Dekoyl's Questions

[TrueTears]

2nd structure of the 1st column is the same as the 3rd structure of the 2nd column

1st structure of the 1st column is the same as the 2nd structure of the 2nd column

Hence as ed_saifa said, they did 2 isomers twice.

[dekoyl]

Yep thanks everyone. I'm beginning to find a bit of sloppiness with Heinemann =( Typos and these answers. Confuses weak people like me.

[TrueTears]

Yep thanks everyone. I'm beginning to find a bit of sloppiness with Heinemann =( Typos and these answers. Confuses weak people like me.

yeah some of their wrong answers are just totally wack lol

[Mao]

1-chloropentane
2-chloropentane
3-chloropentane
1-chloro-2-methylbutane
2-chloro-2-methylbutane
2-chloro-3-methylbutane (or 3-chloro-2-methylbutane)
1-chloro-3-methylbutane
1-chloro-2,2-dimethylpropane

I think these are the isomers. (hopefully I haven't missed any)

[dekoyl]

Give an example to illustrate the usefulness of mitochondrial DNA in forensic analysis.

Thanks :S

[d0minicz]

Say a hair was found at a crime scene. You'd use Mitochondrial DNA , as the shafts of hair does not have a nucleus, thus you wouldnt be able to extract DNA from there. And there are thousands of copies of mtDNA in cells so you have a better chance of extracting enough mtDNA for analysis if the sample is very old and degrading.

[dekoyl]

Say a hair was found at a crime scene. You'd use Mitochondrial DNA , as the shafts of hair does not have a nucleus, thus you wouldnt be able to extract DNA from there. And there are thousands of copies of mtDNA in cells so you have a better chance of extracting enough mtDNA for analysis if the sample is very old and degrading.

Ah thanks. Good example too (better than the book).


Offtopic: Is that Sagat? Tiger flame x100

[d0minicz]

Sagat wooooooohhhhhhhhhhhhhhhh muaythaiiiiiiiiiiiiiii
No prob

[polky]

Give an example to illustrate the usefulness of mitochondrial DNA in forensic analysis.

Thanks :S

Also, mtDNA is only transmitted from the mother (maternally inherited).   It doesn't change much from mother to daughter (unlike usual DNA in the nucleus which is made up of half mother half father). Thus you can trace the lineage of species through females.

More biology-ish, really.  Doubt you need to know this at all.

[dcc]

Off-topic:

You can actually use mitochondrial DNA to trace all of humanity to a common set of 7 females.  Cool, huh?

chemistry fucking sucks dicks

[dekoyl]

Why is sodium salt of acetylsalicyclic acid more soluble than normal aspirin?

I didn't really understand the book's answer about solvation sheaths =\

Thanks

[TrueTears]

If you take a look at the structure of normal aspirin, the COOH group could indeed form hydrogen bonds to be soluble in water, however its large molecular structure renders it insoluble in water.
By changing the carboxy functional group into a sodium salt makes the whole molecule into a positively charged ion. This way, it is much more likely to form dipole - ion attractions in water, hence it will be much more soluble.

[dekoyl]

In the book when they write the reaction between butane and chlorine, the product is .
Is it because it's a substitution reaction they don't write as there could also be ?

Thanks

[TrueTears]

In these type of reaction pathways, you do not have to show all the products. (You only have to show the product which is desired)

EDIT: I remember clearly the book saying it somewhere in those small boxes they have on the side... but I just can not find it anywhere. sigh...

[dekoyl]

^I'll keep an eye out for that box Thanks TT.