Chemistry: Post your doubts here!

[Nadia Ilyas Sheikh]

If you find the ratio of salt to sulphite( simply by finding moles of salt and sulphite according to the info given) it comes out to be 2:1
& the equation shows 1 mole of sulphite looses 2 electron, therefore 2 mol of metallic salt gain those 2 electrons or 1 mol of metallic salt gains 1 mol of electron
therefore new O.N. of metal = +3-1=+2!

so if metallic salt gains those 2 electrons so why is +3 subtracted by -1 and not with -2.

 

[A*****]

The answer to this is C...although I know that there will be no dipole moment in CO2 but does that also mean that it will not have permanent dipole-dipole interactions?

 

[Metanoia]

View attachment 63773
can someone help me with this question?

The free radical is a chlorine atom.
Statement 1 is wrong as its a homolytic fission

 

[sukasukinya]

I really can't figure this out. How can the formula be like that? Isn't it going to be 2 Ca ? The answer is C btw. Helppp

 

[Kanekii]

View attachment 63791
I really can't figure this out. How can the formula be like that? Isn't it going to be 2 Ca ? The answer is C btw. Helppp

It says salt formation so the ratio of acid to calcium would be 2:1 for example for Butanedioic acid seperate into two parts and react it with calicum and it will look like this :
CH2COO- + Ca2+ = (CH2COO)2 Ca
And do that for the rest and so its formula will become
C8H8O8Ca2
Divide by 2 and so the E.F becomes
C4H4O4Ca

 

[ThePacifics]

pretty stupid question but we are given data booklet in chemistry paper 1 right? we are allowed to use it right

 

[Mts.99]

why is it C and not B?

 

[sukasukinya]

It says salt formation so the ratio of acid to calcium would be 2:1 for example for Butanedioic acid seperate into two parts and react it with calicum and it will look like this :
CH2COO- + Ca2+ = (CH2COO)2 Ca
And do that for the rest and so its formula will become
C8H8O8Ca2
Divide by 2 and so the E.F becomes
C4H4O4Ca

Thank youuuuu

 

[Kanekii]

why is it C and not B?

As the reactants react they produce auto catalyst with the products so the rate increases but later after some time the the rate will decrease due to low substrate concentration.

 

[Mts.99]

As the reactants react they produce auto catalyst with the products so the rate increases but later after some time the the rate will decrease due to low substrate concentration.

is shape of graph B for conc against time for auto-catalytic reaction?

 

[SohaibButt]

View attachment 63778

How to do this one?

 

[Mts.99]

How to do this one?

PV/RT=n where n is moles of CO2 produced..with calculation u ll get n=16
since 2 moles of alkane are producing 16 moles of CO2,
alkane : C02
1 : 8
means alkane has 8 carbons in it

 

[angryrider_56]

Guys check the page @threesciencesforalevel on insta...
You'll be surprised at what you will find. Unfortunately, I just got to see it now :"(

 

[SohaibButt]

PV/RT=n where n is moles of CO2 produced..with calculation u ll get n=16
since 2 moles of alkane are producing 16 moles of CO2,
alkane : C02
1 : 8
means alkane has 8 carbons in it

Thanks

 

[A*****]

Plz someone guide me on how to balance such equations...will be really grateful

 

[A*****]

The answer to this is C...although I know that there will be no dipole moment in CO2 but does that also mean that it will not have permanent dipole-dipole interactions?

Help needed here

 

[khadijaimran]

please help me out with this one. the ans is C

 

[Tom Sewage]

can anyone pls explain me how to solve these two questions

 

[Metanoia]

The answer to this is C...although I know that there will be no dipole moment in CO2 but does that also mean that it will not have permanent dipole-dipole interactions?

CO2 does not have pd-pd interaction as it has no overall dipole moment

 

[Metanoia]

please help me out with this one. the ans is C

Polymerising 1,2- dichloroethene will result in the polymer below



Hydrolysis will replace the Cl atoms with OH