Biology; Chemistry; Physics: Post your doubts here!

[funky brat]

main bhai ratnay jaraha hoon sarey colour
bohut hogya

Lekin kahan sey?
Post-man waley notes main to aesa kuch nahi hai. :/

 

[asadalam]

what do we do

the ms states green too,so in cases in which we dont know,our best bet would be to write the color of the positive ion

 

[Abdul Hanan]

wrong, don't extend to axes!

okay....

 

[peacce]

uuuuuuurgh i forgot wot i askd man :O

 

[Awesome12]

okay....

just extend it but not to the axes. I know i may be confusing you, but this is what the marking scheme says.

 

[peacce]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_s07_qp_4.pdf

Q.8 part L funky brat ?????????

 

[peacce]

http://papers.xtremepapers.com/CIE/...l O Level/Chemistry (5070)/5070_w12_qp_42.pdf

Q.8 part L funky brat Maganius

 

[Maganius]

http://papers.xtremepapers.com/CIE/...l O Level/Chemistry (5070)/5070_w12_qp_42.pdf

Q.8 part L funky brat Maganius

Mass of two carboxylic acid groups = ( 12+ 16 + 16 + 1) x 2 = 90

Mass of

= 132-90 = 42

Taking x = 3, mass of carbon = 12 x 3 = 36

Therefore, mass of hydrogen= 42-36 = 6

So, y=6

 

[peacce]

Mass of two carboxylic acid groups = ( 12+ 16 + 16 + 1) x 2 = 90

Mass of

= 132-90 = 42

Taking x = 3, mass of carbon = 12 x 3 = 36

Therefore, mass of hydrogen= 42-36 = 6

So, y=6

why on earth x=3? n how did u deduce ittttttttttttttt ---_____---

 

[Maganius]

why on earth x=3? n how did u deduce ittttttttttttttt ---_____---

Quite frankly , I'm not sure either, I've got solved past papers, So I solved it here from looking at 'em.

I'll practice 'em tonight

Awesome12 @asadaslam funky brat Faizan Muhammmad
Please answer her query

 

[peacce]

Quite frankly , I'm not sure either, I've got solved past papers, So I solved it here from looking at 'em.

I'll practice 'em tonight

Awesome12 @asadaslam funky brat Faizan Muhammmad
Please answer her query

Yes pls

 

[Maganius]

Yes pls

Cheer-up InshaAllah, paper'd be easy ^_^
How's your prep.

 

[peacce]

Cheer-up InshaAllah, paper'd be easy ^_^
How's your prep.

Its ok,..um good so far

 

[asadalam]

Quite frankly , I'm not sure either, I've got solved past papers, So I solved it here from looking at 'em.

I'll practice 'em tonight

Awesome12 @asadaslam funky brat Faizan Muhammmad
Please answer her query

Y U NO SPELL MY NAME RIGHT

why on earth x=3? n how did u deduce ittttttttttttttt ---_____---

Well we have to fine x and y and they are with C and H,so we will remove the other masses:
132-90=42
By deduction the only logical number would be 3C=12x3=36 and 6H=6.

 

[Maganius]

Its ok,..um good so far

Be Confident and have faith in Allah He'll surely reward you for your hard-work

 

[Abdul Hanan]

s11 qp 42 question 8d

green/yellow/colourless- to- purple
as the solution(P) in flask is very dilute it will show a very light colour (a mixture of the fe 2+ and fe 3+ ions) its not red-brown or dirty green as solution DILUTE.
when potassium manganate(VII) is added, the solution changes colour as potassium manganate in excess.

 

[Maganius]

Y U NO SPELL MY NAME RIGHT


Well we have to fine x and y and they are with C and H,so we will remove the other masses:
132-90=42
By deduction the only logical number would be 3C=12x3=36 and 6H=6.

Hehe sorry .-.

 

[Awesome12]

why on earth x=3? n how did u deduce ittttttttttttttt ---_____---

See we can't have 4 as that will give us 48 (12 * 4)
Which is why we use the nearest possible no, to the answer 42, for (Carbon)
Thus 12 * 3 (MR OF CARBON IS 12) = 36
X = 3

42-36
=6
Y= 6

 

[peacce]

See we can't have 4 as that will give us 48 (12 * 4)
Which is why we use the nearest possible no, to the answer 42, for (Carbon)
Thus 12 * 3 (MR OF CARBON IS 12) = 36
X = 3

42-36
=6
Y= 6

ds is so damn confsinggg

 

[Awesome12]

green/yellow/colourless- to- purple
as the solution(P) in flask is very dilute it will show a very light colour (a mixture of the fe 2+ and fe 3+ ions) its not red-brown or dirty green as solution DILUTE.
when potassium manganate(VII) is added, as excess of sulfuric acid present in flask, this makes the colour of it, purple. (remember potassium manganate is purple in acids)

About the last line, the statement is incorrect. We have added the KMnO4 in excess (KMnO4 is purple in colour), and as a result, the solution has turned purple