Chemistry Doubts: IGCSE Paper 3

[aliqamar1995]

LETS OWN IGCSE ! >_< !! Payback time

 

[Beedo]

4 a)ii) this is precipitation any soluble zinc salt like for example: zinc nitrate+sodium carbonate= zinc carbonate+ sodium nitrate.
4 b) Fe+ 3OH= Fe(OH)3 doesnt need explanation
ii) i dont know why srry

ok thanks
do you know the answers for a)iii and b)iii ?

 

[Dandelion]

Has anyone done the exam ? Variant 2

 

[kanishk]

Has anyone done the exam ? Variant 2

who would have thought chemistry paper 3 would be easier than the physics paper3.....wow.

 

[vinit]

who would have thought chemistry paper 3 would be easier than the physics paper3.....wow.

was the organic chem hard??

 

[kanishk]

was the organic chem hard??

nope...did you finish yours?

 

[BusterSword]

who would have thought chemistry paper 3 would be easier than the physics paper3.....wow.

So what came exactly?
I mean, was it similar to any paper you had previously done?

 

[Naser Al-Ayyoub]

thank god alhumdullah paper 31 was not easy nor hard. Id id good.

 

[Andyila1.2]

Paper 6 is over. Now it's time to worry about Paper 3.​

Post any doubts here, and I'll answer them ​

tell in an easy way ... how is zinc extracted from zinc blende ?

 

[BumbleBEA]

tell in an easy way ... how is zinc extracted from zinc blende ?

Zinc Blende=ZnS

Heat Zinc Blende in Oxygen so that it oxidizes to Zinc Oxide (ZnO)

Reduce the Zinc Oxide using Carbon Monoxide (CO)

The reaction is:

ZnO+CO---->Zn+CO2

Simple enough?

 

[Andyila1.2]

Zinc Blende=ZnS

Heat Zinc Blende in Oxygen so that it oxidizes to Zinc Oxide (ZnO)

Reduce the Zinc Oxide using Carbon Monoxide (CO)

The reaction is:

ZnO+CO---->Zn+CO2

Simple enough?

thnx ...

 

[OneOfAKind]

View attachment 11229

Thanks a lot.. helped a lot, but shouldn't there be a double bond between Carbon and Oxygen in the carboxylic acid functional group:

O-H-C=O .. (I know this is wrongly drawn, but just to give a rough idea.)

 

[Muaaz Iqbal]

Guys is there any easy way to solve paper 3 Because I'm facing Problems in it

 

[Sajjadhussain08]

dears
can anyone have chemistry o level book by christopher n. prescott 3rd eddition pdf please send me
[email protected]