Chemistry: Post your doubts here!

[Hisham Khan]

why b?

 

[Kanekii]

View attachment 63718

Note that except for B, the dipoles for the other 3 options can be viewed as cancelling each other out

why b?
View attachment 64013

 

[A*****]

why b?
View attachment 64013

 

[Tajrina Promela]

Why isn’t the answer A?

 

[Hisham Khan]

Hail bio gth chem even though I might get 50+ in theory I have forgotten most chem and rip mcs lol

 

[khadijaimran]

the ans is B. whats wrong with D?

 

[MARZ132000]

Why isn’t the answer A?View attachment 64015

Because increasing the concentration means that you are increasing the number of collisions, but those collisions can be either successful or not while an increase in the temperature ensures that the number of successful collisions will be more.
Not sure if my explanation is correct, so please correct me if it's wrong.

 

[Tom Sewage]

pls can someone explain how to solve these questions?

 

[Kanekii]

HELP and explain
why is 10 A and 9 B?

 

[Kanekii]

ANS B can anyone explain why it is slower than iodoethane

 

[A*****]

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HELP and explain
why is 10 A and 9 B?

Isn't 9 C??

 

[A*****]

Everyone's just posting...no one is answering

 

[A*****]

View attachment 64023
ANS B can anyone explain why it is slower than iodoethane

C-I bond is weaker so breaks quicker than C-Br

 

[A*****]

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HELP and explain
why is 10 A and 9 B?

Equilibrium constant is only effected by temp...temp is same so it is also same

 

[Hisham Khan]

Can you explain the points?

 

[Kanekii]

Isn't 9 C??

Oh yeah so sorry i checked ms and was A even marked myself wrong silly me​

 

[Kanekii]

Equilibrium constant is only effected by temp...temp is same so it is also same

But it says pressure constant?

 

[Hisham Khan]

help?

 

[Hisham Khan]

I was really good in chem in olevels.Even in A levels now... but I dont know why I just don;'t have a liking for the chem mcs.
bio mcs were intresting needed some thinking.chem is just you know or you don't know thingy

 

[Ebrahim12]

View attachment 64025
help?

Write the equations to get the amount of O2 needed for one mole of each element:

Mg + 1/2 O2 → MgO
Al + 3/4 O2 → 1/2 Al2O3
S8 + 12 O2 → 8SO3

So its 0.5, 0.75, 12.