All things u need to know about Chemistry P1 &P3

[Faiza Anwar]

help plzz !!

plzz help with this Question !!

 

[The Chill Master]

plzz help with this Question !!

yep solving it just a few more minutes

 

[Faiza Anwar]

yep solving it just a few more minutes

yeah !

 

[Faiza Anwar]

melting points dec as we go down the group in group 1.

 

[The Chill Master]

yeah !

i got the answer bu using volume find no.of moles
no.of moles=volume/24
150/24=6.25
100/24=4.17
20/24=0.83
now divide by smallest mole
6.25/0.83=7.5
4.17/0.83=5
0.83/0.83=1

means we need 5 moles of Co2 mens eqn for co2 is 5CO2
now we need 7.5 moles of Oxygen so it is 7.5O2
now write
CH+7.5O2=5Co2+H2O
now balance it
means
5 carbon atoms required since u cannot change the values obtained

 

[The Chill Master]

melting points dec as we go down the group in group 1.

yep it decreases

 

[Faiza Anwar]

#The Chill Master when will u finish solving that Question? plzz do it quickly !!

 

[The Chill Master]

did it check

#The Chill Master when will u finish solving that Question? plzz do it quickly !!

 

[Faiza Anwar]

i got the answer bu using volume find no.of moles
no.of moles=volume/24
150/24=6.25
100/24=4.17
20/24=0.83
now divide by smallest mole
6.25/0.83=7.5
4.17/0.83=5
0.83/0.83=1

means we need 5 moles of Co2 mens eqn for co2 is 5CO2
now we need 7.5 moles of Oxygen so it is 7.5O2
now write
CH+7.5O2=5Co2+H2O
now balance it
means
5 carbon atoms required since u cannot change the values obtained

i also tried solving the same way but i got diff values for moles nd i didn't know how to apply them..
but u have taken the volume in cm^3... but we have to convert it in dm^3 before dividing by 24???

 

[The Chill Master]

i also tried solving the same way but i got diff values for moles nd i didn't know how to apply them..
but u have taken the volume in cm^3... but we have to convert it in dm^3 before dividing by 24???

u can do u wll get same answer

 

[Faiza Anwar]

u can do u wll get same answer

how? i learned that its compulsory to convert in dm ^3.. isn't it ?

 

[Faiza Anwar]

u can do u wll get same answer

the ans in mark scheme is any eq of combustion of alkene.. how can we know its alkene or alkane ?

 

[The Chill Master]

how? i learned that its compulsory to convert in dm ^3.. isn't it ?

ya u need to

 

[The Chill Master]

the ans in mark scheme is any eq of combustion of alkene.. how can we know its alkene or alkane ?

look
as u got 5CO0 & 7.5O2 and u got 1 mole of CH
so that means u cant even change moles
so here u go
C5H10+7.5O0=5CO0+5H2O

 

[Faiza Anwar]

look
as u got 5CO0 & 7.5O2 and u got 1 mole of CH
so that means u cant even change moles
so here u go
C5H10+7.5O0=5CO0+5H2O

thankyou !

 

[Harsh Poddar]

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[The Chill Master]

I've made this site that can be used to quickly access past papers to all the subjects of IGCSE, and AS and A level students. Try it out and please give feedback. Already being used by 1100+ users across 53 countries.

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A & AS Level: gopapers.net/alevel.html

nice

 

[f.mohamed]

Good Luck To Everyone !

 

[Lola_sweet]

Good Luck To Everyone !

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[f.mohamed]

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