Chemistry: Post your doubts here!

[anastasia grey113]

being a pessimist asking this, can you still score an A* with a B in P5 but all other As?

yh lol u can
ive heard abt ppl getting Cs in p3 n getting A*s later on
n p3 has the same weightage

 

[Zaki ali asghar]

someone said that KCL required the least amount of solution to ppt, can it be correct. since the power was 10^_3 for all but the number kept increasing

 

[anastasia grey113]

being a pessimist asking this, can you still score an A* with a B in P5 but all other As?

yh lol u can
ive heard abt ppl getting Cs in p3 n getting A*s later on
n p3 has the same weightage

 

[Error Syntax]

The pressure was low guys because the boiling point of water was below 100 and boiling point is lower when the atmospheric pressure falls from its orginial 101kPA value.

 

[Holmes]

yh lol u can
ive heard abt ppl getting Cs in p3 n getting A*s later on
n p3 has the same weightage

Yes thanks.

 

[sterryfox]

AlCl3
wbu?

lol i used KCl

 

[Error Syntax]

that's right but I wrote KCL instead

yeah I wrote KCL as well.

 

[anastasia grey113]

someone said that KCL required the least amount of solution to ppt, can it be correct. since the power was 10^_3 for all but the number kept increasing

well i dont think so
i think the results were post to be completely opposite for arsenic since it had the opposite charge
if it had least amount in a positively charged iron sol it was post to be the opposite in negatively charged arsenic
idk thaz my opinion

 

[Holmes]

the mass was 1.74 and volume 5cm^3 right?

N used pipette(10cm^3)?

 

[Holmes]

i hope the threshold isn't high enuf n is somewhere around 21 or 22
how hard did u guys find it?
amina1300
Zaki ali asghar
Holmes

The paper wasn't that hard but I made some very serious mistakes.

 

[anastasia grey113]

The pressure was low guys because the boiling point of water was below 100 and boiling point is lower when the atmospheric pressure falls from its orginial 101kPA value.

really?
yh i think u r right now that u say it
idk man

 

[anastasia grey113]

N used pipette(10cm^3)?

i used burette
it was 5

 

[sterryfox]

yeah I wrote KCL as well.

i think the answer is KCl even though most of friends used AlCl3

 

[Error Syntax]

really?
yh i think u r right now that u say it
idk man

I remember it was about 99.48 something, Boiling point increases when you add impurities but when pressure decreases the boiling point decreases as well. It was logical though and i dont know how high pressure would fit to be correct.

 

[anastasia grey113]

I remember it was about 99.48 something, Boiling point increases when you add impurities but when pressure decreases the boiling point decreases as well. It was logical though and i dont know how high pressure would fit to be correct.

yh
n if the atmospheric pressure had been lower, the water will take lesser temp to reach that pressure
oh my god yes my answers correct lol

 

[anastasia grey113]

i think the answer is KCl even though most of friends used AlCl3

well i wrote the same but idk
most of us wrote AlCl3 too

 

[Error Syntax]

i think the answer is KCl even though most of friends used AlCl3

The reason I choose KCL was that it required the least amount of moles as compare to others, like the concentrations were given so you could calculate the amount required and because it was talking about cation as well.

 

[Zaki ali asghar]

A ON 20
A ON 20
A ON 20
PLEASE

 

[Holmes]

what do u guys think about the Kb ( constant for pure water)?

that's what I thought

 

[anastasia grey113]

The reason I choose KCL was that it required the least amount of moles as compare to others, like the concentrations were given so you could calculate the amount required and because it was talking about cation as well.

but that was for iron which was positively charged aint it?