Biology; Chemistry; Physics: Post your doubts here!

[ayeshaK]

Yeah sure-its fun to answer,I dnt know why

Haha yeah same here

 

[daredevil]

Q. Which ion is present in the highest concentration in a 2mol/dm3 aqueous solution of sodium sulphate?
A. hydrogen ion H+
B. hydroxide ion OH-
C. sodium ion Na+
D. sulphate ion SO4^2-


the answer is Na+ ion (please explain how)

 

[a.abid]

Q. Which ion is present in the highest concentration in a 2mol/dm3 aqueous solution of sodium sulphate?
A. hydrogen ion H+
B. hydroxide ion OH-
C. sodium ion Na+
D. sulphate ion SO4^2-


the answer is Na+ ion (please explain how)

Uff this is a tough one...is there any vol. given?

 

[ayeshaK]

Q. Which ion is present in the highest concentration in a 2mol/dm3 aqueous solution of sodium sulphate?
A. hydrogen ion H+
B. hydroxide ion OH-
C. sodium ion Na+
D. sulphate ion SO4^2-


the answer is Na+ ion (please explain how)

Sodium. Sodium sulfate produces 2 Na ions and 1 sulfate ion when ionization occurs in the dissolving process

Na2SO4 ===> 2Na^+ + SO4^=
Guess this is right

 

[asd]

Uff this is a tough one...is there any vol. given?

Because the formula is Na2SO4
2 Na+ ions will be dissociated..while others will be 1 each (OH- , SO4 2- , H+ )
daredevil

 

[a.abid]

Because the formula is Na2SO4
2 Na+ ions will be dissociated..while others will be 1 each (OH- , SO4 2- , H+ )
daredevil

oh right.....

 

[beeloooo]

Can anyone help me with the combustion of alkanes , alkenes , alcohols equations ???? balancing them is real tough :/ in high values :/ !! can anyone tell any method to do so ??

 

[ayeshaK]

Can anyone help me with the combustion of alkanes , alkenes , alcohols equations ???? balancing them is real tough :/ in high values :/ !! can anyone tell any method to do so ??

Same problem but i manage them smehw

 

[beeloooo]

Same problem but i manage them smehw

it takes abt 10 mins jus fo 1 mark

 

[asd]

oh right.....

 

[A star]

Can anyone help me with the combustion of alkanes , alkenes , alcohols equations ???? balancing them is real tough :/ in high values :/ !! can anyone tell any method to do so ??

just write the formulae and balance the product side then do the alkane alkene and last oxygen works wonders for me

 

[A star]

what was the ansswer to the lowest centre of gravity one

 

[Fallen316]

what was the ansswer to the lowest centre of gravity one

it was Option F.

 

[UziB]

what was the ansswer to the lowest centre of gravity one

Option C.

 

[A star]

ok

 

[A star]

i drew the question about the field lines from positive to negative but some were outside the page. will they deduct marks

 

[UziB]

i drew the question about the field lines from positive to negative but some were outside the page. will they deduct marks

Nope, as long as you included drawing field lines BETWEEN the spheres and from +ve to -ve, you will be awarded full marks

 

[A star]

thanks alot

 

[daredevil]

Its C.
74.5 -35.5 = 39 which is potassium .
So YCl.
malay

oh DARN!! i did that and then crossed it out bcuz i thought thta i was ust assuming there is one Cl but there cud have been 2 or more. :/

 

[daredevil]

and ayeshaK and asd but howw??? why can't H+ ions be most in number?? it IS an aquesous solution after all. that is what's confusing me