (l) + 2KCl (s) -> 2HCL (g) + K2SO4 (s)

Given the information:

H2SO4 (l) + 2KOH (s) -> K2SO4 (s) + 2H2O (l)   ; Enthalpy change under standard conditions = -342kJ

HCl (g) + KOH (s) -> KCl (s) + H2O (l) ; Enthalpy change under std. conditions = -204 kJ

calculate the standard enthalpy change for the formation of hydrogen chlodirde from potassium chloride and concentrated sulfuric acid.

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