Full O-Level GUIDANCE AND HELP!

[Aiza hanif]

i was told that in compulsary 10 marks ques. in q1 .. there is no need to write conclusion n starting statement .. is it?

 

[Sweet Guy]

might just be you,ll never know

then I Know u ...You are an artificial human control by humans

 

[muaz_ali]

Also this

31 Bond breaking is an endothermic process and bond making is an exothermic process. For which change is it not possible, from the equation, to deduce whether the reaction is endothermic or exothermic?

A Cl 2(g) → 2Cl(g)

B H2(g) + Cl 2(g) → 2HCl(g)

C H2O(g) → 2H(g) + O(g)

D H(g) + Cl(g) → HCl(g)

Answer is B. in all rections, either bonds are being broken or created. But in B, bonds are breaking and forming as well so we can't deduce about it's exothermic or endothermic nature.

 

[muaz_ali]

32 Which row is correct for the reaction of the alkene with steam and a catalyst?

alkene - product

A CH3CH=CH2 - CH3CH(OH)CH3 only

B CH3CH2CH=CH2 - CH3CH2CH2CH2OH only

C CH3CH=CHCH3 - CH3CH(OH)CH2CH3 only

D (CH3)2C=CH2 - (CH3)2CHCH2OH only



answer is C...can you please explain?

it's B i think. check it again.

 

[Dark Destination]

it's B i think. check it again.

Lol, why do you think it's B?

 

[muaz_ali]

Lol, why do you think it's B?

and why should I think not. lel. Well, if you are right then explain it to me because I suck at isomers. Also can you explain about isomers a little more.

 

[Dark Destination]

and why should I think not. lel. Well, if you are right then explain it to me because I suck at isomers. Also can you explain about isomers a little more.

You think because the OH group is at the end, that means its the right answer.

The hint of this question is the 'ONLY'.
They are writing that again and again. Which means we have to find the reaction with only one product.

C has only one possible isomeric product.
Others all have two possible products with OH group in different places.

Now this is the type of question people get wrong and lose that '40/40'.

 

[muaz_ali]

You think because the OH group is at the end, that means its the right answer.

The hint of this question is the 'ONLY'.
They are writing that again and again. Which means we have to find the reaction with only one product.

C has only one possible isomeric product.
Others all have two possible products with OH group in different places.

Now this is the type of question people get wrong and lose that '40/40'.

Ah, well in C, H can either go to left neaarby aur right nearby CH2 group then how can it not be isomeric. Well 39 marks are also appreciated in such scenerios.

 

[Dark Destination]

Ah, well in C, H can either go to left neaarby aur right nearby CH2 group then how can it not be isomeric. Well 39 marks are also appreciated in such scenerios.

Because both will be reflections of each other.
Whenever they are reflections, they are technically the same thing. Put the H on the other position, and rotate it 180 degrees and it becomes the same as the other one.

But with other options they are not reflections, but actual isomers, thus producing more than one product.

 

[muaz_ali]

oh my gawd. what the.... I get it. This need my brain to be chopped off.
well are you appearing for A level?
and which subjects in case yes?

 

[Dark Destination]

oh my gawd. what the.... I get it. This need my brain to be chopped off.
well are you appearing for A level?
and which subjects in case yes?

Appearing for A-Level in May-June 2016.

For now, i have Maths, Physics, Chemistry, Further maths, Thinking Skills, General Paper.

I might add like 9 more subjects in January 2016. But for now only 6.

 

[muaz_ali]

Moen Nawazish 1 - 2 Dark Destination.
Lahore m kis school m ho?
I might want to consider doing A level in Lahore.

 

[Dark Destination]

Moen Nawazish 1 - 2 Dark Destination.
Lahore m kis school m ho?
I might want to consider doing A level in Lahore.

Haha, he has 23. I'm no match for him. ._.

LGS.

 

[muaz_ali]

He got As and less A*s, and your result is more meaningful in a certain manner.

 

[Dark Destination]

He got As and less A*s, and your result is more meaningful in a certain manner.

I guess you're right. B|

 

[muaz_ali]

See you at paragon or JT.

 

[Dark Destination]

See you at paragon or JT.

JT

 

[hajraamjad]

Can u give advice for geography! How to prepare it?

 

[Dark Destination]

Can u give advice for geography! How to prepare it?

Master the book + Practice past papers = A*

 

[hajraamjad]

And how to get good marks in history???