Chemistry Doubts: IGCSE Paper 3

[Manobilly]

Can some one explain to me 9 c)
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s09_qp_3.pdf

The quation is Si + F2 which gives SiF4
We have moles of silicon ,which means the ratio of the reaction is 1:1 so the products SiF4 will also be 0.08 moles.
We have mass of Fluorine ,we can divide it by Flourine's mass to get no.of moles which will be 0.16.
So Silicon is less its only 0.08 while Fluorine is 0.16 enough for the reaction.

cii will be 0.08 as mentioned above.

 

[Yousif Mukkhtar]

The quation is Si + F2 which gives SiF4
We have moles of silicon ,which means the ratio of the reaction is 1:1 so the products SiF4 will also be 0.08 moles.
We have mass of Fluorine ,we can divide it by Flourine's mass to get no.of moles which will be 0.16.
So Silicon is less its only 0.08 while Fluorine is 0.16 enough for the reaction.

cii will be 0.08 as mentioned above.

Thanks man.

 

[Manobilly]

 

[Sajal mehta]

The quation is Si + F2 which gives SiF4
We have moles of silicon ,which means the ratio of the reaction is 1:1 so the products SiF4 will also be 0.08 moles.
We have mass of Fluorine ,we can divide it by Flourine's mass to get no.of moles which will be 0.16.
So Silicon is less its only 0.08 while Fluorine is 0.16 enough for the reaction.

cii will be 0.08 as mentioned above.

can u tell me wats the answer for c i)??.....im confused for that bit i understood the part ii)

 

[Manobilly]

For c(i) It will be Silicon ,as i explained in the above explanation.

 

[BumbleBEA]

Can anyone give me a list of all the catalysts we have to know, and what reactions they're used in? I'm so confused right now!

 

[RoyalPurple]

how can i exactly describe metallic bonding for 3 marks?? :S

 

[Beedo]

Can anyone give me a list of all the catalysts we have to know, and what reactions they're used in? I'm so confused right now!

V2O5 in Contact process
Fe powder in Haber process
Al2O3 or SiO2 in cracking of hydrocarbons
MnO2 in lab preparation of O2

Please someone complete if there is anymore

 

[dana xP]

ummmmmmm guys can any body help me plz ?
i want a convincing anwer to 'use the kinetic theory to explain the process of diffusion' !!

 

[Hamzeh S]

Guys When Drawing Structure for example carbonyl chloride
O double bond C Bonded to 2 cl atoms
should i draw circle or just Draw the same structure but add eletctrons not sure someone post a pic please i would rreally appreciate it

 

[Mohamed Hussein]

I want to know what happens to metal compounds if heated........ such as metal carbonates, hydroxides or nitrates

 

[Billy123]

Summer 2009 Chemistry Paper 32.
Can anyone teach me the Question Part B in Page number 7? Please help as soon as possible!

 

[RoyalPurple]

Summer 2009 Chemistry Paper 32.
Can anyone teach me the Question Part B in Page number 7? Please help as soon as possible!

no. of moles of T nitrate: no. of moles of sodium phosphate
0.012 : 0.008
3 : 2
formula of T phosphate-T3(PO4)2

 

[Sajal mehta]

For c(i) It will be Silicon ,as i explained in the above explanation.

but i dont get it u gave the example of silicon and flourine but its bromine...or do u just mean to say that u can use any halogen to solve it

 

[RoyalPurple]

I want to know what happens to metal compounds if heated........ such as metal carbonates, hydroxides or nitrates

metal carbonate ----> metal oxide + CO2
grp1 metal hydroxide do not decompose..
grp2 metal hydroxide nd onwrds ----> metal oxide + H2O

grp1 metal nitrates ---->metal NITRITE+ O2
grp 2 metal nitrates ----> metal oxide + NO2 + O2

 

[JOEJOE]

Thanks alot bro RoyalPurple!

 

[aliqamar1995]

I need help on isomers ! which isomers do we have to learn in our syllabus please any links or can someone make it ! :/

 

[RoyalPurple]

Thanks alot bro RoyalPurple!

mention not!

 

[Mohamed Hussein]

RoyalPurple
thanks alot <3

 

[Sajal mehta]

For c(i) It will be Silicon ,as i explained in the above explanation.

nvm that file had 2 papers...we both saw the wrong paper...i get it now...thanks