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Chemistry: Post your doubts here!

The Sarcastic Retard

The Sarcastic Retard

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asadalam said:
Thanks a lot bro/sis!Please help out in these as well:
11117386_940665735953617_1959892705_n.jpg

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Click to expand...
Q31
1) Both have proton no. = 3
2) both have electron = 2
3) neutrons of H = -2(idk about minus) and Li = 3
Ans = B

Q4
Use : P1V1/T1 = P2V2/T2 (convert Celsius to kelvin)

Q31
1) 1 UPE
2) 4 UPE
3) 2 UPE
 
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The Sarcastic Retard

The Sarcastic Retard

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shazmina said:
Brother its coming as unavailable :/
Click to expand...
subsitute the equation for kc of the first reaction into the kc of the second reaction. product changes into reactant so the Kc (2) will be reciprocalled too and become 1/2.
then in the first equation there were 2 mol of X2Y so it was squared in the equation. in the second reaction is is just one so does not need to be squared so square root is taken on both sides of the eq.
It was posted by Daredevil.. :)
 
asadalam

asadalam

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The Sarcastic Retard said:
Q31
1) Both have proton no. = 3
2) both have electron = 2
3) neutrons of H = -2(idk about minus) and Li = 3
Ans = B

Q4
Use : P1V1/T1 = P2V2/T2 (convert Celsius to kelvin)

Q31
1) 1 UPE
2) 4 UPE
3) 2 UPE
Click to expand...
How does Q31 3 have 2 UPE?Doesnt the ion have just 4s2?
 
asadalam

asadalam

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The Sarcastic Retard said:
If u follow chemguide (Tim) then i guess u should have not face this problem.. Well my new school is awesome... was taught this concept at the end of Electronic concepts <3
Click to expand...
I guess it makes sense though,it'll lose from the S shell first as they are paired i guess.
 
The Sarcastic Retard

The Sarcastic Retard

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asadalam This one concept is very tricky to remember... (The first ten transitoin elements)
If u r confident check out 3d 4s concept on chemguide...
PS Only if u r confident that u are good enough to understand it coz it may tangle u...
 
nehaoscar

nehaoscar

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upload_2015-6-8_13-40-5.png
Why not C?
Is there a trick or some solution is solving these questions?
Like the electronegativity values are not in the data booklet so any tips on how to calculate these sort of questions to find the largest or smallest overall dipole?
 
M

mohhef3

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Xtreamer

Xtreamer

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nehaoscar said:
View attachment 54801
Why not C?
Is there a trick or some solution is solving these questions?
Like the electronegativity values are not in the data booklet so any tips on how to calculate these sort of questions to find the largest or smallest overall dipole?
Click to expand...
Just remember that Cl , F, N and O are very electronegative and tend to pull electrons toward themselves much.

It cant be C cuz Cl and O dont have much electronegativity difference so its kinda balanced....in B highly electronegative is only O so thats why
 
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