• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

Chemistey Doubts

Messages
497
Reaction score
100
Points
38
gary221 said:
hey i got a doubt!!!


thnx!! :D

The answer is:

JmCullen said:
gary221 said:
hey i got a doubt!!!


thnx!! :D

i think it's D..
coz potassium is high in reactivity.
and it is soluble.
barium sulphate is insoluble. so it can't dissolve in water.

And basically, because it is ionic, and the only soluble ionic there :D
 
Messages
512
Reaction score
64
Points
38
i forgot how to do the first one ............
but for the second one , you have to write catalytic cracking and then also mention that the alkane needs to be heated at a very high temperature .
 
Messages
6,440
Reaction score
31,077
Points
698
JmCullen said:
JmCullen said:
ok!
let's concentrate on paper 3 now. :D

how to find the average reaction rate?
Q3b
http://www.xtremepapers.me/CIE/Cambridg ... _qp_32.pdf

can anyone do this? :(

actually this is quite tricky!!

u hve to divide the vol.by the time to get the rate
so to get d 1st rate,vol = 48cm3 time = 20 s so rate = vol/time = 48/20 = 2.4
d 2nd one vol = 70-48 =22 time = 20 s =22/20 = 1.1
hope u got it!!
 
Messages
5,874
Reaction score
4,242
Points
323
SO2 is oxidised by Bromine to sulphate... It reacts with Barium to form the white ppt of barium sulphate...
 
Messages
164
Reaction score
0
Points
0
xIshtar said:
JmCullen said:
Thanks a lot people!!!!
appreciate it!


another question here..
about the drawing part. ugh.. im always bad in drawing.

http://www.xtremepapers.me/CIE/Cambridg ... _qp_32.pdf

Q5(b)

Make it tetrahedral, and make sure that you maintain the ratio as in Silicon(iv) oxide.
Which is, 1 Silicon : 4 Oxygen
2 Oxygen : 1 Silicon

Thus the formula is maintained.


:)

O
l
Ge
/ l \
O O O
/ \ / \ / \
Ge Ge Ge Ge Ge Ge

is it something like this??
 
Top