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Author Topic: CHEM AND BIO HELP AND TIPS HERE  (Read 333222 times)

Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2970 on: June 06, 2010, 06:36:19 pm »
Quote from: Raywin on June 06, 2010, 06:31:09 pm
Yup, i have to go too.. :) GOOD LUCK TO EVERYONE FOR TOMORROW.. :P ITS 1:30 am here.. :P
Dude where do you live? China?
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Offline Kim

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2971 on: June 06, 2010, 06:36:56 pm »
Quote from: CatAly$t on June 06, 2010, 06:35:16 pm
can somebody confirm the answer??

m confused now...

haha dont be confused
both the answers by raywin are correct
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Offline Raywin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2972 on: June 06, 2010, 06:37:10 pm »
Quote from: ~VIN1094~ on June 06, 2010, 06:36:19 pm
Dude where do you live? China?

Nope, Singapore.. :)
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2973 on: June 06, 2010, 06:38:07 pm »
Quote from: CatAly$t on June 06, 2010, 06:35:16 pm
can somebody confirm the answer??

m confused now...

Raywin is right ;)

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Offline rhea

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2974 on: June 06, 2010, 06:41:54 pm »
those graph questions...
on rate of reaction..

when does the FINAL volume change?
what conditions?

and when does the FINAL volume remain the SAME, even though the graph is steeper??!!


plz help out!! :-\ :-\ :-\ :-\
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2975 on: June 06, 2010, 06:44:28 pm »
Quote from: rhea on June 06, 2010, 06:41:54 pm
those graph questions...
on rate of reaction..

when does the FINAL volume change?
what conditions?

and when does the FINAL volume remain the SAME, even though the graph is steeper??!!


plz help out!! :-\ :-\ :-\ :-\

Final volume changes when a different concentration is used/ reactant used in excess.

Final volume same when same concentration is maintained but a different reactant used/ a catalyst is used.
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Offline Raywin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2976 on: June 06, 2010, 06:44:45 pm »
Quote from: rhea on June 06, 2010, 06:41:54 pm
those graph questions...
on rate of reaction..

when does the FINAL volume change?
what conditions?

and when does the FINAL volume remain the SAME, even though the graph is steeper??!!


plz help out!! :-\ :-\ :-\ :-\

Im guessing that the final volume only changes when the concentration changes? Ppl just see if this is ryte yeah.. ;)

And the final volume remains the same when the reaction is catalysed or increase in temperature.. :)  
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Offline Lariemeeva

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2977 on: June 06, 2010, 06:45:13 pm »
@Ari: Ah, sorry, I didn't mean to sound that way, I was just a little frustrated.
I apologize again for causing chaos in your domain, my greatest apologize to anyone who I offended *bows*

@deadman786: So you're saying simply that this is true [Alkane --> Alkene + Alkane + Hydrogen]? If so, are there any rules for determining the products of this type of reaction?
My book doesn't state Alkane as a product, so it's a little confusing.  
« Last Edit: June 06, 2010, 06:47:54 pm by Lariemeeva »
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elemis

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2978 on: June 06, 2010, 06:47:22 pm »
@Larimeeva  Its alright, we all make mistakes and I can understand your frustration. :)

Good luck with your exam and all the best ;)
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2979 on: June 06, 2010, 06:52:29 pm »
Quote from: Lariemeeva on June 06, 2010, 06:45:13 pm
@Ari: Ah, sorry, I didn't mean to sound that way, I was just a little frustrated.
I apologize again for causing chaos in your domain, my greatest apologize to anyone who I offended *bows*

@deadman786: So you're saying simply that this is true [Alkane --> Alkene + Alkane + Hydrogen]?
My book doesn't state Alkane as a product, so it's a little confusing.  

Let me give you an example..

Cracking of octane C8H18


    H  H   H  H   H   H  H  H  H   H                  H   H  H  H   H          H   H  H  
H- C - C- C- C -C -C -C -C -C -C-H   --->  H-C- C- C- C- C-H   +  C =C- C-H  +    H2
     H  H   H  H   H  H   H  H   H  H                 H   H   H  H  H           H       H  
 
(higher)Alkane                                              Alkane              +    Alkene     +    H2

Octane                                                      Pentane                  Propene       Hydrogen

got it?
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Offline The Golden Girl =D

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2980 on: June 06, 2010, 06:57:30 pm »
i just wanted to say , i hope y'all includin me  KILL  >:( the paper tomorrow  :D
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2981 on: June 06, 2010, 06:58:53 pm »
Quote from: the golden girl on June 06, 2010, 06:57:30 pm
i just wanted to say , i hope y'all includin me  KILL  >:( the paper tomorrow  :D

I wanna roast it in air! :P (sorry lame)
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Offline Lariemeeva

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2982 on: June 06, 2010, 06:59:54 pm »
^Yep, that makes sense completely. It kinda of splits up into two. One last confirmation, you wrote higher Alkanes so cracking of ethane gives ethene and hydrogen only since it's a lower hydrocarbon?

@Ari: Thank you.
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Offline The Golden Girl =D

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2983 on: June 06, 2010, 07:01:08 pm »
Quote from: ~VIN1094~ on June 06, 2010, 06:58:53 pm
I wanna roast it in air! :P (sorry lame)

nah it actually makes sense  :)
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2984 on: June 06, 2010, 07:09:13 pm »
Quote from: Lariemeeva on June 06, 2010, 06:59:54 pm
^Yep, that makes sense completely. It kinda of splits up into two. One last confirmation, you wrote higher Alkanes so cracking of ethane gives ethene and hydrogen only since it's a lower hydrocarbon?

@Ari: Thank you.

Yes. Products depends on how many carbon atoms the alkane being cracked contains.
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