Physics, Chemistry and Biology: Post your doubts here!

[afshinsalim]

Oh! Yes, I do understand exactly what you meant! Thank you xD

U welcome

 

[kainat husain]

please can someone post simple notes on chemical changes! all that fuel cell and all please!

 

[kainat husain]

CHEMISTRY HELP!
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s10_qp_61.pdf
question number 2- what is hexene :/
and question num 7
please can some one explain how to do this one!

 

[shafayat]

CHEMISTRY HELP!
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s10_qp_61.pdf
question number 2- what is hexene :/
and question num 7
please can some one explain how to do this one!

hexene is a alkene with 6 carbons ... it has a bouble bond so use bromine water test ... redbrown to colourless !



! n number seven coppercarbonate . heat cuco3 in a dish over a tripodstand and bunsen flame to decompose and get copperoxide and carbondioxide ... take the copper oxide and reduce with carbon in a test tube ...... u wll get copper and carbondioxide... use a fumecupboards and gloves to handle the aparatus as it would be very hot !

 

[sma786]

CHEMISTRY HELP!
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s10_qp_61.pdf
question number 2- what is hexene :/
and question num 7
please can some one explain how to do this one!

Hexene is an alkene, its test would be bromine or potasium dichromate .. i cant explain question 7 .. u can refer a book on extraction ..

 

[prettygirl1]

URGENT HELP NEEDED

can anyone tell me is molecular genetics chp included in o level syllabus?

 

[sma786]

URGENT HELP NEEDED

can anyone tell me is molecular genetics chp included in o level syllabus?

never heard such thing in phy or chem .. dunno abt bio

 

[sma786]

Excuseee me ..
can anyone post the colours of important gases and compunds ?? (salts)
..

 

[prettygirl1]

What abt anyone else?

 

[1D123]

hey,like for the last question in p6 chemistry about the investigation thing i literally have no idea.. any tips?

 

[Andyila1.2]

salam. how are u i'm a new member .. i needed some help in stochiometry in chemistry it's quite hard so plz i need some easy way to understand it .. thnx

 

[tribianni]

helpieeee helpieee needs
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Biology (0610)/0610_w11_qp_31.pdf Q-4ci
and Q4 d
ASAP

 

[ZainH]

helpieeee helpieee needs
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Biology (0610)/0610_w11_qp_31.pdf Q-4ci
and Q4 d
ASAP

For Q4)c)i) Just look at the graph. The fungus is being produced from the beginning but penicillin starts later, meaning the fungus production had started before penicillin therefore penicillin CANNOT be required for the production of the fungus.

For Q4)d) Downstream proccessing is basically needed so it can be in a form that it could be used. It's also needed to remove any impurities that might form in the production of the medicine.

 

[tribianni]

Thnxzzz

 

[tribianni]

cn u answer dis too.....
Discuss whether sickle cell trait is an example of codominance.

 

[ZainH]

cn u answer dis too.....
Discuss whether sickle cell trait is an example of codominance.

Er I'd have to see the question since I don't remember there alleles :s

 

[tribianni]

okieee

 

[ZainH]

okieee

Do you remember what paper it's from?

 

[tribianni]

2011 october .....variant 1

 

[ZainH]

2011 october .....variant 1

Can't find it on xtremepapers, or in my pastpapers lol.. I've only got up until O/N 10
If you've got a link to the paper I could help, otherwise sorry :s