Phys p12 and Chem p12- 9th and 10th June,2015 Tips!

[The Sarcastic Retard]

How do I know that covalent bonds are either weak or strong?View attachment 54768 Why the ans is not B? 1s2 2s2 2p2 for one of grp 6 element....View attachment 54769 How to do this?View attachment 54770 I hate these qstns... Someone just tell do I have to make all the structures or there is another way?View attachment 54771 This qstn is tough :SView attachment 54772

last) I am not into orgaanic much yet... m sorry.

 

[Aly Emran]

Mon do they deduct marks in spaces for working if you haven't shown the workings ? And in physics too

They dont even check ur qstn ppr... All OMR sheet... Working is ur choice... Its not a compulsion.

Aly man!! This all are a piece of a cake.. if u are stucked in here... THERE IS HECK A LOT TO LEARN DUDE!!!
Prepare well... I am into some work so cant post the answers.... if anyone wont answer by the time i get free... I will answer 'em

Thank u dude for telling me how weak I am in chem...

1)
When chlorine/bromine/iodine exists as a diatomic molecule, the Cl-Cl/Br-Br/I-I bond is unexpectedly weak. B'coz:~
Size Cl2< Br2 < I2.The atoms are bonded close together, which leads to repulsion between free electrons in the two chlorine/bromine/iodine atoms. Sogoing down the group Van der waals forces increases..
Longer bond length = Strength of covalent bond decreases.

Obviously I know weak vander waal's increases down the group.... But covalent bond... I actually wanted to ask which property of covalent bond depends upon... I got my ans... Bond length.

2) The difference b/w 4th and 5th IE should be greatest.. option C is the correct answer.

But what about 2s orbital? Two electrons gone, do 1s2 2s2 left.... Shouldnt ionization energy be high for 3rd electron and 5th to be released?

3) m of 2NO2 = 92
m of 1/2O2 = 16
92/16 = 1/0.174

Got it thanks

4) IDK any other method.. I DRAW 'EM!!

Okay... But thats lengthy ans time consuming... We can miss 1 or 2 accidentally.

4) 1-butene.....CH2=CHCH2CH3
2. 2-butene...CH3CH=CHCH3
3. methyl-propene...CH2=CCH3CH3...
4. the other cis-trams isomer of 2-butene

I know the ans
I just wanted to confirm isnt there anyother so called formula of finding isomers

 

[fantastic girl]

They dont even check ur qstn ppr... All OMR sheet... Working is ur choice... Its not a compulsion.

Thank u dude for telling me how weak I am in chem...

Obviously I know weak vander waal's increases down the group.... But covalent bond... I actually wanted to ask which property of covalent bond depends upon... I got my ans... Bond length.

But what about 2s orbital? Two electrons gone, do 1s2 2s2 left.... Shouldnt ionization energy be high for 3rd electron and 5th to be released?

Got it thanks

Okay... But thats lengthy ans time consuming... We can miss 1 or 2 accidentally.

I know the ans
I just wanted to confirm isnt there anyother so called formula of finding isomers

lol
no u hve to draw
yea ik....attimes i dont get all the structures in a hurry :/

 

[Aly Emran]

lol
no u hve to draw
yea ik....attimes i dont get all the structures in a hurry :/

Howz prep? I get 31-35 in chem but 27-32 in phys :/

 

[fantastic girl]

Howz prep? I get 31-35 in chem but 27-32 in phys :/

chem is ok Alhamdulillah but physics still not satisfied :/
my range of physics is same like urs
for chem i never counted
chem is less trickier

 

[Aly Emran]

chem is ok Alhamdulillah but physics still not satisfied :/
my range of physics is same like urs
for chem i never counted
chem is less trickier

Yep... Chem is all statements etc... While phys numerical are sometimes confusing...

 

[asadalam]

Yep... Chem is all statements etc... While phys numerical are sometimes confusing...

Lol really?I find Phy more easier in recent years than chem

 

[The Sarcastic Retard]

They dont even check ur qstn ppr... All OMR sheet... Working is ur choice... Its not a compulsion.

Thank u dude for telling me how weak I am in chem...

Obviously I know weak vander waal's increases down the group.... But covalent bond... I actually wanted to ask which property of covalent bond depends upon... I got my ans... Bond length.

But what about 2s orbital? Two electrons gone, do 1s2 2s2 left.... Shouldnt ionization energy be high for 3rd electron and 5th to be released?

Got it thanks

Okay... But thats lengthy ans time consuming... We can miss 1 or 2 accidentally.

I know the ans
I just wanted to confirm isnt there anyother so called formula of finding isomers

what do u mean to say is out of my mind.. ELABORATE for Q2

 

[fantastic girl]

Yep... Chem is all statements etc... While phys numerical are sometimes confusing...

Yea true :/
ikr the numericals drills my head
i hope we get some easy stuff In shaa Allah

 

[The Sarcastic Retard]

Yea true :/
ikr the numericals drills my head
i hope we get some easy stuff In shaa Allah

dont worry, papers are gonna be damn easy, trust me... IF YOU PREPARE/ANSWER SMARTLY

 

[Aly Emran]

Lol really?I find Phy more easier in recent years than chem

Yar ur a 9A* o lvl genius and I am a 3A* old dumb idiot
I dunno anything xD

what do u mean to say is out of my mind.. ELABORATE for Q2

Nothing.... I got it... Thanks for ur help

Yea true :/
ikr the numericals drills my head
i hope we get some easy stuff In shaa Allah

In Shaa Allah... But we have to prepare for the worst!

dont worry, papers are gonna be damn easy, trust me... IF YOU PREPARE/ANSWER SMARTLY

Apkay mun may ghee shakar

 

[asadalam]

Yar ur a 9A* o lvl genius and I am a 3A* old dumb idiot
I dunno anything xD

Nothing.... I got it... Thanks for ur help

In Shaa Allah... But we have to prepare for the worst!

Apkay mun may ghee shakar

9A* kahan se bhai

 

[Aly Emran]

9A* kahan se bhai

Kya matlab?... 9-10A*s toh hoon gay apkay
Apko har qstn ka ans ata ha :3
Or 36/40 in phys is no choti baat :3

 

[asadalam]

Kya matlab?... 9-10A*s toh hoon gay apkay
Apko har qstn ka ans ata ha :3
Or 36/40 in phys is no choti baat :3

6A* thay wese

 

[Aly Emran]

6A* thay wese

Jo bhi ha 3A* say better ha

 

[DJCRUZ3]

The answer is B, why are you adding it?
Shouldn't you subtract the momentum?

 

[Aly Emran]

The answer is B, why are you adding it?
Shouldn't you subtract the momentum?

Velocity direction is changing
Upward velocity is positive and downward is negative so its mv-(-mu)

 

[DJCRUZ3]

Velocity direction is changing
Upward velocity is positive and downward is negative so its mv-(-mu)

Yeah, so shouldn't you subtract? Cause the directions are different..

 

[Aly Emran]

Yeah, so shouldn't you subtract? Cause the directions are different..

Formula of momentum change is=(mv)-(mu)
But u has direction opposite so -u
M=(mv)-(-mu)