Chemistry: Post your doubts here!

[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

 

[Metanoia]

View attachment 63816


View attachment 63817

can anyone pls explain me how to solve these two questions

First question was explained in #17975

For the 2nd question,
moles of ethanol = 2.3/46 = 0.05 mol
moles of ethanoic acid expected = 0.05 mol
mass of ethanoic acid expected = 3 g
actual mass obtained = 60% x 3 g = 1.8 g

 

[A*****]

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

But due to difference in electronegativities, it DOES have dipoles...so won't there b pd-pd forces due to the presence of dipoles, despite the fact that it has no dipole moment ?

 

[sukasukinya]

How to do this? Im having paper 1 in 3 days and stressing out right now because of this question:'( Help

 

[A*****]

View attachment 63820
How to do this? Im having paper 1 in 3 days and stressing out right now because of this question:'( Help

I think this is removed from the syllabus