Biology; Chemistry; Physics: Post your doubts here!

[Maganius]

part L

I haven't practiced 'em yet; will do it later. So, I'm not sure either.

 

[Maganius]

how b but

It's (B).
It can't be (A) 'cause it's only talking about magnesium, whereas we are concerned with *Hydrogen* only here.
It can't be (C) 'cause the reaction has ended, it's not increasing nor decreasing.
It can't be (D) either' cause there's no mention of concentration here.

It's only asking us about Hydrogen, so therefore (B) shows that No more hydrogen is being produced as the reaction has stopped.

 

[Faizan Muhammmad]

GUYS!
How many colours are you learning?
like do you know silver bromide is cream or you would write white by assumption?

 

[Maganius]

GUYS!
How many colours are you learning?
like do you know silver bromide is cream or you would write white by assumption?

I'll go with the second one

 

[funky brat]

GUYS!
How many colours are you learning?
like do you know silver bromide is cream or you would write white by assumption?

Yeah, I would write white. Because most if them are white.

 

[funky brat]

C ---H
12 + 2 =14
always divide by 14

shit it got corrupted lol xD

That trick thing, I always do like that. I wonder if there's any other way.

 

[Faizan Muhammmad]

Yeah, I would write white. Because most if them are white.

so thats it?
like all silver metals have white compound
no specifics?

 

[funky brat]

part L

What question do you need help with?

 

[funky brat]

so thats it?
like all silver metals have white compound
no specifics?

I can't really make a bold statement but yeah, you may say.

 

[ciesgetoveralready]

ciesgetoveralready can u explain me dis too? http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_s07_qp_4.pdf q.8 part l.. this has ben askd before but i dint get it

I think you already got it?

 

[funky brat]

Guys, I have problem with writing ionic equations, any tips?
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_s08_qp_2.pdf
Like in B7 part a, I wrote K+(aq) Cl- (aq) = KCl (s) but they have written a different equation.
http://papers.xtremepapers.com/CIE/...al O Level/Chemistry (5070)/5070_s06_qp_2.pdf
Question 10 cii. :/

 

[ciesgetoveralready]

Guys, I have problem with writing ionic equations, any tips?
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_s08_qp_2.pdf
Like in B7 part a, I wrote K+(aq) Cl- (aq) = KCl (s) but they have written a different equation.

I have the same problem :'(

 

[Awesome12]

Guys, I have problem with writing ionic equations, any tips?
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_s08_qp_2.pdf
Like in B7 part a, I wrote K+(aq) Cl- (aq) = KCl (s) but they have written a different equation.

Why are you solving P2?

 

[Faizan Muhammmad]

I can't really make a bold statement but yeah, you may say.

look at s06_qp4
question 3a i
ms says cream

 

[funky brat]

I have the same problem :'(

They are weird, I mean they say spectator ions do not take part when they are clearly.

 

[funky brat]

look at s06_qp4
question 3a i
ms says cream

To white ghalat ho ga?
Yeh kahan se yad karnay hain phir?
All are compounds defined in the syllabus jin kay colours yad karnay hain?

 

[asadalam]

Guys, I have problem with writing ionic equations, any tips?
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_s08_qp_2.pdf
Like in B7 part a, I wrote K+(aq) Cl- (aq) = KCl (s) but they have written a different equation.
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_s06_qp_2.pdf
Question 10 cii. :/

Here ya go lassie

Cl2 + 2K+ + 2Br- ----> 2K+ + 2Cl- + Br2

We cut out 2k+ on both sides as kcl is also aqueous and we get the answer

 

[funky brat]

Why are you solving P2?

I'm not solving them. I just saw these questions.

 

[asadalam]

To white ghalat ho ga?
Yeh kahan se yad karnay hain phir?
All are compounds defined in the syllabus jin kay colours yad karnay hain?

Yes it is cream and white would be wrong,my sir penalised this

 

[ciesgetoveralready]

look at s06_qp4
question 3a i
ms says cream

Listen , dont worry about the makring schemes. Marking schemes are made after the papers are checked. White and Cream , there isnt much of a difference and alhamdolillah CIE is not THAT strict. They give us thori boht leniency.