CHEM AND BIO HELP AND TIPS HERE

[holtadit]

2 H molecules from the alkane cannot be substituted in one go.

You only change the position of the Cl, not the number. This process happens in stages.

The MS says dichlorobutane or 2-chlorobutane (i chose this one as my final answer)..

So how is dichlorobutane written ?

[nid404]

2-chlorobutane is possible....dichlorobutane happens in the second step

What you have drawn is dichlorobutane

2-chlorobutane is Cl on the 2nd carbon

[saywhatsaykobe]

When drawing a magnification of something in Bio, Does everything have to be in the right proportion? Meaning if you've magnified the legs of an insect by 2, then the body and head and eyes should also have to be magnified by 2. Does everything have to be exact?

How does magnification work???

[nid404]

yes everything is magnified by the same amount...so all the parts should approximately be magnified equally

magnification= observed size/ actual size

[saywhatsaykobe]

I suck at drawing so what's the easiest way to do this??? I'm doing May-June 2003 Paper 6 Question 3.

[nid404]

for this one they won't really sit to check ur magnification....but u must enlarge wisely....don't deform the shape of the slug
and simply label the muscular foot, tentacles and the mantle http://commons.wikimedia.org/wiki/File:Slug_parts.png

[saywhatsaykobe]

Damn!!! It's like u no evrything.

Thanks very much!!! And if I have more doubts I know now who I have to ask. HeHeHeHeHeHeHeHeHeHeHeHeHeHeHeHeHeHe!!!!!!!!

[nid404]

oh thank you


yaa sure...i'll do my best to help you

[Saladin]

U can always send me a few, if you get ur hands too full, nid, I just cant help as proactively as before, cuz i have a lot of  stuff to do.

[nid404]

That was very kind of you dude...thank you 

[saywhatsaykobe]

You Welcome!!! Do you know what a suck-back problem is??? It was one of the answers on the chem papers that i was doing for paper 6.

[nid404]

I can answer with relevance to the question...so put the paper up...let me see the setup...then i'll come to know of it

[saywhatsaykobe]

Here it is. Question 6c. And also 6a.

[nid404]

heat applied more towards the end of the test tube...close to the liquid alkane...

okay, if the heat is turned off first, there is a sudden drop in pressure, the water could be drawn into the tube...this is suck-back
To prevent this, the delivery tube is taken off first

[saywhatsaykobe]

Hey nid, do u have some REALLY good Chem and Bio Paper 6 Notes. I'm just looking for paper 6 only... I would appreciate the help...