Chemistry: Post your doubts here!

[étudiante]

thxx a lot

ur welcum
remmeber me in ur prayers please

 

[saudha]

will do inshallah.... do the same 4 me

 

[étudiante]

will do inshallah.... do the same 4 me

sure Inshallah

 

[angelgirl:)]

The Haber process for the manufacture of ammonia is represented by the following equation
N2
(g) + 3H
(g) 2NH(g) *H = –92kJmol
　




Which statement is correct about this reaction when the temperature is increased?
A Both forward and backward rates increase.
B The backward rate only increases.
C The forward rate only increases.
D There is no effect on the backward or forward rate.

y the answer is A instead of B ?

 

[étudiante]

The Haber process for the manufacture of ammonia is represented by the following equation
N2
(g) + 3H
(g) 2NH(g) *H = –92kJmol
　




Which statement is correct about this reaction when the temperature is increased?
A Both forward and backward rates increase.
B The backward rate only increases.
C The forward rate only increases.
D There is no effect on the backward or forward rate.

y the answer is A instead of B ?

because they are talking about RATE. the rate ALWAYS increases with temperature and in both directions

 

[angelgirl:)]

saudha?

 

[angelgirl:)]

because they are talking about RATE. the rate ALWAYS increases with temperature and in both directions

oh... thanks..

 

[étudiante]

oh... thanks..

ur welcome

 

[Amaryllis]

hi
i have some doubts
http://www.xtremepapers.com/papers/...d AS Level/Chemistry (9701)/9701_s07_qp_1.pdf
q no. 3 why A it should be B
q 12
q26 can anybody explain it please
q32 why its C graphite contains only vanderwaals force

 

[saudha]

saudha?

yah?

 

[étudiante]

hi
i have some doubts
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s07_qp_1.pdf
q no. 3 why A it should be B
q 12
q26 can anybody explain it please
q32 why its C graphite contains only vanderwaals force

it cant be B because atoms CAN be split into subatomic particles.. (remmeber frm physics )
C
Q26..
it has to be a tertiary alcohol as it doesn't react wid MnO4- ..... chiral carbon so we need three differnt groups... (the general formula shows dat there are no C+C either)
draw it out n u'll see the best way will be to have a central C wid one -OH grp, one methyl, one ethyl and one propyl grp attatched... thus 7 atoms required

 

[angelgirl:)]

m/j 2010 Q no.11...y cant the anser be B insted of A?

 

[Amaryllis]

it cant be B because atoms CAN be split into subatomic particles.. (remmeber frm physics )
C
Q26..
it has to be a tertiary alcohol as it doesn't react wid MnO4- ..... chiral carbon so we need three differnt groups... (the general formula shows dat there are no C+C either)
draw it out n u'll see the best way will be to have a central C wid one -OH grp, one methyl, one ethyl and one propyl grp attatched... thus 7 atoms required

thank you so much... but why in Q 12 its B ,i always know that ALCL3 is the compound that can act as ionic and covalent

 

[saudha]

the qs is not clear angelgirl...

 

[étudiante]

thank you so much... but why in Q 12 its B ,i always know that ALCL3 is the compound that can act as ionic and covalent

ur welcum
yes! it IS AlCl3 that acts as ionic and covalent... i think i wrote C dere... or must b a typos >.< sorry...

 

[Amaryllis]

ur welcum
yes! it IS AlCl3 that acts as ionic and covalent... i think i wrote C dere... or must b a typos >.< sorry...

thanks and good luck in your exam

 

[angelgirl:)]

the qs is not clear angelgirl...

m/j 2010

 

[étudiante]

thanks and good luck in your exam

ur welcome same to u 2

 

[saudha]

ok

m/j 2010 Q no.11...y cant the anser be B insted of A?

for this q ... i dont noe why A is the answer but B cannot be as if u ass chloride ions ..... it needs a supply of oxygen and cannot form ClO- ion

 

[angelgirl:)]

m/j 2010

m/j 2010 Q NO,11