Chemistry: Post your doubts here!

[anastasia grey113]

shit, i wrote about the insufficient range. was about to write that it's not sensitive at higher temp but the time got over.

ohhhhhh its ok
just make up for wut u lost in p4
n pray that the threshold for p5 is low
but considering the variety of mistakes all of us have made, i think it may be lower than 24

 

[anastasia grey113]

why was the temperature not a 100 degrees

The pressure was high
tho i wrote low -.-

 

[Zaki ali asghar]

IT WAS HIGH? really? i wrote first that it was low but then changed to high. i really hope the threshold is around 20

 

[anastasia grey113]

IT WAS HIGH? really? i wrote first that it was low but then changed to high. i really hope the threshold is around 20

yh well thaz wut my friends said
yh same
n idk but i found it slightly trickier than mj 2017 n it had a threshold of 24
so i think itll be lower than that this time

 

[Zaki ali asghar]

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

 

[Holmes]

I wrote AlCl3

that's right but I wrote KCL instead

 

[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.