Physics, Chemistry and Biology: Post your doubts here!

[thats_me]

no no thnx i got it but y in the product thingy H has no charge Mg + 2H+ > Mg+2 + H2

Look in the acid hydrogen is H+ ,what does this mean? it has lost electron and it became an ion
Now in this reaction Mg is more reactive n it wants to take hydrogen's place , so it becomes very generous and donates it's electron to hydrogen
so hydrogen gains those electron back ,Therefore it's 2H+ to H2

 

[IsraJ]

subject?

Chemistry

 

[thats_me]

Chemistry

u din finish the paper yet? :S

 

[thats_me]

i got u like i knw how to do this
but when we have to make silver chloride we'll do this?
normal eq- AgNO3 + NaCl ------> AgCl + NaNO
NOW how to make this an ionic eq?

AgNO3 + NaCl ------> AgCl + NaNO3
Ag+ + Cl- ---> AgCl2

 

[IGSCE.Geek.]

ahhhhhhhhhhhh help me im mj 2007 question 7d plz!!

 

[kainat husain]

Look in the acid hydrogen is H+ ,what does this mean? it has lost electron and it became an ion
Now in this reaction Mg is more reactive n it wants to take hydrogen's place , so it becomes very generous and donates it's electron to hydrogen
so hydrogen gains those electron back ,Therefore it's 2H+ to H2

ahan thnxxxx nice way to explain

AgNO3 + NaCl ------> AgCl + NaNO3
Ag+ + Cl- ---> AgCl2

Mg + 2H+ -> Mg+2 + H2 here u said Mg will nto have nay charge cux it is a metal! wht abt silver it has a chrge ryte?

 

[kainat husain]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s04_qp_3.pdf
4b (ii) how the grid will b cux b4 they usediron (III) chloride now they'll use iron (II) chloride? how will i make out the difference?
(iii) also

 

[IsraJ]

u din finish the paper yet? :S

oh! i am really sorry! i meant paper 3! but nevermind i got the answer!

 

[thats_me]

ahan thnxxxx nice way to explain

Mg + 2H+ -> Mg+2 + H2 here u said Mg will nto have nay charge cux it is a metal! wht abt silver it has a chrge ryte?

its AgCl* n i din get u?

 

[kainat husain]

its AgCl* n i din get u?

in Mg eq u said Mg is metal so no charge but in silver eq u had put charge for silver why

 

[thats_me]

in Mg eq u said Mg is metal so no charge but in silver eq u had put charge for silver why

Oh ok, thats because there Mg was a metal displacin an acid
where as here a salt (Ag NO3) is displacin another salt(NaCl)
if Ag will be a metal alone then it will not have a charge

 

[IGSCE.Geek.]

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[Maz]

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Can you give the link?

 

[imperial]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w10_qp_31.pdf

8(b)
(solve it all, even though i only could a small part only)

thanks in advance

 

[imperial]

why tin ions does not react with copper metal? (even though tin is more reactive)

 

[EpicLol]

Hi, had a doubt in chemistry
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w10_qp_33.pdf
question 5b (iv) Need a diagram to understand

Yea Im bad a t drwaing sry

 

[imperial]

and also which group nitrates when decomposed gives NITRITE and not nitrogen dioxide, also is there a group with stable nitrates?
which group hydroxides is stable?

 

[AAnsarii]

no no thnx i got it but y in the product thingy H has no charge Mg + 2H+ > Mg+2 + H2

coz it's a gas, n its not in a compound(like in HCl, where it's H+)
hope u got it...

 

[EpicLol]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s04_qp_3.pdf
4b (ii) how the grid will b cux b4 they usediron (III) chloride now they'll use iron (II) chloride? how will i make out the difference?
(iii) also

I think it will be lower as Fe(II) requires less OH- stuff so the OH last for a longer time....but Im not entirely sure....

 

[AAnsarii]

can anyone help me with may june 2009 paper 61 question 5 b?

subject?