Biology; Chemistry; Physics: Post your doubts here!

[Anon]

Chemistry is not one of the things I am best at...
And thanks again

 

[SalmanPakRocks]

neither me
np

 

[Anon]

Another prob:

Here is the ques:

 

[SalmanPakRocks]

Another prob:

Here is the ques:

Ok just remember that following reactions are NEVER redox
=> Neutralization (Acid + Base)
=> Ionic precipitate (a solid formed in a reaction)
=> Thermal Decomposition.
So the answer here is C (m i right ?)

 

[Anon]

Right again Salman..

Explain a bit more
This is Ionic precipitate reaction?

 

[SalmanPakRocks]

See u must have done Identifications of Ions for ATP!
If there is a reaction and there is a solid left over than its an Ionic precipitate reaction. It is basically produces Insoluable Compounds!

 

[Anon]

I got it, the salt analysis thing one are the ionic precipitate reaction.

IN which category does the equation in C qualifies?

 

[SalmanPakRocks]

C lies in Neutrilization! See whenever acid reacts with bases then Salt + water is formed!
just by looking at H^2 O u can conclude that its a neutrilization reaction

 

[Anon]

never knew I was sooo pathetic at chem... *sigh*

This one:

I thout it was B,
it isnt !!

 

[Anon]

C lies in Neutrilization! See whenever acid reacts with bases then Salt + water is formed!
just by looking at H^2 O u can conclude that its a neutrilization reaction

understood.

 

[SalmanPakRocks]

CuO is Alkaline metal and H2SO4 is Sulfuric acid!
so when Alkaline react with acid its neutrilization

 

[SalmanPakRocks]

never knew I was sooo pathetic at chem... *sigh*

This one:

I thout it was B,
it isnt !!

I think the answer is A but I m also cofuse about C.

 

[Anon]

Right again Salman
It is A.

I dont get what A means.
And I can assure you, I am more confused then you.

Why isnt it B? Catalyst ofcourse dont take part in reaction!

 

[SalmanPakRocks]

Right again Salman
It is A.

I dont get what A means.
And I can assure you, I am more confused then you.

Why isnt it B? Catalyst ofcourse dont take part in reaction!

see in Chemistry they always confuse candidates by giving 2 options correct but here is our where our reading helps! us! I suggest u read the question again! I agree that catalyst doesn't take part in the reaction but there is also written , "Typical equillibruim reaction".
Well I was also confused about C because of their close tatics

 

[Anon]

Another question

I am putting halt at doing pastpapers. It obviously look, I should better read the books first..

 

[SalmanPakRocks]

Another question

I am putting halt at doing pastpapers. It obviously look, I should better read the books first..

I guess its B because I read it in Preparation Of Ammonia topic. Well I think this one is incorrect. btw which year are u solving??

 

[Anon]

BTW Salman,
What should I do, in Chemistry now?

Read book, or continue with pastpapers? or something else?

 

[Anon]

I am doing

s10_qp_12 (j 2010, )
link: http://www.xtremepapers.com/CIE/Cambrid ... _qp_12.pdf

 

[SalmanPakRocks]

BTW Salman,
What should I do, in Chemistry now?

Read book, or continue with pastpapers? or something else?

Ur concepts aren't clear! see when teacher explains the topic it goes through my head because i hate chemistry! :evil:
anyways I suggest u read the book and solve past papers because by solving topical MCQ clear's the concepts!

 

[Anon]

ANd yes, your answer is right, its B