Author Topic: CHEM AND BIO HELP AND TIPS HERE  (Read 357102 times)

Offline ambitious94

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2370 on: June 01, 2010, 08:18:26 pm »
Heyy Ivo thanks for ur help man!
Just something i wanna add to that...they add peat (manure) to make the soil acidic, as well as acid! XD

Offline CatAly$t

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2371 on: June 01, 2010, 09:20:24 pm »
OK, Q24, we know that it is a sensory neurone so it must be D.  We know it's the sensory neurone because it has a long dendron and short axon.  Dendron bring information to the cell body, and axon bring information away from the cell body.  Also, the cell body is located outside the spinal cord, so we know it is a sensory neurone.

Q28, I think it's C, because it's developing because there is a vacuole.  Also, it is growing because cell number is increasing.

Q38, B, think of the log phase, exponential, because there are no limiting factors, so everything is in abundance (e.g. unlimited space, food etc)

Did I get them right?

yup...u got them right again...thx for the explanation bro...
InshaAllah 8 A* in IGCSE....Ameen.....

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Offline guMnam

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2372 on: June 01, 2010, 11:14:45 pm »
Thanks

I <3 Challenges
Never give up :)

Offline jellybeans

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2373 on: June 02, 2010, 07:34:54 am »
HELP PLEASE!
bii) & d) ! :D :D :D :D
thaaaanks.
You said I must eat so many lemons cause I am so bitter.

holtadit

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2374 on: June 02, 2010, 07:38:39 am »
Another isomer would be :

CH3-CH=CH-CH3       Name= But-2-ene


For part (d)

monomer is propene   CH3-CH=CH2

« Last Edit: June 02, 2010, 07:40:33 am by The Lion Son Of Canaan »

Offline jellybeans

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2375 on: June 02, 2010, 07:39:33 am »
Another isomer would be :

CH3-CH=CH-CH3       Name= But-2-ene

... explanation ? :(
You said I must eat so many lemons cause I am so bitter.

holtadit

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2376 on: June 02, 2010, 07:43:09 am »
... explanation ? :(

Okay first look at the alkene. How many carbons are there ? 4, right ? So that means it is butene OR Butane.

BUT it has a carbon double bond so it must be an ALKENE hence it is BUTENE !!

Now the isomer of butene can be but-2-ene.  The  numeral 2 signifies that the carbon double bond is located on the SECOND CARBON.

So thats how you do it :)

Offline jellybeans

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2377 on: June 02, 2010, 07:45:45 am »
Okay first look at the alkene. How many carbons are there ? 4, right ? So that means it is butene OR Butane.

BUT it has a carbon double bond so it must be an ALKENE hence it is BUTENE !!

Now the isomer of butene can be but-2-ene.  The  numeral 2 signifies that the carbon double bond is located on the SECOND CARBON.

So thats how you do it :)

thank you. how do you draw dii) ?
By the way... 'The  numeral 2 signifies that the carbon double bond is located on the SECOND CARBON' ? um.. from the right? O.o
You said I must eat so many lemons cause I am so bitter.

holtadit

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2378 on: June 02, 2010, 07:52:00 am »
thank you. how do you draw dii) ?
By the way... 'The  numeral 2 signifies that the carbon double bond is located on the SECOND CARBON' ? um.. from the right? O.o

https://studentforums.biz/index.php/topic,8531.15.html      Read to learn how to name. He is referring to an alkane on the 1st page.


dii) BELOW

Offline jellybeans

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2379 on: June 02, 2010, 07:54:16 am »
https://studentforums.biz/index.php/topic,8531.15.html      Read to learn how to name. He is referring to an alkane on the 1st page.


dii) BELOW

thanks. how do we join 3 of those together? like.. 3 units together? :/
You said I must eat so many lemons cause I am so bitter.

holtadit

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2380 on: June 02, 2010, 07:56:33 am »
thanks. how do we join 3 of those together? like.. 3 units together? :/

I dont understand.  ???

holtadit

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2381 on: June 02, 2010, 08:00:28 am »
He meant how to join three units of monomers?

and By the way+rep.

Thanks :)

Oh, okay. Just remove the brackets and repeat my drawing 3 time making sure the bonds on the side connect to each consecutive unit.

Offline jellybeans

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2382 on: June 02, 2010, 08:01:58 am »
Thanks :)

Oh, okay. Just remove the brackets and repeat my drawing 3 time making sure the bonds on the side connect to each consecutive unit.

hahah lol okay thanks :)
You said I must eat so many lemons cause I am so bitter.

holtadit

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2383 on: June 02, 2010, 08:07:22 am »
hahah lol okay thanks :)

Any time !  ;)

Offline IGCSE AWESOME STUDENT

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2384 on: June 02, 2010, 08:59:55 am »
i really dont understand anything in moles......can some1 gimme a site where they explain how to calculate moles easily? thanks.