Biology; Chemistry; Physics: Post your doubts here!

[AhsanAfzal]

Do you even know what is anti matter?

m=E/C^2, maybe.just a guess

 

[papajohn]

6 Which molecule has the largest number of electrons involved in covalent bonds?
A C2H4
B CO2
C CH3OH
D N2

 

[AhsanAfzal]

Yar an paper de k sakun in aya?

abhi bio Mcq rehta hai

 

[usama321]

6 Which molecule has the largest number of electrons involved in covalent bonds?
A C2H4
B CO2
C CH3OH
D N2

A

 

[papajohn]

A

Right but why not Nitrogen triple bond??

 

[Suchal Riaz]

When

m=E/C^2, maybe.just a guess

antimatter and matter meet they annihilate each other and their total mass is converted into energy. It is me to one change to all of the mass is converted. Anti matter and matter was created in equal amount but it has magically disappeared. Total energy produced is calculated by e=mc squared

 

[Suchal Riaz]

Yar an paper de k sakun in aya?

Which question?

 

[usama321]

Right but why not Nitrogen triple bond??

4 electrons in the carbon double bonds
2 electrons for each of the 4 hydrogen, so 8 more

 

[inquisitiveness]

aqueous and dilute are same

no.dilute means has alot of water,aqueous means has water moderately

 

[AhsanAfzal]

Which question?

previous page, by me

 

[usama321]

no.dilute means has alot of water,aqueous means has water moderately

k, Br should have only discharged if it had been a concentrated solution, cuz it is more reactive than OH ion

 

[AhsanAfzal]

k, Br should have only discharged if it had been a concentrated solution, cuz it is more reactive than OH ion

doesnt dilute and aqueous mean same?

 

[usama321]

doesnt dilute and aqueous mean same?

aqueous just means dissolved in water, it does not tell about the concentration
Dilute on the other hand tells that there is more solvent than the solute. Dilute does not necessarily mean that the solvent is water, it can be another solvent too like ethanol

 

[papajohn]

Agree with Usama.

 

[AhsanAfzal]

so whats the answer?

 

[TheStallion-Reborn]

can sum1 please help me with question 6 part c

 

[Suchal Riaz]

I

part b. marking scheme says liquid around anode goes brown. wont there be bubbles of a colourless gas(oxygen from OH-)?

No. It will be brown color of aqueous bromine.
When there are halides and it is not mentioned that it is dilute u will consider that the halide will discharge. usama321

 

[usama321]

I
No. It will be brown color of aqueous bromine.
When there are halides and it is not mentioned that it is dilute u will consider that the halide will discharge. usama321

we will take it as concentrated if it is just written aqueous? I HATE CIE

 

[$$AK$$]

this is the conduction question im talking about...so you saying that the conduction can refer to different things?

which year is this please?

 

[Suchal Riaz]

we will take it as concentrated if it is just written aqueous? I HATE CIE

We only use dilute solutions in electrolysis if we want to separate oxygen and hydrogen. Mostly,