« previous next »
Pages: 1 ... 197 198 [199] 200 201 ... 227   Go Down

Author Topic: CHEM AND BIO HELP AND TIPS HERE  (Read 357590 times)

Offline Vin

  • SF V.I.P
  • ********
  • Posts: 7914
  • Reputation: 52609
  • Gender: Male
    • Theory of Life - A new skew.
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?
Logged

Offline Kim

  • here comes trouble!=D
  • SF V.I.P
  • ********
  • Posts: 9835
  • Reputation: 36270
  • Gender: Female
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
Logged
After all is said and done, more is said than done.

By the time a man realizes that maybe his father was right, he usually has a son who thinks he’s wrong.

The early bird may get the worm, but the second mouse gets the cheese.

Offline Raywin

  • SF Geek
  • ****
  • Posts: 393
  • Reputation: 409
  • Gender: Male
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.. :)
Logged
;D

Offline Vin

  • SF V.I.P
  • ********
  • Posts: 7914
  • Reputation: 52609
  • Gender: Male
    • Theory of Life - A new skew.
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 ;)

Logged

Offline rhea

  • SF Immigrant
  • **
  • Posts: 66
  • Reputation: 82
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!! :-\ :-\ :-\ :-\
Logged

Offline Vin

  • SF V.I.P
  • ********
  • Posts: 7914
  • Reputation: 52609
  • Gender: Male
    • Theory of Life - A new skew.
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.
Logged

Offline Raywin

  • SF Geek
  • ****
  • Posts: 393
  • Reputation: 409
  • Gender: Male
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.. :)  
Logged
;D

Offline Lariemeeva

  • Heavens
  • SF Immigrant
  • **
  • Posts: 81
  • Reputation: 102
  • Gender: Female
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 »
Logged

elemis

  • Guest
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 ;)
Logged

Offline Vin

  • SF V.I.P
  • ********
  • Posts: 7914
  • Reputation: 52609
  • Gender: Male
    • Theory of Life - A new skew.
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?
Logged

Offline The Golden Girl =D

  • Without Allah I'm nothing <3
  • Honorary Member
  • SF Overlord
  • *****
  • Posts: 13757
  • Reputation: 65532
  • Ain't Nothin worth your tears =D
    • www.thegoldengirl157.blogspot.com
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
Logged
Verily, in the remembrance of Allah do hearts find rest(13:28)

Please, Don't forget to Include GG in your Prayers =D

Offline Vin

  • SF V.I.P
  • ********
  • Posts: 7914
  • Reputation: 52609
  • Gender: Male
    • Theory of Life - A new skew.
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)
Logged

Offline Lariemeeva

  • Heavens
  • SF Immigrant
  • **
  • Posts: 81
  • Reputation: 102
  • Gender: Female
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.
Logged

Offline The Golden Girl =D

  • Without Allah I'm nothing <3
  • Honorary Member
  • SF Overlord
  • *****
  • Posts: 13757
  • Reputation: 65532
  • Ain't Nothin worth your tears =D
    • www.thegoldengirl157.blogspot.com
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  :)
Logged
Verily, in the remembrance of Allah do hearts find rest(13:28)

Please, Don't forget to Include GG in your Prayers =D

Offline Vin

  • SF V.I.P
  • ********
  • Posts: 7914
  • Reputation: 52609
  • Gender: Male
    • Theory of Life - A new skew.
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.
Logged
Pages: 1 ... 197 198 [199] 200 201 ... 227   Go Up
« previous next »