Physics, Chemistry and Biology: Post your doubts here!

[Awesome12]

Chemistry Problem

How is oleum made from the contact process Pls Help THX

React SO3 with H2SO4. You will get oleum. React the oleum with water. You will get H2SO4

 

[Ameena Eesa]

View attachment 41670
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w13_qp_61.pdf
http://papers.xtremepapers.com/CIE/Cambridge%20IGCSE/Chemistry%20(0620)/0620_w13_ms_61.pdf
Question 3 e iii

I too have the same question. Hey Awesome12, help with this

 

[rida.12.!!]

electrolysis of molten potassium chloride ??

 

[kiduskidu]

Chemistry Problem

How is oleum made from the contact process Pls Help THX

 

[rida.12.!!]

electrolysis of molten potassium chloride ??

 

[Ameena Eesa]

electrolysis of molten potassium chloride ??

K+ goes to cathode (K+ + e- ---> k)
Cl- goes to anode ( Cl- ----> Cl + e-)

The electrodes are made of carbon.

 

[Ameena Eesa]

Chemistry Problem

How is oleum made from the contact process Pls Help THX

http://www.gcsescience.com/aa15.htm

 

[rida.12.!!]

K+ goes to cathode (K+ + e- ---> k)
Cl- goes to anode ( Cl- ----> Cl + e-)

The electrodes are made of carbon.

thx

 

[rida.12.!!]

Explain the term decant.

 

[Ameena Eesa]

To pour off.

 

[rida.12.!!]

part c please

 

[Awesome12]

View attachment 41687part c please

Just perform chromatography

 

[Omar alnajjar]

HEY GUYS , THERE WAS THAT QUESTION IN BIO EXAM PAPER 6 ABOUT THE PARASITE WHAT WAS THE CORRECT ANSWER ARACHNID OR INSECT?

 

[rida.12.!!]

Just perform chromatography

i know it's chromatography but i don't know the steps??!!

 

[rida.12.!!]

HEY GUYS , THERE WAS THAT QUESTION IN BIO EXAM PAPER 6 ABOUT THE PARASITE WHAT WAS THE CORRECT ANSWER ARACHNID OR INSECT?

which variant??

 

[Omar alnajjar]

61 BIO THAT PARASITE QUESTION

 

[Awesome12]

Help in (ii) and (iii) plsssssssssssssss........................................

Do check the marking scheme again. I don't think these are the answers

 

[rida.12.!!]

61 BIO THAT PARASITE QUESTION

ohh but i'm 62 !!

 

[rida.12.!!]

Just perform chromatography

can you give the steps??!!?? plz

 

[slisjunknown]

View attachment 41687part c please

Chromatography...quite simple.Take Rf values and compare