The Official ‘O Levels’ Thread

[AsadAbrar]

The Official ‘O Levels’ Thread.

I successfully did question 2,i got frustrated for a moment and was like omg omg what is this aahhhhh but den I drank some water,relaxed and cooled down and my mind started working and den my principle's words into my mind that i shud concentrate on the keywords..I think one shud not study from past paper..I'm so lucky that today in the morning i just casually read about last chapters of prophet ...guys please edit ur post so that they don't talk abt question of paper !!!!!!

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This qestion of mine went good...I did 3rd part and 4th part,i was thinking 15 mins before that i shud have done 5th part instead of 3rd but i had no time my 4th and second went great ! but 3rd one,i was not that satisfied although my isl teacher said that i wrote most of the points ...but i still feel as if i shud have done the 5th part instead xD

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btw guys ,can u tell me about those colour indicators and their colour change upon diff reactions ..i have chem atp tomorrow along with mcq and math 2

I did Q4 and Q5. They were pretty easy.


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[Enferno]

If some one wants, i can PM them the complete relevant answer of Question 2, or should I post it here? @AbbY

 

[AbbY]

No answers before 24 hours after the exam passes !

 

[Xerolt9]

[MENTION=25983]AbbY[/MENTION]: Since you're good at moles:

Lets assume that the moles of Sulphuric acid used in an experiment were 0.025.

H2SO4 + 2NaOH = Na2SO4 + H2O

What would be the moles of Sodium Hydroxide then?

It should be 0.5, right? Since 1 mole of H2SO4 reacts with 2 moles of Sodium Hydroxide.

But I don't get why. According to my logic, it should be 0.0125.

 

[Enferno]

No answers before 24 hours after the exam passes !

OKAY man......

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@AbbY: Since you're good at moles:

Lets assume that the moles of Sulphuric acid used in an experiment were 0.025.

H2SO4 + 2NaOH = Na2SO4 + H2O

What would be the moles of Sodium Hydroxide then?

It should be 0.5, right? Since 1 mole of H2SO4 reacts with 2 moles of Sodium Hydroxide.

But I don't get why. According to my logic, it should be 0.0125.

H2SO4                      NAOH
1                             2

0.025                        [I]X[/I]


1 * [I]X[/I]= 2 *0.025

therefore

X=0.5

 

[AbbY]

[MENTION=25983]AbbY[/MENTION]: Since you're good at moles:

Lets assume that the moles of Sulphuric acid used in an experiment were 0.025.

H2SO4 + 2NaOH = Na2SO4 + H2O

What would be the moles of Sodium Hydroxide then?

It should be 0.5, right? Since 1 mole of H2SO4 reacts with 2 moles of Sodium Hydroxide.

But I don't get why. According to my logic, it should be 0.0125.

What Enferno said.

If 1 mole reacts with 2 moles,
x mole will react with 2x moles
and hence 0.025 will react with 0.025(2) moles.

I use the cross multiplication approach though. Simplifies things.

The answer should be 0.05 though. Verify the answer again.

 

[shahzadfootball]

[MENTION=25983]AbbY[/MENTION] your solution is that thinking one or u used the ratio formula

1:2=0.025:x
1/2=0.025/x
2(o.o25)=x
x=0.05 are the moles of 2NaHo used :bdance:

 

[Xerolt9]

Yeah, it's 0.05.

I use the cross multiplication thing too. It makes things very easy. I guess I just made an error there.

Thanks Abby, Enferno and Shahzad.

 

[AbbY]

[MENTION=25983]AbbY[/MENTION] your solution is that thinking one or u used the ratio formula

1:2=0.025:x
1/2=0.025/x
2(o.o25)=x
x=0.05 are the moles of 2NaHo used :bdance:

I can solve moles in my mine apart from the calculation part but it's always best to write it down.

 

[shahzadfootball]

Oan worst day od my life.although papers went gokd but still worst day of my life

 

[NighteySenpai]

No answers before 24 hours after the exam passes !

Why's that?

 

[AbbY]

Why's that?

CIEs policy. They can sue if answers are released on public forums within 24 hours of the paper. Lulz.

Happened a couple of times before. Not worth the risk.

 

[shahzadfootball]

Why's that?

One does not simply ignores the instructions.

 

[Xerolt9]

Ugh, Physics ATP tomorrow. I've never understood what to do for Physics ATP. I've never gotten a bad grade, but I have a bad feeling about this.

 

[shahzadfootball]

Ugh, Physics ATP tomorrow. I've never understood what to do for Physics ATP. I've never gotten a bad grade, but I have a bad feeling about this.

you're doing IGCSE ? :S

 

[Xerolt9]

GCE O levels ._.

I've never really understood the difference between the two though.

 

[supergamer12]

So who nailed Pakistan studies p1 today? It went awesome for me did 1,2,3.

 

[Enferno]

So who nailed Pakistan studies p1 today? It went awesome for me did 1,2,3.

Didn't nailed it, but did 1, 2, 3

 

[AsadAbrar]

The Official ‘O Levels’ Thread.

I did 1,2 and 3 too.

But I couldn't time it well and was mid way in the c part of the last question when the time ended.

But, the questions I did went really well so I'm still hoping for an A in history.


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[supergamer12]

I completed it 5 min before! and I also had to take extra sheet.

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Any tips for Pakistan Studies P2?