Biology; Chemistry; Physics: Post your doubts here!

[ashiqbal]

frst mcq should have NH4 instead of NH3

and then the answer would have been?

 

[MustafaMotani]

my xy values are varying only two are coming 5400 one is comming 3000 and other 9900

then try that part again u have done listake there.. .... make sure that paper u are using i.e. size of paper should be same as of cie if u are measuring length in mm

 

[MustafaMotani]

and then the answer would have been?

w8

 

[convent2012]

http://www.xtremepapers.com/papers/...nal O Level/Physics (5054)/5054_s10_qp_42.pdf
q2 b ii) ????

 

[MustafaMotani]

frst mcq should have NH4 instead of NH3

ans is A ??

 

[ashiqbal]

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Physics (5054)/5054_s10_qp_42.pdf
q2 b ii) ????

it will be value of t from 5 cm!

 

[ashiqbal]

ans is A ??

yes! how?

 

[MustafaMotani]

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Physics (5054)/5054_s10_qp_42.pdf
q2 b ii) ????

its 1.61 same as 5 cm

 

[a.abid]

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Physics (5054)/5054_s10_qp_42.pdf
q2 b ii) ????

The answer is 1.61.This is because at 5 cm the reading is 1.61 so 95 cm=100-95=5cm,so at 5cm the reading is 1.61

 

[malay]

please explain this question if anyone can:

From which ammonium salt can the greatest mass of ammonia b obtained?
A) 0.5 mole (NH3)2PO4
B) 0.5 mole (NH4)2SO4
C) 1 mole NH4Cl
D) 1 mole NH4NO3

first of all A should be (NH4)3PO4 coz phosphate ion is PO4^-3
den the answer will be A
coz o.5*2=1mol
so mass of nitrogen is
14*3=42*2=84-->greatest
....hopefully

 

[MustafaMotani]

yes! how?

NH3Cl = NH3 + HCL
(Nh4)3PO4 = 3NH3 + H3PO4
(NH3)2SO3 = 2NH3 + H2SO4
NH4NO3 = NH3 + HNO3

NH4)3PO4 according to ques gives 1.5 moles of ammonia while others give 1 mol
Hope I made it easy ..

 

[MustafaMotani]

first of all A should be (NH4)3PO4 coz phosphate ion is PO4^-3
den the answer will be A
coz o.5*2=1mol
so mass of nitrogen is
14*3=42*2=84-->greatest
....hopefully

what have u done
mass of ammonia was asked not nitrogen

 

[beeloooo]

The answer is 1.61.This is because at 5 cm the reading is 1.61 so 95 cm=100-95=5cm,so at 5cm the reading is 1.61

i guess this is because the center is at 50 cm !! at 5 it has a distance of 45 cm and also at 95 it has 45 cm from the center

 

[MustafaMotani]

Ok so I know Its off topic but its still subjectual...
have u got any easy way to learn transformation matrices coz it eats lot of time doing experiments with cordinates

 

[a.abid]

i guess this is because the center is at 50 cm !! at 5 it has a distance of 45 cm and also at 95 it has 45 cm from the center

yeah ur right

 

[a.abid]

Ok so I know Its off topic but its still subjectual...
have u got any easy way to learn transformation matrices coz it eats lot of time doing experiments with cordinates

matrices for physics?

 

[MustafaMotani]

i guess this is because the center is at 50 cm !! at 5 it has a distance of 45 cm and also at 95 it has 45 cm from the center

precisely

 

[MustafaMotani]

matrices for physics?

No its mathematics

 

[a.abid]

No its mathematics

oh acha....well i dunno any simple way to learn them...they take a lot of tym in rattafying

 

[MustafaMotani]

oh acha....well i dunno any simple way to learn them...they take a lot of tym in rattafying

Oh alright ....